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21. Dichroa Loureiro, Fl. Cochinch. 1: 301. 1790.
常山属 chang shan shu
Huang Shumei (Hwang Shu-mei); Bruce Bartholomew
Shrubs or subshrubs. Leaves opposite, rarely alternate apically on stem. Inflorescence terminal, a corymbose cyme or panicle. Flowers bisexual. Calyx tube adnate to ovary, obconical; lobes 5(or 6). Petals 5(or 6), variously colored, induplicate-valvate in bud. Stamens 4-10(-20); filaments filiform or subulate; anthers ellipsoid to ovoid, 2-loculed. Ovary semi-inferior to subinferior, incompletely 3-5-loculed; placentation parietal; ovules numerous. Styles 2-6, free or connate only at base, divergent; stigma oblong to subglobose. Fruit a fleshy berry, 1-valved, slightly dry. Seeds ovoid, minute; seed coat membranous, reticulate; embryo surrounded by fleshy endosperm.
Twelve species: mainly in E Asia and adjacent islands; six species (four endemic) in China.
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| 1 |
Ovary semi-inferior; flower buds subglobose; styles (2 or)3(or 4), stigma subglobose; filaments subulate. |
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(2) |
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Ovary inferior to 3/4 so; flower buds obovoid to oblong-obovoid; styles 4-6 (sometimes 3 in D. hirsuta), stigma oblong; filaments filiform. |
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(3) |
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| 2 (1) |
Leaf blade densely villous abaxially, glabrous adaxially; inflorescence a corymbose cyme, 5-7 cm |
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5 D. mollissima |
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Leaf blade crisped pubescent on both surfaces; inflorescence a corymbose panicle, 10-22 cm |
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6 D. yunnanensis |
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| 3 (1) |
Branchlets, petioles, and leaf veins crisped pubescent or glabrous; inflorescence a corymbose panicle |
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1 D. febrifuga |
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Branchlets, petioles, and leaf veins both crisped pubescent and pellucid villous; inflorescence a corymbose cyme. |
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(4) |
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| 4 (3) |
Calyx lobes obtusely deltoid, ca. 1 mm, glabrous |
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2 D. daimingshanensis |
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Calyx lobes lanceolate, 2.5-6 mm, hirsute. |
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(5) |
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| 5 (4) |
Petals densely hirsute on both surfaces; anthers glabrous; leaf blade apex acute |
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3 D. yaoshanensis |
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Petals glabrous or sparsely hirsute abaxially; anthers with filiform hairs or glabrous; leaf blade apex acuminate to caudate |
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4 D. hirsuta |
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Lower Taxa
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