Tylecodon ventricosus
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Illustration from 1738 (Fig. 1) |
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| Tylecodon ventricosus | ||||||||||||
| ( Burm.f. ) Toelken |
Tylecodon ventricosus is a species of the genus Tylecodon in the family of the thick-leaf plants (Crassulaceae).
description
Tylecodon ventricosus grows with very different habitus and little branching as a geophyte or with shoots spread over the earth. The plants reach a height of 16 centimeters and a diameter of 30 centimeters. Tuberous roots are formed, the tubers of which are elongated, spherical and 1.6 to 2 centimeters wide and 2.8 centimeters long. On the shoots there are short to elongated phyllopodia, which taper to a point, are up to 8 millimeters long and are gray-green in color. The rising or spreading leaves are in basal rosettes or close to the shoot tips. They are flat and have little stalk, are 4.5 to 9 inches long and 0.5 to 2 inches wide. The leaf blade is obovate, almost spatulate to linear and lanceolate in shape. They are either bald or covered with a few glandular downy hairs. The upper side of the leaf is flat to furrowed, the underside convex. The leaves are wedge-shaped at the base and have a blunt or pointed tip with an attached tip.
The inflorescence stalks of the 20 to 50 centimeter high inflorescence, which are 5 millimeters in diameter at the base and later taper to 1 millimeter, are covered with glandular hairs. The lower, leaf-like bracts are linear-lanceolate in shape and are 2 to 3 millimeters apart. The upper ones are linear, have curved tips, are 10 to 12 millimeters long and 2 millimeters wide and are 1.5 to 3 centimeters apart. During the flowering period, all bracts fall off. The upright to spread out single flowers are on a 12 to 15 millimeter long peduncle. The tubular corolla, which is 4 millimeters in diameter at the base, is greenish-yellow in color and has purple stripes. It becomes 22 to 25 millimeters long and is bulged in the middle to 7 millimeters. The triangular pointed tips are 7 millimeters long and 2.5 millimeters wide. They are spread out and later bent back.
Systematics and distribution
Tylecodon ventricosus is distributed in South Africa in the provinces of North Cape , Western Cape and Eastern Cape in the Succulent Karoo and in Renosterveld . It was first described in 1768 by Nicolaas Laurens Burman as cotyledon ventricosa . As early as 1738 Johannes Burman published an illustration of the plant as cotyledon ventricosis in his work Rariorum Africanarum Plantarum .
Helmut Richard Tölken placed the species in the genus Tylecodon in 1978 .
Synonyms are Cotyledon ventricosa var. Alpina Harvey and Tylecodon jarmilae Halda .
literature
- E. van Jaarsveld: Tylecodon . In: Urs Eggli (Ed.): Sukkulenten-Lexikon Volume 4 Crassulaceae (Dickblattgewächse) Ulmer, Stuttgart 2003, ISBN 3-8001-3998-7 , p. 380.
Individual evidence
- ↑ Flora Indica: cui accedit series zoophytorum Indicorum, nec non prodromus florae Capensis. P. 13, Amsterdam 1768 ( online ).
- ^ Helmut Richard Tölken: New taxa and new combinations in Cotyledon and allied genera . In: Bothalia . Volume 12, Issue 3, p. 382, 1978 ( PDF ).
Web links
- Photo of a plant at operationwildflower.org.za