Brachystelma tuberosum
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Brachystelma tuberosum |
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| ( Sea ) R.Br. ex Sims |
Brachystelma tuberosum is a species of plant from the subfamily of the asclepiadoideae (Asclepiadoideae). It isnative tosouthwestern South Africa.
description
Vegetative characteristics
Brachystelma tuberosum is a perennial herbaceous plant . This geophyte forms a flattened, spherical root tuber with a diameter of 6 to 15 cm, as a permanent organ. Annual, herbaceous, more or less upright, 40 to 100 cm high, shoot axes that do not branch much and are more or less hairy grow from this tuber .
The leaves are short stalked. The simple leaf blade is lanceolate with a length of 15 to 30 mm and a width of 7 to 10 mm. Shoot axes and leaves die off completely in the dry season .
Inflorescence and flower
The sessile to very short stalked inflorescence contains two to eight flowers. The 10 to 25 mm long flower stalks are hairy downy.
The hermaphrodite flowers are radially symmetrical and five-fold. The flower smells intensely of human faeces . The five hairy sepals are lanceolate with a length of about 4 mm. The relatively large corolla with a diameter of 45 to 95 mm is greenish with purple spots on the outside and purple on the inside. The corolla tube is cup-shaped with a diameter of 5 mm and a depth of 4 mm and is yellowish on the inside with purple spots. The five petals are ovate to lanceolate, with strongly elongated tips. The edges of the petal lobes are curved outward and hairy and the upper ends are greenish in color. The sessile corolla is fused with a basal shell. The interstaminal lobes of the secondary corolla are approximately square and pocket-shaped with triangular to U-shaped upper ends. The interstaminal minor corolla lobes are fused on the side with the base of the staminal minor corolla tips. The staminal corolla lobes are about 1 mm long, tongue-shaped and lie on the stamens .
distribution
Brachystelma tuberosum grows in the southwest of South Africa .
Systematics and taxonomy
This species was first published and illustrated in 1789 by Nicolaas Meerburgh in the very rare (so far not digitized) work Plantae rariores vivis coloribus depictae under the basionym Stapelia tuberosa . The specimen on plate 54, Fig. 1 was determined to be the lecto / iconotype. The first more extensive and detailed description, however, comes from John Sims, based on a manuscript by Robert Brown in Volume 49 of Curtis's Botanical Magazine , on plate 2343 (with two pages of description on unnumbered sheets). He transferred them to his newly proposed genus Brachystelma ; it is the type species of this genus. Ulrich Meve lists the following synonyms for Brachystelma tuberosum (Meerb.) R.Br. in the succulent lexicon . ex Sims on: Stapelia caudata Thunb. (= Brachystelma caudatum (Thunb.) NEBr. ), Brachystelma spathulatum Lindl. Graham , Brachystelma crispum .
swell
literature
- Ulrich Meve: Brachystelma . In: Focke Albers, Ulli Meve (Ed.): Succulent Lexicon Volume 3 Asclepiadaceae (silk plants) . Pp. 17–43, Eugen Ulmer Verlag, Stuttgart 2002. ISBN 3-8001-3982-0
- Nicholas Edward Brown: Asclepiadaceae. In: William T. Thiselton-Dyer (Ed.): Flora Capensis: being a systematic description of the plants of the Cape Colony, Caffraria and Port Natal (and neighboring territories). Vol.4, Sect.1 Vaccinaceae to Gentianeae. London, Reeve, 1905-09 online at Botanicus.org (description of Brachystelma tuberosum on p. 841/2)
Individual evidence
- ↑ Curtis's botanical magazine, or, flower-garden displayed, Volume 49: p.2343, online at Botanicus.org (description, plate 2343, + 2 unnumbered pages)
- ↑ Nicolaas Meerburgh: Plantae rariores vivis coloribus depictae. Lugduni Batavorum / Leyden 1789
