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1. Drosera Linnaeus, Sp. Pl. 1: 281. 1753.
茅膏菜属 mao gao cai shu
Herbs perennial or annual, with rhizomes, fibrous roots, or tubers with a vertical stolon below ground. Stem very short, long and erect, or climbing. Leaves basal and rosulate, or alternate, petiolate, with glandular, papillose hairs. Flowers bisexual, actinomorphic. Sepals (4 or)5(or 6-12), free or connate at base, persistent. Petals 5, free, closing and contorted after anthesis, persistent. Stamens as many as petals. Ovary superior, 1-loculed, 2-5-carpellate; placentation parietal; styles (2 or)3-5(or 6), free or connate at base, persistent. Capsule dehiscent, 2-6-valved. Seeds numerous, ellipsoid or linear, sometimes winged.
About 100 species: tropical to tundra regions, especially concentrated in Australia; six species (one endemic) in China.
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| 1 |
Stem elongate; leaves alternate, not stipulate; inflorescence axillary or terminal. |
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(2) |
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Stem short; leaves basal in a dense rosette, stipulate; inflorescence scapiform. |
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(3) |
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| 2 (1) |
Leaves linear; stem not forming tubers below ground |
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2 D. indica |
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Leaves peltate; stem forming tubers below ground |
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6 D. peltata |
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| 3 (1) |
Leaves orbicular or suborbicular, shorter than wide; testa pouch-shaped |
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5 D. rotundifolia |
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Leaves not orbicular, longer than wide, testa not pouch-shaped. |
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(4) |
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| 4 (3) |
Stipule adnate to petiole at base; bracts hastate, 3-5-parted; styles 5, incurved; placentas 5 |
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1 D. burmanni |
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Stipule not adnate to petiole at base; bracts subulate or linear; styles 3 or 4, deeply 2-parted, not incurved; placentas 3(or 4). |
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(5) |
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| 5 (4) |
Leaves circinately 1-folded toward stipule when young, leaf blade spatulate, obovate, or cuneate, 0.9-2.8 cm; peduncle and sepals abaxially densely glandular hairy; styles shorter than ovary |
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3 D. spathulata |
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Leaves circinately 2-folded toward stipule when young, leaf blade orbicular to oblanceolate, elliptic, or linear, 1.5-4.6 cm; peduncle and sepals glabrous; styles subequaling ovary |
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4 D. oblanceolata |
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Lower Taxa
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