Bruce Bayer has published many articles and several books on Haworthia.

Many are available from:

Harry Mays
Editor, Alsterworthia International.
e-mail: hmays@freenetname.co.uk

 

Haworthia Handbook (out of print)
National Botanic Gardens of South Africa, Kirstenbosch, Cape, 1976

 

 

The New Haworthia Handbook (out of print)
National Botanic Gardens of South Africa, Karoo Botanic Garden, Worcester, 1982

 

 

Haworthia Revisited. A revision of the Genus. (out of print)
Umdaus Press, Hatfield, South Africa, 1999
Well established, color-illustrated revision of the species. Hard cover. 250 pages 21 x 26 cm.

 

 

Thoughts on Haworthia. Philosophical dissertations. (out of print)
Spiderwalk Services CC, Durbanville, Capetown, South Africa
Soft cover. 99 pages 21 x 29.5cm. 22 papers.
Variety of subjects, ICBN, USA talks, correspondence with taxonomists and others, the enigma of Haworthia etc.

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Since Haworthia Revisited was published Bruce has made many more habitat excursions and is still making them. He has noted geographical features, geology and the wide variability of habitat plants. Many new populations have been discovered and most have been extensively photographed. As time has passed he has written up his discoveries in Updates 1-7, revised his species list as necessary and profusely illustrated populations and their variability. These photos of plants in habitat are a “herbarium” par excellence. The following detail the publications, contents and page numbers.

 

Haworthia Update Essays on Haworthia – Volume 1
Umdaus Press, Hatfield, South Africa, 1999

Foreward, Preface, Acknowledgements, Introduction
Essay 1. Haworthia gracilis, H. cymbiformis and H. cooperi in the greater Baviaanskloof area	1-4
Essay 2. Haworthia mucronata and its new variety	5-24
Essay 3. The case of Haworthia incurvula	25-33
Essay 4. Haworthia cooperi and H. bolusii var. blackbeardiana	34-47
Eassy 5. The Haworthias of Kaboega	48-56
Essay 6. Summation – and a new solution?	57-60
Epilogue	61
References	62

 

Haworthia Update Vol. 2.
Card cover. 165 A4 pages.

Catalyst and consequences	1
Editor’s note	2
Acknowledgement	2
Introduction	3-4
Chapter 1. The curious variability of Haworthia floribunda	4-17
Chapter 2. A population of Haworthia magnifica/maraisii	18-23
Chapter 3. Where to H. limifolia	24-44
Chapter 4. Haworthia limifolia var. arcana Smith & Crouch	45-47
Chapter 5. The White Widow Reunion – Haworthia mutica	48-49
Chapter 6. How to understand H. mutica var. nigra	50-79
Chapter 7. Continuity of Haworthia on the Zuurberg	80-86
Chapter 8. Ecotypes in Haworthia	87-97
Chapter 9. New Names and Combinations in Haworthia	98-104
Chapter 10. Small Hairy Things	105-109
Chapter 11. Some of the interplay of H. arachnoidea and H. mucronata	110-114
Chapter 12. Haworthia rossouwii VPoelln. and the demise of H. serrata Bayer	115-129
Chapter 13. A trip to Bredasdorp	130-135
Chapter 14. Explaining the name Haworthia intermedia VPoelln. and others	136-140
Chapter 15. Electron Scanning Photographs of Haworthia leaf surfaces	141-148
Chapter 16. Nectar Sugars in the Alooid minor genera and a need for another model	149-152
Chapter 17. Species and varieties listed	153-154
Chapter 18. Bayer Accessions	155-162
Index of Scientific Names and Maps	163-165

 

 

Haworthia Update Vol. 3.
Card cover. 167 A4 pages.

Chapter 1. Haworthia mirabilis, and the interface with Haworthia maraisii	1-87
Chapter 2. Flowers of some Haworthias	88-91
Chapter 3. Alooideae – Asphodelaceae and the genera thereof	92-96
Chapter 4. Classification with purpose	97-104
Chapter 5. Something about new Haworthias	105-110
Chapter 6. Review of the annotated checklist for Haworthia – Strelitzia 14	111-113
Chapter 7. Some thoughts on recent literature of the Alooideae (Asphodelaceae)	114-118
Chapter 8. Review of World of Haworthias, Vol. 2	119-122
Chapter 9. A response to Paul Forster’s review of “Haworthia Revisited”	123-127
Chapter 10. “Rocks of Ages” – Another review	128-131
Chapter 11. Haworthia as a problem genus – 34 years on	132-134
Chapter 12. Plant classification – a sociology of ignorance?	135-139
Chapter 13. Haworthia IS confusing	140-156
Chapter 14. A population of Haworthia heidelbergensis	157-161
Chapter 15. The Super Species Proposal	165-167

 

 

Haworthia Update Vol. 4.
Card cover. 108 A4 pages.

Introduction 1
That squadron of Haworthias from Albertinia eastwards	2-28
A glimpse of the super-species H. nortieri	29-60
More new things and ideas in Haworthia	61
Some variation in Haworthia mirabilis var. sublineata	62-77
What did I learn yesterday?	78-79
Credulity stretched	80-82
The brutality of the reality of Haworthia	83-86
Closer to closure	87
Closure	87
Post closure Bruce Bayer	88-91
Appendices (Some relevant older articles which may have escaped the eye.)
Haworthias – small relatives of aloes	92-97
Variation in Haworthia with particular reference to Haworthia glauca	98-101
Haworthia and Nomenclatural Confusion	102-105
Index of scientific names	106-107
About Alsterworthia International	108
Haworthia Study – journal of the Japanese Haworthia Society	108

 

 

Haworthia Update Vol. 5.
Card cover. 199 A4 pages.

Part 1
Chapter 1. Winding down on Haworthia	1-2
Chapter 2. Haworthia Reality Check	3-4
Chapter 3. Haworthia deglamorized. A recapitulation	5-18
Chapter 4. Haworthia retusa	19-38
Chapter 5. Haworthia mirabilis	39-70
Chapter 6. Haworthia floribunda	71-83
Chapter.7. Haworthia minima	84-90
Plant and other colour photographs index	90-91
Part 2
Chapter 8. An extension of H. rossouwii	92-95
Chapter 9. More on H. floribunda and H. mirabilis	96-101
Chapter 10. Haworthia ‘enigma’ and H.. mutica var. nigra	102-128
Chapter 11. What is Haworthia schoemanii?	129-132
Chapter 12. More on H. venosa ‘granulata’	133-138
Chapter 13. A February 2009 miscellany	139-166
Chapter 14. Haworthia jakubii – another new species?	167-169
Chapter 15. A view of Haworthia marumiana ‘dimorpha’	170-181
Chapter 16. New populations of Haworthia chloracantha, H. parksiana and H. kingiana	182-191
Haworthia species list – Bruce Bayer Feb 22nd 2009	192-193
Acknowledgements	194
Plant and other colour photographs index	195-196
Haworthia Study	196
Haworthia Books by Bruce Bayer, Ingo Breuer & Dr. M. Hayashi	197
Alsterworthia International	198-199

 

Haworthia Update Vol. 6.
Card cover. 104 A4 pages.

Introduction	1
Haworthias and Chameleons	2-9
Towerlands. Haworthia retusa ‘turgida’	10-13
Still more about Haworthia on Kaboega	14-22
Haworthia emelyae and some of its variants	23-40
Haworthia emelyae ‘major’ and multifolia. New populations	41-53
Die Nekkies and Biomes and Haworthia maculata	54-67
Taking Haworthia cooperi further – Kliprivier	68-73
A fleeting look at H. arachnoidea	74-86
Interesting nursery plants	87-89
Non-pilose “pilosa”	90-95
North and Northwest of the Potberg	96-100
A look at Aloe haworthioides	101-102
Plant index	103-104

 

 

Haworthia Update Vol. 7.A4 size, printed on A3 paper, folded and stapled.
250 pages in 4 parts. Part 1 has over 330 photos, Part 2 over 280, Part 3 over 330 and Part 4. over 160.

Part 1
Chapter 1 – Haworthia retusa ‘nigra’ – Another grand finale	2-61
Part 2
Chapter 2 – Further exploration in Haworthia. Further to finale	2-29
Chapter 3 – A field trip to the Potberg area	30-83
Part 3
Chapter 4 – What is typical Haworthia mutica?	1-4
Chapter 5 – Still more Haworthia mutica and Haworthia mirabilis	5-23
Chapter 6 – Field trip to Van Reenes Crest and Niekerkshek	24-57
Part 4
Chapter 7 – More on Haworthia mirabilis and H. mutica from east of Bredasdorp	1-29
A rationalization of names in Haworthia, A list of species with new combinations and new synonyms by M.B. Bayer and J.C. Manning.	30-40

 

Haworthia Update Vol. 8.
A4 size, printed on A3 paper, folded and stapled. 68 pages.

Plant Names – a word of warning	iii
Haworthia flowers – some comments as a character source	1
Overview	1
1. The Plants	2-18
2. The Raceme	19-21
3. The Bracts	21
4. The Buds	22-23
5. The Flowers	24-43
6. The Capsules	44-46
7. The Seeds	46-47
Discussion and Conclusion	48-49
Appendix 1 – Haworthia flowers – some comments as a character source	50-55
Appendix 2	56-58
Appendix 3	59-61

 

 

Haworthia Update Vol. 9.

A4 size, printed on A3 paper, folded and stapled. 58 pages.

A myth corrected to Haworthia maculata var. livida (Bayer) Bayer  and flowers ignored	1-51
Conclusion & Acknowledgement	52
My view of names	53-54