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FOC | Family List | FOC Vol. 19 | Acanthaceae

4. Thunbergia Retzius, Physiogr. Sälsk. Handl. 1(3): 163. 1780.

山牵牛属 shan qian niu shu

Authors: Jia-qi Hu & Thomas F. Daniel

Vines [or shrubs], lacking cystoliths. Leaves petiolate; leaf blade margin entire to lobed to dentate. Flowers solitary or paired in leaf axils, or in terminal dichasiate thyrses, pedunculate; bracteoles leaflike, paired, enclosing calyx and most or all of corolla tube, distinct or fused along one side, persistent. Calyx much shorter than bracteoles, cupular with 10-20 subulate lobes or reduced to an entire ring. Corolla funnel-shaped, large; tube with short cylindric base then widened; limb ± equally 5-lobed. Stamens 4, often didynamous, inserted near base of corolla tube, included; anthers 2-thecous; thecae oblong or ovoid, parallel, spurred or not at base, sometimes bearded. Disk shortly annular or pulvinate. Ovary fleshy; ovules 2 per locule, collateral; style glabrous or pubescent; stigma 2-cleft, entire, or fringed. Capsule basally subglobose, apically prominently beaked, 2-4-seeded; retinacula absent. Seeds compressed to spherical, lacking trichomes.

More than 100 species: Old World tropical regions; six species (one introduced) in China.

Some species of Thunbergia are naturalized in the New World tropics.

Thunbergia erecta (Bentham) T. Anderson and T. laurifolia Lindley, both cultivated in gardens, are not treated here.

1 Calyx reduced to an entire ring   (2)
+ Calyx bearing 10-20 slender subulate lobes   (4)
2 (1) Leaves glabrous.   3 T. eberhardtii
+ Leaves pubescent   (3)
3 (2) Corolla bluish; capsule pubescent.   1 T. grandiflora
+ Corolla red; capsule glabrous.   2 T. coccinea
4 (1) Leaves pinnately veined.   4 T. lutea
+ Leaves palmately 3-5-veined   (5)
5 (4) Petiole conspicuously winged; corolla orange with throat dark purple internally.   5 T. alata
+ Petiole wingless; corolla entirely white.   6 T. fragrans

Lower Taxa


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