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Cynanchum ellipticum (Harvey) R.A. Dyer, Mem. Bot. Surv. South Africa 17: 138. 1937. Bunburia elliptica Harvey, Gen. S. Afr. Pl. 416. 1838. TYPE: South Africa. Cape: near Grahamstown, Bunbury s.n. (holotype, Herb. Hook. 1867, K).

Plants twining, 1.5--3 m high, richly branched; subterranean organs consisting only of fibrous roots. Shoots perennial, 200--300 cm long, 1--1.5 mm diam., herbaceous, glabrous, basally woody with grayish bark. 'Stipules' ovate, almost round, 4--6 mm long, 4--6 mm wide. Leaves with petioles 5--15 mm long; leaf blades herbaceous, 20--40 mm long, 10--20 mm wide, elliptic to oblong, basally rounded with 2 colleters adaxially, apically obtuse to acute, apiculate, adaxially and abaxially glabrous.

Inflorescences bostrychoid to sciadioidal, 2--15(rarely --30)--flowered, 4--10 flowers open at a time; rachis to 8 mm long; peduncles 12--20 mm long, glabrous. Flowers sweetly scented; floral bracts 0.8--1 mm long, 0.5--0.7 mm wide at the base, triangular, glabrous; pedicels 5--10 mm long, glabrous. Buds 2.5--3.5 mm long, 1.5--2.5 mm diam., ovoid; aestivation imbricate. Calyx basally fused, abaxially glabrous; lobes 0.8--1.2 mm long, 0.4--0.6 mm wide, ovate to oblong, apically obtuse. Corolla rotate, basally fused, spreading to recurved, 2.5--4 mm long, abaxially and adaxially glabrous, brown to green; lobes 0.8--1.2 mm wide, spreading to recurved, cucullate, apically obtuse, straight, or apically twisted. Corona white, cyathiform, 2.5--3.5 mm high, exceeding the gynostegium but not obscuring it, abaxially glabrous; C(is) consisting of Cs and Ci completely fused; upper margin entire or irregularly crenulate. Cs without adaxial appendages. Gynostegium 1--1.4 mm high, 1.2--1.6 mm diam., sessile. Stamens without free filaments, anthers broader than high, trapezoidal, abaxially convex; anther wings 0.5--0.6 mm long, convergent, extending beyond the anther proper forming a basal arch, adjacent anther wings parallel, in the same plane as the anther. Connective appendages 0.35--0.4 mm long, 0.25--0.3 mm wide, triangular, narrower than the stamen, slightly inflexed.

Pollinarium: corpusculum 0.2--0.22 mm long; caudicles 0.15--0.17 mm long, flattened, straight, declinate, thickened at the insertion of the pollinium, trapezoid; pollinia laterally attached to the caudicles, 0.3--0.35 mm long, 0.1--0.12 mm wide, ovate, round in cross section. Stylar head 0.8--0.85 mm diam., 0.7--0.8 mm high; upper part 0.45--0.48 mm high, depressed-conical. Follicles 45--60 mm long, 6--8 mm wide, obclavate, obtusely deltate in cross section, apically strongly beaked, keeled, medium brown, longitudinally slightly grooved, glabrous. Seeds 6--7 mm long, 3.5--4.5 mm wide, pyriform, dark brown, seta and aseta side tuberculate and sculptured with longitudal ridges (less pronouncedly so on the aseta side); margins wingless, entire; coma 25 mm long.

Chromosome number: 2n = 22 (Voucher: Liede 2933, ULM).

Distribution and habitat. Africa: Mozambique, South Africa (Cape Province, Natal, Transvaal); 0--1300 m; flats to moderate slopes, in sand or between rocks, indigenous forests and forest margins, thickets, frequently in disturbed habitats.

Comments: In Liede (1993), this species has been discussed under C. capense Thunb. However, Cynanchum capense L.f., Suppl.: 168. 1782, is interpreted by N.E. Brown (1908) as synonym of Pentatropis microphylla Wight & Arn., because the description is clearly taken from the specimen König s.n., which represents Pentatropis microphylla. The other specimen cited in the protologue (Sparrmann s.n.) represents Cynanchum obtusifolium L.f. Cynanchum capense Thunb., Prodr. Fl. Cap.: 47. 1800 (type: Thunberg s.n. , UPS 6289, UPS) represents a later homonym to Cynanchum capense L.f.

Letzte Änderung Wed, 10 Aug 2011 17:27:44