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37. Hosta Trattinnick, Arch. Gewächsk. 1: 55. 1812.
[nom. cons.]
玉簪属 yu zan shu
Chen Xinqi (陈心启 Chen Sing-chi); David E. Boufford
Herbs perennial, rhizomatous. Rhizome horizontal, large, sometimes with stolons. Leaves numerous, basal, spiral, long petiolate. Scape terminal, usually with a few bractlike cauline leaves. Inflorescence a terminal raceme, few to many flowered; bracts green or white. Flowers bisexual, solitary, rarely in clusters of 2 or 3; pedicel short. Perianth white to blue or lavender, tubular-campanulate or nearly funnelform; segments 6, connate. Stamens 6, free or rarely adnate to perianth tube near base; filaments filiform; anthers dorsifixed, introrse, dehiscing longitudinally. Ovary 3-loculed; ovules many per locule. Style filiform; stigma capitate, small. Fruit a loculicidal capsule. Seeds many, black.
About 45 species: mainly in Japan, a few species in China, Korea, and Russia; four species (three endemic) in China.
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| 1 |
Perianth white, 10 cm or more; flowers fragrant, subtended by 2 bracts; filaments adnate to perianth tube near base; capsule ca. 6 cm |
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1 Hosta plantaginea |
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Perianth purplish red, purple, or white with purple streaks, 4--6.5 cm; flowers not fragrant, subtended by 1 bract; filaments free; capsule less than 6 cm. |
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(2) |
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| 2 (1) |
Petiole winged at least in distal 1/2, wings 2--5 mm wide; bracts 0.5--0.7 cm |
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4 Hosta ensata |
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Petiole scarcely winged; bracts 1--3.5 cm. |
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(3) |
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| 3 (2) |
Plants green, glabrous, not white powdery; base of leaf blade usually cordate or truncate; perianth purple-red; bracts 1--2 cm |
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2 Hosta ventricosa |
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Plants white powdery particularly on abaxial surface of leaves; base of leaf blade cuneate; perianth white, with purple streaks; bracts 1--3.5 cm |
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3 Hosta albofarinosa |
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Lower Taxa
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