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FOC | Family List | FOC Vol. 19 | Acanthaceae

25. Rhinacanthus Nees in Wallich, Pl. Asiat. Rar. 3: 76, 108. 1832.

灵枝草属 ling zhi cao shu

Authors: Jia-qi Hu & Thomas F. Daniel

Shrubs, subshrubs, or herbs, with cystoliths. Leaves opposite, petiolate or subsessile; leaf blade margin entire or slightly undulate. Inflorescences axillary or terminal, spikes or racemes, sometimes branched into panicles; bracts and bracteoles shorter than calyx. Calyx deeply 5-lobed; lobes subequal. Corolla white or greenish [or purple]; tube cylindric, elongate, narrow; limb 2-lipped; lower lip 3-lobed, lobes ascending cochlear in bud; upper lip entire or 2-cleft, inside rugulose. Stamens 2, exserted from mouth of corolla; anthers 2-thecous; thecae unequally inserted to superposed, lower theca with or without a basal appendage; staminodes absent. Capsule with a solid stalk, clavate, 4-seeded; retinacula present. Seeds discoid, variously ornamented, lacking trichomes.

About 25 species: tropical and subtropical regions of Africa and Asia; two species (one endemic) in China.

Rhinacanthus calcaratus (Wallich) Nees was reported from Yunnan by C. C. Hu (FRPS 70: 268. 2002) based on a misidentification of Pseuderanthemum polyanthum.

1 Leaf blade narrowly obovate to oblanceolate, 20-24 × 6-8 cm, abaxially glabrous, secondary veins 8-10 on each side of midvein; corolla tube ca. 4 cm, lobes of lower lip 2-2.5 cm.   1 R. beesianus
+ Leaf blade elliptic, ovate-elliptic, or rarely lanceolate, 2-7(-11) × 0.8-3 cm, abaxially pubescent, secondary veins 5 or 6 on each side of midvein; corolla tube 1.5-1.8 cm, lobes of lower lip 2-4 mm.   2 R. nasutus

Lower Taxa


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