By Reto F. Dicht, Adrian D. Lüthy
This particular reference paintings provides the 1st finished taxonomy of Coryphantha, with a whole key to the genus. It incorporates a new taxonomic category of all forty three species and eleven subspecies, with morphological and ecological descriptions. those cacti, which develop in Mexico and southern united states, are characterised by way of their general grooved tubercles and big flora.
The ebook is the results of decades of viewing the literature and fieldwork via the writer workforce and their ongoing dedication to map out the nomenclature of this genus. in this approach, the authors even found a few new vegetation.
More than three hundred high quality color pictures exhibiting a number of the cacti and their habitats in addition to distribution playing cards and illustrations explaining the morphological information supplement the textual content. Written in an easy-to-follow variety and with a bankruptcy on cultivation stipulations, the paintings won't merely be a useful reference guide for taxonomists and horticulturalists but additionally for hobbyists and plant creditors.
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Additional resources for Coryphantha: Cacti of Mexico and Southern USA
This direction of groove development can clearly be verified in species with Escobaria areole type, but also with Macromeris and Protocoryphantha areole types (C. poselgeriana, C. robustispina). The development of the Protomammillaria areoletype in which grooves develop after activation of both the areolar and the axillary meristem also remains unexplained, as does the development of the Ortegocactus areoletype with optional groove formation. Postulation of a division of the meristem completely neglects the appearance of extrafloral nectary glands (morphologically honey spines) in the grooves and their continued secretion until the death of the tubercle.
Linné’s generic name Cactus was soon given up, because it included too many species unrelated to each other. M. , to Cactus. With BRITTON and ROSE (1923) only, the generic name Cactus was given up definitely, because it also included Melocactus, a fact which inevitably led to nomenclatural confusion. Coryphantha Instead of Aulacothele During the nineteenth century, while all Coryphantha sp. , LEMAIRE (1839) published the name Mammillaria [tax. 3 The Generic Nasme Coryphantha and the Type Species their upper surface”.
G. Coryphantha clavata ), treatment as an independent subgenus is not justifiable, however, the presence of a unique areole type permits the separation into an independent section. Illustrations: Distribution see Plate 9, map 1; plant portrait see Plate 14, photo 2. B Section Robustispina Dicht & A. Lüthy Cact. Syst. Init. 11: 9, 2001. Type: Coryphantha robustispina (Schott ex Engelmann) Britton & Rose. Definition: Areoles Protocoryphantha type: grooves becoming slowly longer on each newly formed tubercle during the ontogenesis of the individual plant, this process being interrupted for a longer period (years) when the grooves reach about three-quarters of the way to the tubercle axils and incomplete 46 grooves persist on old tubercles, flowering only after attainment of maximum length areolar grooves reaching the axils.