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3. Polyspora Sweet, News Lit. Fashion. 2: 205. 1825.
大头茶属 da tou cha shu
Shrubs or trees, evergreen. Leaves alternate but often clustered apically on branchlets, petiolate; leaf blade leathery, pinnately veined, margin entire or serrate. Flowers axillary, solitary or in a short raceme. Pedicel short; bracteoles 2-7, caducous. Sepals 5, caducous after anthesis. Petals 5(or 6), basally ± connate. Stamens numerous; outer filament whorl adnate to petals; anthers dorsifixed. Ovary placentation axile. Capsule oblong-cylindric or cylindric, 5(or 6-8)-loculed, loculicidal; columella persistent to apex of locules. Seeds flat, apically with an oblong membranous wing; endosperm thin.
About 40 species: E and SE Asia; six species (two endemic) in China.
Molecular evidence has shown that Polyspora is not closely related to Gordonia J. Ellis, which is now considered to be strictly a New World genus (Prince & Parks, Amer. J. Bot. 88: 2309-2320. 2001; Yang et al., Pl. Syst. Evol. 248: 45-55. 2004).
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| 1 |
Capsule 6-8-loculed. |
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5 P. tiantangensis |
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Capsule 5-loculed |
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(2) |
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| 2 (1) |
Leaf blade apex rounded, obtuse, or emarginate |
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(3) |
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Leaf blade apex bluntly acute, acuminate, or shortly acuminate |
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(4) |
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| 3 (2) |
Petiole 10-15 mm, glabrous; leaf blade margin entire or apically remotely crenate. |
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1 P. axillaris |
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Petiole 3-5 mm, appressed pubescent; leaf blade margin serrate. |
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2 P. chrysandra |
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| 4 (2) |
Current year branchlets, petioles, abaxial surface of leaf blades, and basal part of filaments with pubescence; capsule 4-5 cm. |
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4 P. longicarpa |
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Current year branchlets, petioles, abaxial surface of leaf blades, and basal part of filaments glabrous; capsule 1-3.5 cm |
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(5) |
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| 5 (4) |
Young branches slender; leaf blade narrowly oblong to oblanceolate, 8-13 × 2-3 cm; flowers ca. 4 cm in diam. |
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3 P. hainanensis |
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Young branches stout; leaf blade elliptic to oblong-elliptic, (9-)10-18 × 3-6(-7) cm; flowers 5 cm or more in diam. |
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6 P. speciosa |
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Lower Taxa
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