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The World of Haworthias
Volume 2

Introduction

Volume 1 presented all the relevant data necessary for original research and the status of the taxa. Volume 2 presents all the descriptions¹ for the Haworthia names and their basionyms.

Original texts have been revised and reorganized after thorough analysis the significance of their content. For ease of reading, and to make possible direct comparison between the entries, the layout has been standardised.

In addition to the revised texts, the text of other authors has been added, especially for older taxa, which mostly have mere Latin phrase names. As many of these texts are unaivailable to the majority of people these days, I have tried to synthesise a complete presentation out of fragmented information.

Descriptions have been published in different countries and languages over a period of more than 200 years. To create a uniform layout, measurements have been converted to metric: plants "mm", distances "km" and altitudes "m". "ø" is used for "diameter" or "across", and "±" is used for "more or less". The different abbreviations for "about" are converted into the full word. The abbreviation "C.B.S." (= Caput Bonei Spei) and the term "SOUTH AFRICA" and analogous terms are interpreted here as "without locality" and the word "CAPE" is used. "§" is substituted for the different representations for "section" and the different abbreviations for "Haworthia" within the texts are simply represented with "H.". The directions "North, East, South and West" are given as "N, E, S and W".

The "English translations" were carried out by Uwe Beyer or myself conform as closely as possible to the original texts.

Italics have been used to make it easier to distinguish quotations from the original texts, and a narrow Italics type has been used for the Latin diagnosis.


New Typification

Although most of the remaining untypified Haworthia names have been typified since Volume 1, there are a further 28 lectotypes (= L), and 16 neotypes (= N) designated here as listed below:

(L)   H. altilinea HAW.
(N)   H. asperula HAW.
(L)   Aloe arachnoidea var. pumila AITON
(L)   Aloe atrovirens DC.
(L)   Catevala atroviridis MEDIK.
(L)   H. brevis HAW.
(L)   H. chloracantha HAW.
(L)   H. concava HAW.
(N)   Aloe cylindracea var. rigida LAM.
(L)   Aloe cymbaefolia SCHRAD.
(L)   Aloe granata var. major SALM-DYCK
(L)   Aloe hebes ROEM. & SCHULT.
(N)   H. herrei var. depauperata POELLN.
(L)   H. laevis HAW.
(L)   H. laetevirens HAW.
(N)   H. limifolia f. diploidea RESENDE
(N)   H. limifolia f. tetraploidea RESENDE
(N)   H. limifolia var. stolonifera RESENDE
(L)   Aloe margaritifera var. major AITON
(L)   Aloe margaritifera var. maxima HAW.
(L)   Aloe margaritifera var. minor AITON
(L)   H. nigra HAW.
(L)   H. pellucens HAW.
(N)   H. planifolia var. poellnitziana RESENDE
(L)   H. planifolia var. setulifera POELLN.
(N)   H. pseudogranulata POELLN.
(L)   Aloe pumila β L.
(L)   Aloe pumila γ L.
(L)   Aloe pumila ε L.
(L)   Aloe radula var. media SALM-DYCK
(L)   H. radula var. pluriperlata HAW.
(N)   H. semiglabrata HAW.
(L)   Aloe semimargaritifera var. maxima SALM-DYCK
(L)   H. setata HAW.
(N)   Aloe stenophylla ROEM. & SCHULT.
(N)   Aloe subrigida ROEM. & SCHULT.
(N)   Aloe subtortuosa ROEM. & SCHULT.
(L)   H. tessellata var. parva f. major J.R. BR.
(L)   Aloe triangularis MEDIK.
(L)   Aloe tricolor HAW.
(N)   H. triebneriana var. pulchra POELLN.
(N)   H. truncata f. tenuis POELLN.
(N)   H. viscosa var. caespitosa POELLN.
(N)   H. viscosa var. subobtusa POELLN.


In 1999 Bayer [1007] designated, among others, 18 neotypes in accordance with the provisions of the ICBN2:

H. bijliana var. joubertii POELLN.
H. cymbiformis var. brevifolia TRIEBNER & POELLN.
H. cymbiformis var. compacta TRIEBNER
H. cymbiformis var. translucens TRIEBNER & POELLN.
H. hurlingii var. ambigua TRIEBNER & POELLN.
H. isabellae POELLN.
H. minima var. major POELLN.
H. pilifera var. dielsiana f. acuminata POELLN.
H. planifolia f. agavoides TRIEBNER & POELLN.
H. planifolia f. robusta TRIEBNER & POELLN.
H. schuldtiana var. unilineata POELLN.
H. setata var. nigricans HAW.
H. stayneri POELLN.
Aloe translucens HAW.
H. triebneriana var. diversicolor TRIEBNER & POELLN.
H. triebneriana var. napierensis TRIEBNER & POELLN.
H. triebneriana var. sublineata POELLN.
H. turgida var. suberecta POELLN.


Since publishing volume 1 in July 1998 several new taxa were described, 3 new species and 31 new varieties, most of did Bayer in [1007]. For all taxa a holotype was cited. The new names are listed below in alphabetically order:

H. angustifolia var. altissima M.B. BAYER
H. arachnoidea var. namaquensis M.B. BAYER
H. arachnoidea var. scabrispina M.B. BAYER
H. blackburniae var. derustensis M.B. BAYER
H. decipiens var. cyanea M.B. BAYER
H. decipiens var. minor M.B. BAYER
H. floribunda var. dentata M.B. BAYER
H. floribunda var. major M.B. BAYER
H. gracilis var. picturata M.B. BAYER
H. gracilis var. viridis M.B. BAYER
H. heidelbergensis var. minor M.B. BAYER
H. heidelbergensis var. scabra M.B. BAYER
H. heidelbergensis var. toonensis M.B. BAYER
H. herbacea var. flaccida M.B. BAYER
H. herbacea var. lupula M.B. BAYER
H. integra var. standeri J.M. ESTERHUIZEN
H. magnificia var. splendens J.D. VENTER & S.A. HAMMER
H. marumiana var. viridis M.B. BAYER
H. mirabilis var. calcarea M.B. BAYER
H. mirabilis var. consanguinea M.B. BAYER
H. monticola var. asema M.B. BAYER
H. mucronata var. rooibergensis J.M. ESTERHUIZEN & L. BATTISTA
H. mutica var. nigra M.B. BAYER
H. outeniquensis M.B. BAYER
H. pubescens var. livida M.B. BAYER
H. pulchella var. globifera M.B. BAYER
H. pungens M.B. BAYER
H. reticulata var. attenuata M.B. BAYER
H. variegata var. hemicrypta M.B. BAYER
H. variegata var. modesta M.B. BAYER
H. variegata var. petrophila M.B. BAYER
H. viscosa ssp. dereki-clarki J.J. HALDA
H. vlokii M.B. BAYER
H. zantneriana var. minor M.B. BAYER


¹ Resende renamed the autonyms of several names (H. coarctata var. coarctata, eilyae var. eilyae, greenii f. greenii, herrei var. herrei and reinwardtii var. reinwardtii) with new names (H. coarctata var. haworthii, eilyae var. poellnitziana, greenii f. bakeri, herrei var. poellnitziana and reinwardtii var. haworthii), but these were illegitimate (ICBN Art. 52.1), because they were superfluous. These descriptions are not included.

² Please notice that Bruce Bayer [1007] designated epitypes for several lectotypes designated by Breuer et al., for example with H. emelyae. This suggests that he considers the lectotypes as ambiguous, because epitypes are designated only when lectotypes are "demonstrably ambiguous". Bayer does not demonstrate ambiguity. The validity of the designated lectotypes by Breuer et al is not effected. Bayer's designation of epitypes appears to shows his interpretation of the taxa are not accordance with the ICBN.

Copyright © 2018, Ingo Breuer