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Genus Drosera Family Droseraceae

Description: Perennial or annual herbs with rhizomes, fibrous roots, or tubers with vertical underground stolon. Stems usually very short, sometimes long and erect, [or climbing and to 1.5 m long].

Leaves circinate, either all basal in a rosette, or basal and cauline, or all cauline, the upper surface covered with glandular hairs that trap insects, rarely leaves glabrous.

Flowers mostly in cymes, often raceme-like, or solitary, usually terminal, often glandular. Sepals, petals and stamens mostly 5, free or the sepals shortly united at base.

Fruit a loculicidal capsule.

Photo © ANBG

Distribution and occurrence: World: >90 species, world-wide. Australia: 54 species (42 species in SW Australia), all States.

Text by G. J. Harden
Taxon concept:

 Key to the species 
1Cauline leaves peltate with lamina concave, circular, reniform or crescent-shaped2
Cauline leaves absent, if present then lamina linear, spathulate or fan-shaped, not peltate6
2Sepals variously hairy, sometimes glabrous; margin fimbriate3
Sepals glabrous; margin entire, erose or denticulate
                       Back to 1
3Basal rosette of leaves red; cauline leaves <6 mm wide; sepals 0.1–1.5 mm wide; seeds ovoid to obovoid,0.4–0.8 mm long, with surface shallowly reticulateDrosera peltata
Basal rosette of leaves yellow-green; cauline leaves up to 10 mm wide; sepals 0.7–2.4 mm wide; seeds cylindrical, pandurate to obovoid, 0.5–0.8 mm long, with surface deeply pitted
                       Back to 2
Drosera hookeri
4Seeds always cylindrical, usually > 1 mm longDrosera auriculata
Seeds ovoid or arachiform, rarely cylindrical and then < 1 mm long
                       Back to 2
5Seed surface shallowly pitted; seeds ovoid, < 0.4 mm longDrosera lunata
Seed surface deeply pitted; seed shape variable, ovoid, arachiform to shortly cylindrical, 0.5–0.8 mm long
                       Back to 4
Drosera hookeri
6Leaves simple, linear or if forked then lobes linear7
Leaves simple, varying from orbicular, obovate to flabellate, never linear nor forked
                       Back to 1
7Leaves cauline, simpleDrosera indica
Leaves basal, simple or forked
                       Back to 6
8Leaves usually forked once, sometimes more; lobes 20–100 mm long; corolla whiteDrosera binata
Leaves simple, unlobed; corolla white to pink-mauve
                       Back to 7
9Inflorescences 15–30-flowered; corolla usually pink-mauve (cultivars of dark pink or white are available)Drosera capensis
Inflorescences 1(–2)-flowered; corolla white
                       Back to 8
Drosera arcturi
10Leaves sessile or petiole shorter than lamina11
Leaves with a distinct petiole, longer than the lamina
                       Back to 6
11Bracts simple; calyx minutely glandular; styles 3, divided in 2 to baseDrosera spatulata
Bracts trifid; calyx tuberculate; styles 5, filiform
                       Back to 10
Drosera burmanni
12Sepals and petals 5; inflorescence many-flowered, flowers orange or red; leaves not peltate, 10–20 mm longDrosera glanduligera
Sepals and petals 4; flowers solitary, white; leaves peltate, 3–7 mm long
                       Back to 10
Drosera pygmaea

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