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