Gymnocalycium: A Collector's Guide by John Pilbeam, Bill Weightman

By John Pilbeam, Bill Weightman

The genus "Gymnocalycium" has been well liked by cactus fanciers for a few years. it really is common within the wild, with such a lot species happening in northern Argentina and southern Bolivia, and a handful in southern Brazil, south-western Paraguay and Uruguay. New species or variations of species were came upon gradually because the attractiveness by way of Britton and Rose in 1922 of Karl Pfeiffer's genus "Gymnocalycium", proposed by way of him a few 70 years prior to. the various earliest of cactus illustrations are of species of "Gymnocalycium", then referred to as lower than the umbrella names of ribbed, globular cacti "Echinocactus". this article is meant to teach the collector what the diversity of species is and to aid within the id and verification of received crops, in addition to offering, in a single resource, info spanning a couple of years. during getting ready this paintings, John Pilbeam elevated his choice of this genus from a hundred and twenty vegetation to 800, and has travelled to work out collections around the world.

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A Argemone corymbosa with epicuticular wax. B Berberis trifoliolata with prominent epidermal papillae. C Becium burchellianum, having epidermal papillae. D Stephanomeria pauciflora with a warty surface. Bar 50 ~m ture is much more common and probably more significant to the energy budgets of succulents. 5 Leaf Orientation and Display Erectophily is most commonly observed among desert evergreens. In addition to the examples of Larrea discussed earlier in the chapter, other examples are Mortonia sempervirens and Leucophyllum frutescens of the Chihuahuan Desert, Simmondsia chinensis located along the moister margins of the Sonoran Desert, Salvadora oleifera in the Thar (Sen et al.

Perhaps unexpectedly, E. califarnica Functional Morphology of Nonsucculen t Leaves 34 A B £. larill()sa, green leaf £. larillosa, white leaf ___ 1 --,I, ,, 80 I ",- ,~ £. ca/damica, green leaf ~ '" v 60 c.. c.. c: o ~ 20 c: o ....... larill()sa, white leaf 600 \ 700 Wavelength (nm) \ '- ..... ~ .......... ,... Iarillosa, while leal \\ with trichomes \ 500 ' l-- E. 6A,B. 8 ~m as determined with an Ulbricht integrating sphere. A Green leaves of semiarid coastal Encelia californica, and "green" and "white" leaves of the desert-dwelling E.

Bar 50 ~m ture is much more common and probably more significant to the energy budgets of succulents. 5 Leaf Orientation and Display Erectophily is most commonly observed among desert evergreens. In addition to the examples of Larrea discussed earlier in the chapter, other examples are Mortonia sempervirens and Leucophyllum frutescens of the Chihuahuan Desert, Simmondsia chinensis located along the moister margins of the Sonoran Desert, Salvadora oleifera in the Thar (Sen et al. 1972; Pillai and Pillai 1977), May tenus 40 Functional Morphology of Nonsucculent Leaves polyacantha and Zygophyllum prismatocarpum in the northern Karoo, and Atriplex hymenelytra of washes and alkali sinks, especially in the Mojave Desert.

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