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FOC | Family List | FOC Vol. 8 | Droseraceae

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.

1 Stem elongate; leaves alternate, not stipulate; inflorescence axillary or terminal.   (2)
+ Stem short; leaves basal in a dense rosette, stipulate; inflorescence scapiform.   (3)
2 (1) Leaves linear; stem not forming tubers below ground   2 D. indica
+ Leaves peltate; stem forming tubers below ground   6 D. peltata
3 (1) Leaves orbicular or suborbicular, shorter than wide; testa pouch-shaped   5 D. rotundifolia
+ Leaves not orbicular, longer than wide, testa not pouch-shaped.   (4)
4 (3) Stipule adnate to petiole at base; bracts hastate, 3-5-parted; styles 5, incurved; placentas 5   1 D. burmanni
+ Stipule not adnate to petiole at base; bracts subulate or linear; styles 3 or 4, deeply 2-parted, not incurved; placentas 3(or 4).   (5)
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   3 D. spathulata
+ 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   4 D. oblanceolata

Lower Taxa


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