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FOC | Family List | FOC Vol. 19 | Acanthaceae

15. Pseuderanthemum Radlkofer, Sitzungsber. Math.-Phys. Cl. Königl. Bayer. Akad. Wiss. München. 13: 282. 1883.

山壳骨属 shan ke gu shu

Authors: Jia-qi Hu & Thomas F. Daniel

Herbs or shrubs, with cystoliths. Leaves sessile or petiolate; leaf blade margin entire or subentire [or lobed]. Flowers in axillary or terminal thyrses, racemes, or spikes; bracts and bracteoles present, mostly shorter than calyx. Calyx deeply 5-lobed; lobes equal to subequal. Corolla salverform; tube slender, not or scarcely apically enlarged; limb 5-lobed or 2-liped; lobes ± equal or 3 of lower lip slightly larger than 2 of upper lip, ascending cochlear in bud. Stamens 2, included in corolla tube or exserted from corolla mouth (some species heterostylous); anthers 2-thecous; thecae equal to subequal, parallel, inserted at same height, muticous; staminodes 2 or absent. Style included or exserted; stigma 2-lobed, lobes equal. Capsule clavate with a long solid stalk, 4-seeded; retinacula present. Seeds lenticular, ornamented or smooth, lacking trichomes.

About 50 species: pantropical; seven species (two endemic) in China.

1 Flowers in thyrses, imbricate on rachis   (2)
+ Flowers in racemes (thyrses in P. coudercii), distant on rachis   (4)
2 (1) Calyx lobes pubescent with gland-tipped trichomes.   1 P. polyanthum
+ Calyx lobes pubescent with non-glandular trichomes   (3)
3 (2) Bracts ca. 7 mm; ovary pubescent; leaf blade 5-15 cm.   2 P. crenulatum
+ Bracts ca. 3 mm; ovary glabrous; leaf blade 2.5-5.5 cm.   3 P. shweliense
4 (1) Racemes terminal or axillary.   4 P. teysmannii
+ Racemes terminal only (or terminal and also rarely in apical leaf axils in P. haikangense)   (5)
5 (4) Leaf blade lanceolate, length greater than 4 × width; filaments of fertile and sterile stamens connate at base.   5 P. coudercii
+ Leaf blade elliptic-ovate or elliptic, length less than 3.5 × width; filaments of fertile and sterile stamens distinct at base   (6)
6 (5) Stems terete, glabrous; bracts and bracteoles 1-3 mm; corolla ca. 4 cm.   6 P. haikangense
+ Stems 4-angled, pubescent; bracts and bracteoles 4-6 mm; corolla 2-3 mm.   7 P. latifolium

Lower Taxa


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