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28. Alchornea Swartz, Prodr. 6: 98. 1788.
山麻杆属 shan ma gan shu
Authors: Huaxing Qiu & Michael G. Gilbert
Caturus Loureiro; Cladodes Loureiro; Stipellaria Bentham (1854), not Klotzsch (1848).
Trees or shrubs, dioecious or monoecious; indumentum of simple hairs. Leaves alternate; stipules small, deciduous; leaf blade simple, junction with petiole usually with 2-4 glands, mostly with 2 stipels, margin crenate or dentate; pinnately veined and shortly petiolate or palmately veined and long petiolate. Inflorescences terminal and/or axillary, branched or unbranched, male often axillary, female and bisexual terminal; bracts small, usually with 2 basal glands; flowers sometimes sessile. Male flowers fascicled; calyx closed in bud, 2-5-partite, valvate; petals absent; disk absent; stamens 4-8; filaments shortly connate; anthers 2-locular, introrse; pistillode absent. Female flowers usually 1 per bract; sepals 4-8, imbricate, sometimes 1-4-glandular; ovary 2- or 3-locular; ovules 1 per locule; styles 2 or 3, free or basally connate, simple, usually long. Fruit a capsule, 2- or 3(or 4)-locular, smooth or muricate. Seed globose, usually tuberculate.
About 50 species: tropical and subtropical regions; eight species (three endemic) in China.
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| 1 |
Leaves pinnately veined, stipels absent, petiole 0.5-3 cm; male inflorescence terminal, paniculate. |
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1 A. rugosa |
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Leaves with 3 basal veins, stipels present at base of leaf blade, petiole 2-20 cm; male inflorescence cauliflorous or at leafless node, unbranched, or if terminal then bisexual |
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(2) |
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| 2 (1) |
Capsules verrucate or tuberculate |
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(3) |
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Capsules smooth, not verrucate or tuberculate |
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(4) |
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| 3 (2) |
Branchlets villous; female sepals lanceolate, 2-2.5 mm; capsule subglobose, villous, verrucate. |
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7 A. hunanensis |
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Branchlets densely pubescent; female sepals subovate, 3-4 mm; capsule ellipsoid, puberulent, tubercled. |
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8 A. tiliifolia |
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| 4 (2) |
Plants monoecious; inflorescences often bisexual |
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(5) |
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Plants dioecious; male inflorescence spicate; female inflorescence racemose, terminal |
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(6) |
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| 5 (4) |
Inflorescence branched, terminal; styles filiform, ca. 8 mm; ovary tomentulose. |
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5 A. androgyna |
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Inflorescence not branched, axillary; styles thick, sublanceolate, 4-5 mm; ovary puberulent. |
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4 A. kelungensis |
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| 6 (4) |
Male inflorescence 1.5-3.5 cm; bracts ovate, ca. 2 mm. |
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2 A. davidii |
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Male inflorescence more than 5 cm; bracts triangular |
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(7) |
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| 7 (6) |
Leaves abaxially puberulent; capsule subglobose, tomentulose. |
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6 A. mollis |
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Leaves abaxially puberulent only along veins; capsule strongly 3-lobed, puberulent. |
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3 A. trewioides |
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List of lower taxa
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Treatments in Other Floras @ www.efloras.org
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