1880.A synopsis of Aloineae and Yuccoideae. Journal of the Linnean Society 18:148.
1896.Haworthia Duval. In: Flora Capensis 6:333.
1942.Plantae novae africanae, Series 18. Journal of South African Botany 8:246.
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1962.A new variety of Haworthia limifolia from Natal. Journal of South African Botany 28:215.
1970.Haworthia as a problem genus. Cactus and Succulent Journal (U.S.) 42:25
1971.Changes in the genus Haworthia Duval. ibid. 43:157.
1971.Haworthias in the Robertson Karoo ‑ South Africa. Journal of the Cactus and Succulent Society of New South Wales 8:9.
1972.Anguish among the Haworthias. Cactus and Succulent Journal of Great Britain.
1972.Natural variation and species delimitation in Haworthia Duv. Part 1. Haworthia reticulata Haw. National Cactus and Succulent Journal 27:10.
1972.do. Part 2. H. herbacea (Miller) Stearn. ibid. 27:51.
1972.A new species of Haworthia (Liliaceae). Journal of South African Botany 38:125.
1972.Reinstatement of the genera Astroloba and Poellnitzia (Liliaceae ‑ Aloineae). National Cactus and Succulent Journal 27:77.
1973.Leaf spirals in Haworthia. Aloe 11:31.
1973.Two new species of Haworthia (Liliaceae). Journal of South African Botany 39:249.
1973.Natural variation and species delimitation in Haworthia Duv. Part 3. H. reinwardtii Haw. and H. coarctata Haw. National Cactus and Succulent Journal 28:80.
1974.Haworthia Duv.: Section Retusae fide Scott ‑ Additional comment. Aloe 12:89.
1974.Haworthia ‑ small relatives of Aloe. Excelsa 4:17.
1974.New Haworthias. Cactus and Succulent Journal (U.S.) 42:75.
1975.The retuse Haworthias. Excelsa 5:83.
1976.Haworthia Handbook. National Botanic Gardens of South Africa, Kirstenbosch.
1977.Corrections to Haworthia Handbook. National Cactus and Succulent Journal 32:18.
1977.Haworthia mirabilis Haw. Excelsa 7:37.
1978.Reflections on G.G. Smith’s Haworthia collection: 1. H. retusa (L.)Duv.: 2. H. mutica Haw. ibid. 8:46.
1979.Natural variation and species delimitation in Haworthia Duv. Part 4. Haworthia emelyae V. Poelln. and a new variety. National Cactus and Succulent Journal 34:28.
1980.Looking for Haworthias. Calandrinia :57. Succulent publications of South Australia.
1980.A story of Haworthia nitidula V.Poelln. (= H. mirabilis Haw.). Cactus and Succulent Journal (U.S.) 52:10.
1981.Three new species of Haworthia. Journal of South African Botany 47:789.
1981.Natural variation and species delimitation in Haworthia Duv. Part 5. Haworthia angustifolia V. Poelln. National Cactus and Succulent Journal 37:31
1982.Observations on the G.G.Smith collection of Haworthia. National Cactus and Succulent Journal (Great Britain) 37:105.
1983.New Haworthia Handbook. National Botanic Gardens of South Africa, Kirstenbosch.
1986.Haworthia and nomenclatural confusion. British Cactus and Succulent Journal 4:8.
1986. Haworthia – confusion reigns again. Excelsa 12:91.
1987.Natural variation and species delimitation in Haworthia Duv. Part 6. Haworthia maculata (V. Poelln.) Bayer. British Cactus and Succulent Journal 5:13.
BAYER, M.B. and PlLBEAM, J.W.
1974.Name changes in Haworthia concerning H. obtusa Haw. and H. pilifera Bak. Cactus and Succulent Journal (U.S.) 46:166.
BERGER, A.
1908.Liliaceae‑Asphodeloideae‑Aloineae. In: Engler, A., Das Pflanzenreich N (Heft 33):74.
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1991.A nurse-patient association: Hypodiscus and Haworthia. Aloe 28:90.
BRANDHAM, P.E.
1969.Chromosome behaviour in the Aloineae: i. The nature and significance of E‑type bridges. Chromosoma (Berl.) 27:201.
1969.do. ii. The frequency of interchange heterozygosity. ibid. 27:216.
1970.do. iii. Correlations between spontaneous chromatid and subchromatid aberrations. ibid. 31:1.
1971.The chromosomes of the Liliaceae. Kew Bulletin 25:381.
1974.Interchange and inversion polymorphism among populations of Haworthia reinwardtii var. chalumnensis. Chromosoma (Berl.) 47:85.
BRANDHAM, P.E. and CUTLER, D.F.
1981.Polyploidy, chromosome interchange and leaf surface anatomy as indicators of relationships within Haworthia section Coarctatae Baker (Liliaceae‑ Aloineae). Journal of South African Botany 47:507.
BRANDHAM, P.E. and JOHNSON, M.A.T.
1977.Population cytology of structural and numerical chromosome variants in the Aloineae (Liliaceae). Plant Systematics and Evolution 128:105.
BROWN, J.R.
1934-Notes on Haworthias. Desert Plant Life (1934‑37, 1946).
1937.Notes on Haworthias. Cactus and Succulent Journal (U.S.) (1937‑1965?).
1957.A brief review of the genus Haworthia. ibid. 29:129.
CHINNAPPA, C.C. and SEMPLE, C.C.
1976.Chromosome aberrations in a diploid Haworthia subfasciata. Canadian Journal of Genetics and Cytology. 18:281.
CRAIB, C.
1990.Some rare Haworthias in South Africa. Aloe 27:23.
CUMMING, D.
1987.The affinities of Haworthia bruynsii. Bayer. British Cactus and Succulent Journal 5:3.
CUTLER, D.F.
1978.The significance of variability in epidermal cell wall patterns of Haworthia reinwardtii var. chalumnensis (Liliaceae). Revista Brazileira de Botanica 1:25.
1979.Leaf surface studies in Aloe and Haworthia species (Liliaceae); taxonomic implications. Tropische und Subtropische Pflanzenwelt 28:447.
1985.Haworthia spp. (Liliaceae) with window leaves: SEM studies of leaf surface adaptations. Parodiana 3:203.
DODSON,J.W.
1946.Haworthia Review. The Succulent Liliaceae League of America. 1 & 2.
DUVAL, H.A.
1809.Plantaesucculentae in Horto alenconio. (see W.T. Stearn, The Cactus Journal 8:105, 1939).
DYER, R.A.
1937.A note on the occurrence of vivipary in Haworthia truncata Schonl. South African Journal of Science 33:335.
ESTERHUIZEN, J.M.
1992.Some notes on Haworthia magnifica V.Poelln. var. magnifica and Haworthia magnifica var. atrofusca (G.G.Smith) Bayer. Aloe 29:
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1996.More notes on Haworthia heidelbergensis G.G.Smith as well as Haworthia magnifica V.Poelln. var. magnifica and Haworthia magnifica var. atrofusca (G.G.Smith) Bayer. Aloe 33:15.
FEARN, B.
1966.Windowed Haworthias. National Cactus and Succulent Journal 21:28.
FOURCADE, H.G.
1932.Contributions to the flora of the Knysna and neighbouring divisions (H. monticola). Transactions of the Royal Society of South Africa 21:78.
HAWORTH, A.H.
1804.A new arrangement of the genus Aloe. Transactions of the Linnean Society 7:1.
1812.Synopsis plantarum succulentarum.
1819.Supplementum plantarum succulentarum.
1821.Revisiones plantarum succulentarum.
1824.Second decade of new succulent plants. Philosophical Magazine and Journal 44:300.
1825.Fifth decade of new succulent plants. ibid. 46:280.
1827.Description of new succulent plants. ibid. 7:123.
1827.Description of new succulent plants. ibid. 2:346.
1828.Description of new succulent plants. ibid. 3:186.
HAYASHI, M.
1987.Callus characteristics and classification of Haworthia and allied species. Journal of South African Botany 53:411.
HUTCHINSON, P.C.
1951.Studies in the genus Haworthia Duval :1. Vegetative variation in the section Fenestratae V.Poelln. Cactus and Succulent Journal (U.S.) 23:99.
JACOBSEN, H.
1951.Haworthia Duval: Review of sections and species. Sukkulentenkunde 4:97.
1965.The genus Haworthia Duval. Kakteen und andere Sukkulenten 3:7.
KAUL, K. and SABHARWAL, P.S.
1972.Morphogenetic studies on Haworthia: Establishment of tissue culture and control of differentiation. American Journal of Botany 59:377.
1975.Morphogenetic studies on Haworthia: Effects of inositol on growth and differentiation. ibid. 62:655.
MAJUMDAR, S.K.
1970.Production of plantlets from the ovary wall of H. turgida var. pallidifolia. Planta 90:212.
1970.Culture of Haworthia inflorescences in vitro. Journal of South African Botany 36:63.
1979.In vitro culture of flower buds of Haworthia and Astroloba. Phyton 27:31.
MAJUMDAR, S.K. and RILEY, H.P.
1967.Chromosomal alteration in relation to speciation in Haworthia. Advancing Frontiers of Plant Sciences 18:63.
1970.Pollen conditions in Haworthia species and hybrids. American Journal of Botany 57:742.
1973.Chromosome numbers, pollen fertility and pollen size in Haworthia species and hybrids. Canadian Journal of Botany 51:1753.
MAJUMDAR, S.K. and SABHARWAL, P.S
1968.Induction of vegetative buds on inflorescence of Haworthia in vitro. American Journal of Botany 55:705.
MAJUMDAR, S.K. and SCHOLOSSER, S.A.
1972.Morphological and histological studies of the effects of sodium cyclamate on Haworthia callus in vitro. Canadian Journal of Botany 50:1013.
MAJUMDAR, S.K. and SULLENDER, J.S.
1977.The fine structure of 2,4‑D induced tumor cells of Haworthia variegata. Phyton 35:145.
MARX, GERHARD.
1996. Mixed windows in the wild. Aloe 33:18.
MOTOHASHI, T., KANOH, K., HAYASHI, M. AND KONDO, N.
1985Relationships between polyploidy and geographical distribution in the genus Haworthia (Liliaceae-Aloineae). Science Report 2:87, Res. Instit. Evol. Biology, Tokyo.
PILBEAM, J.W.
1969.Haworthia tortuosa. National Cactus and Succulent Journal 24:41.
1970.The first fifty Haworthias. The Succulent Plant Institute, England.
1971.Haworthia reinwardtii (S.D.)Haworth. National Cactus and Succulent Journal 26:54.
1971.Haworthia reinwardtii (supplement). ibid. 26:77.
1971.Haworthia viscosa. ibid. 24:56.
1975.The second fifty Haworthias. The Succulent Plant Trust, England.
1978.Haworthia and Astroloba – a collectors guide.
RESENDE, FLAVIO.
1940.Haworthia marlothiana Marloth. Feddes Repertorium specierum novarum regni vegetabilis 48:114.
1940.Haworthia limifolia Marloth fa. marlothiana. Boletim da sociedade Broteriana 14:200.
1943.Succulentas africana 3. Memorias da sociedada Broteriana. 2:94
1946.Variability and taxonomy in the genus Haworthia. Portugalia acta biologica B :1.
RESENDE, FLAVIO and PINTO_LOPES, J.
1946.4. Contribution to a better geno-sistematic knowledge of the Coarctatae section of the genus Haworthia Duval. Portugalia acta biologica B 2:175.
RESENDE, FLAVIO and VON POELLNITZ, K.
1949. Variedades novas da Haworthia tessellata Haw. Broteria 11:49.
RESENDE, FLAVIO and ANTONIO, VIVEIROS.
1948.Caryological studies in the Aloinae. Portugalia acta biologica A 2:176.
RILEY, H.P.
1959.Polyploidy in Gasteria and Haworthia. Bulletin of the Torrey Botanical Club 86:81.
1968.Chromosomal interchanges and evolution in the Aloineae. In: Seminar on Chromosomes.
RILEY, H.P. and MUKERJEE, D
1962.Two aneuploid plants of Haworthia. Journal of Heredity 53:105.
1965.Some new chromosome studies in the Coarctatae and other sections of Haworthia. The Nucleus 8: 149.
RILEY, H.P. and ISBELL, C.J.
1963.Paper chromatographic studies in the Aloineae: 1. Preliminary observations on some species of Haworthia. Journal of South African Botany 29:59.
RILEY, H.P. and HOPKINS, J.D.
1964.Paper chromatographic studies in the Aloineae: 2. The Rigidae and Retusae sections of Haworthia. In: C.A. Leone, Taxonomic Biochemistry and Serology. Ronald Press, :255.
RILEY, H.P. and MAJUMDAR, S.K.
1965.Some polyploid plants of Haworthia. Canadian Journal of Genetics and Cytology 7:357.
1966.Chromosome studies of diploid and polyploid plants of Haworthia. Botanical Gazette 127:239.
1966.Cytogenetic studies of an aneuploid species of Haworthia with special reference to its origin. Journal of Cytology and Genetics. 1:46.
1966.Some further chromosome studies in Haworthia. American Journal of Botany 52:626.
1967.Heterochromatic segments in Haworthia and Gasteria at low temperature. Journal of Heredity 58:297.
1968.Three new chromosomal translocations in Haworthia. Canadian Journal of Genetics 10:487.
1980.The Aloineae. A biosystematic survey. University Press of Kentucky, Lexington.
RILEY, H.P., MAJUMDAR, S.K. and HAMMACK, R.E.
1966.A chromosome translocation in three Haworthia plants. Bulletin of the Association of Southeastern Biologists 13:45.
1967.Chromosomal translocations in three plants of the genus Haworthia. Canadian Journal of Genetics and Cytology 9:683.
1969.Meiosis in a triploid Haworthia with a chromosomal translocation. Journal of Heredity 60:255.
(Voucher specimens supporting most of Prof. Riley’s published chromosome counts are deposited in the Compton herbarium (NBI) at Kirstenbosch.)
ROBERTS, MEL.
1983.The genus Haworthia Duval: past and present. British Cactus and Succulent Journal 1:30.
ROWLEY, G.D.
1967.A numerical survey of the genera of Aloineae. Natn.Cactus Succul.J. 22:71
1976.Generic concepts in the Aloineae. Part 1. National Cactus and Succulent Journal 31:31. Part 2. Idem. 31:54.
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1817.Catalogue raisonne des Especes d ‘Aloes (see W.T. Stearn, The Cactus Journal 7:34, 1938).
1820.Observations botanicae (1820‑22).
1822.Index Plantarum succulentarum in Horto Dyckensi (1822 and 1829).
1834.Hortus Dyckensis.
1836.Monographia generum Aloes et Mesembryanthemi (1836‑42, 1849‑63).
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1910.On some points in the morphology and biology of a new species of Haworthia (H. truncata). Transactions of the Royal Society of South Africa. 1:391.
SCOTT, C.L.
1965.A new species of Haworthia. Journal of South African Botany 31:123.
1967.Haworthia maughanii V.Poelln. Cactus and Succulent Journal of Great Britain 29:26.
1968.A new species of Haworthia. Journal of South African Botany 34:1.
1970.A new species of Haworthia from the Eastern Cape. ibid. 36:287.
1973.A revision of the genus Haworthia, section Retusae. Aloe 11:8.
1976.The identity of Haworthia cymbiformis var. obtusa (Haw.) Baker and Haworthia pilifera Baker. Cactus and Succulent Journal (U.S.) 48:260.
1977.The identity of Haworthia arachnoidea (L.) Duval. ibid. 49:205.
1978.The correct application of the name Haworthia pumila (L.) Duval. Aloe 16:44.
1978.The identity of Haworthia arachnoidea (L.) Duval. ibid. 16:41.
1978.The reinstatement of relegated Haworthia species. Cactus and Succulent Journal (U.S.) 50:74.
1979.Haworthia altilinea Haw. National Cactus and Succulent Journal 34:53.
1979.A new species of Haworthia. Cactus and Succulent Journal (U.S.) 51:268.
1980.Diversity in the species Haworthia scabra Haw., and H. tuberculata V.Poelln. ibid. 52:274.
1980.Haworthia aristata Haw. National Cactus and Succulent Journal 35:11.
1980.Haworthia pearsonii C.H. Wright. Aloe 18:7.
1981.Haworthia reinwardtii Haw. National Cactus and Succulent Journal 36:36.
1981.Haworthia viscosa (L.) Duval. National Cactus and Succulent Journal 36:98.
1981.Some species of Haworthia in the Eastern Cape Province. Cactus and Succulent Journal (U.S.) 53:70.
1981.A new variety of Haworthia. ibid. 53:124.
1983.Haworthia mucronata Haw. British Cactus and Succulent Journal 1:97.
1984.A new species of Haworthia (Liliaceae – Aloineae) sect. -Retusae. Cactus and Succulent Journal (U.S.) 56:69.
1985.The Genus Haworthia, a taxonomic revision. Aloe Books.
1994.A new species of Haworthia, H. reddii. Cactus and Succulent Journal (U.S.) 66:182.
1994.A new species of Haworthia (Asphodelaceae) – H.pringlei. Bradleya 12:102.
1995.A new species of Haworthia (Asphodelaceae) – H.joeyae. Bradleya 13:80.
SCHNEIDER, Christel
1972.Anatomische Untersuchungen an den Blattern einiger Arten von Haworthia. A thesis for Botanical Institute, University of the Saarland.
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1972?Methods and techniques in micropropagation of Haworthia by tissue culture. A thesis for Louisiana State University and Agricultural College.
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1989.Notes on Haworthia glabrata (Salm-Dyck) Baker. Aloe 26:18.
1990.Haworthia fasciata (Willd.) Haw. forma fasciata. Aloe 27:92.
1991.Populations of Haworthia fasciata are dwindling in urban Port Elizabeth, Eastern Cape, South Africa. British Cactus and Succulent Journal 9:42.
SMITH, G.F. and GREYLING, H.P.
1990.Neotypification of Aloe glabrata, basionym of Haworthia glabrata (Asphodelaceae: Alooideae). Taxon 39:331.
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1943.Some new species and varieties in the genus Haworthia: I. Journal of South African Botany 9:93.
1944. do. II and III. ibid. 10:137.
1945.do. IV. ibid. 11:65.
1946.do. V. ibid. 12: 1.
1948.do. VI. ibid. 14:41.
1948.Views on the naming of Haworthias. ibid. 14:55.
1950.Some transfers in the genus Haworthia. ibid. 16:1.
1950.Some new species and varieties in the genus Haworthia: VII. ibid. 16:3.
1950.A reply to Mr. Uitewaal. Cactus and Succulent Journal of Great Britain 12:64.
STEARN, W. T.
1938.An annotated index to Salm-Dyck’s Monographia Generum Aloes et Mesembryanthema. Cactus Journ.(GB) 7.:40.
1939.Plantae succulentae, in Hort Alenconia. Auctora H.A.Duval. ibid. 8:105.
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1993.Did Scott typify names in Haworthia (Asphodelaceae: Alooideae)? Taxon 42:91.
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1985.A choice of name: Haworthia margaritifera or Haworthia pumila. British Cactus and Succulent Journal. 3:88.
TRIEBNER, W. and VON POELLNITZ, K.
1938.Haworthia planifolia Haw., Haworthia cymbiformis Haw. and Haworthia altilinea Haw. Feddes Repertorium specierum novarum regni vegetabilis 45:161.
1938. Haworthia triebneriana V.Poelln. ibid. 47:8.
UITEWAAL, A.J.A.
1938.Haworthia albicans and its varieties. Succulenta 20:140.
1939.A change of name for reasons of priority in the genus Haworthia. ibid. 21:40.
1939.Haworthia luteorosea Uitew. spec. nov. Cactussen en Vetplanten 5:88.
1939.Historical notes of the Aloineae. Succulenta ?:?.
1939.One new species of the genus Haworthia. Cactussen en Vetplanten 5:137.
1940.Haworthia marumiana Uitew. spec. nov. ibid. 6:33.
1940.Two known but undescribed Haworthias. ibid. 6:44.
1947.A first attempt to subdivide the genus Haworthia, based on floral characters. Desert Plant Life 19:133.
1947.Revision of the nomenclature of the genera Haworthia and Apicra. Succulenta 26: 51-54.
1948.Revision of the nomenclature of a few Haworthias II. ibid. ?:49.
1949.Views on the classification of Haworthias. Cactus and Succulent Journal of Great Britain 11:19.
1951.Today’s knowledge about the small‑flowering Aloineae. Sukkulentenkunde 4:91.
VENTER, J.D. and HAMMER, S.A.
1997.New and old species of Haworthia Duval from the Little Karoo. Cactus and Succulent Journal (U.S.) 69:75.
VON POELLNITZ, Karl
1929.Contribution to the knowledge of the genera Haworthia Duv. and Gasteria Duv. Feddes Repertorium specierum novarum regni vegetabilis 27:132.
1929.Haworthia schmidtiana V.Poelln. spec. nov. ibid. 26:23.
1930.Contribution to the knowledge of the genera Haworthia Duv. and Gasteria Duv. ibid. 25:101.
1932.do. ibid. 31:82.
1933.Haworthia starkiana V.Poelln. spec. nov. ibid. 33:73.
1933.Three new Haworthia species. ibid. 33:239.
1935.One new Haworthia species: H. maraisii. ibid. 38:194.
1936.Contribution to the knowledge of the genus Haworthia Duv. ibid. 40:148.
1936.Key to the genus Haworthia Duval. The Cactus Journal 5:28.
1936.New Haworthia species. Kakteenkunde 10:89.
1937.Contribution to the knowledge of the genus Haworthia Duv. Feddes Repertorium specierum novarum regni vegetabilis 41:193.
1937.Four new species of Haworthia. ibid. 42:269.
1937.Five little known species of the genus Haworthia Duval. Desert Plant Life 9:90.
1937.Four little known South African succulent plants. ibid. ?:33.
1937. Four new Haworthia species. Kakteenkunde 10:152.
1937.Haworthia attenuata Haw. Kakteen und andere Sukkulenten 10:165.
1937.Haworthia schmidtiana and related forms. ibid. 10: 168.
1937.New species and varieties of the genus Haworthia Duval. The Cactus Journal 6:18.
1937.New species in the genus Haworthia Duval. Kakteenkunde 9:132.
1937.Six new species of Haworthia Duval. Desert Plant Life 9:100.
1938.Concerning the sections in the genus Haworthia Duv. Feddes Repertorium specierum novarum regni vegetabilis 44:200.
1938.Contribution to the knowledge of the genus Haworthia Duv. ibid. 43:92.
1938.Haworthia Duv.: Scabrae Berger, Retusae Haw. and Coarctatae Berger. ibid. 43:98.
1938.Haworthia fasciata (Willd.) Haw. and related forms. ibid. 43:94.
1938.Haworthia fasciata (Willd.) Haw. The Cactus Journal 6:?.
1938.Haworthia planifolia Haw. and Haworthia perplexa V.Poelln. Kakteenkunde 53-54 cont. Kakteenkunde 6:67.
1938.Haworthia tuberculata V.Poelln and its varieties. The Cactus Journal 7:56-57
1938.Haworthia woolleyii V.Poelln. ibid. 7:3..
1938.Four new species of Haworthia Duval. Desert Plant Life 11:192.
1938.New forms in the genus Haworthia Duv. Feddes Repertorium specierum novarum regni vegetabilis 44:132.
1938.Two new species of Haworthia Duv. Kakteenkunde 7:75.
1939.A new species of Haworthia. Cactussen en Vetplanten 5:115.
1939.Three new forms of the genus Haworthia Duval. Desert Plant Life 2:8.
1939.Two unusual Haworthia species. Beitrage zur Sukkulentenkunde und ‑Pflege 1:45.
1939.Two new Haworthia species. Feddes Repertorium specierum novarum regni vegetabilis 46:271.
1940.Concerning Haworthia Duval. ibid. 49:23.
1940.Two new Haworthia species. ibid. 49:57.
1940.Haworthia reinwardtii Haw. Beitrage zur Sukkulentenkunde und ‑Pflege 2:41.
VOSA, C. and BAYER, M.B.
1981.Chromosome studies in the South African Flora: 10-21. Journal of South African Botany 47:687.
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WESSELS, D.C.J., GROENEWALD, E.G. and KOELEMAN, A.
1976.Callus formation and subsequent shoot and root development from leaf tissue of Haworthia planifolia cf. var. setulifera V.Poelln. Zeitschrift fur Pflanzenphysiologie 78:141.
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1937.Interesting African leaf succulents. Kakteen und andere Sukkulenten 10:170.
1942.do. Beitrage zur Sukkulentenkunde und ‑Pflege 1:13.
1947.Interesting leaf succulents. Sukkulentenkunde 1:40.
1951.Rare, interesting Haworthia species. ibid. 4:94.
WIJNANDS, D.O.
1984.Haworthia margaritifera (L.) Haw. niet Haworthia pumila (L.) Duval. Succulenta 10:230.
WHICHER, PAUL,
1993.Problems of synonymy in the genus Haworthia. British Cactus and Succulent Journal 11:12.
ZANTNER, A. and VON POELLNITZ, K.
1938.One new Haworthia species. Feddes Repertorium specierum novarum regni vegetabilis 43:232.