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©Copyright 1993 by the Regents of the University of California
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DROSERACEAE

SUNDEW FAMILY

William J. Stone

Annual, perennial herb, subshrub, carnivorous; roots weak
Leaves generally basal rosette, often coiled in bud; blade with insect-catching hairs on upper surface, hairs either gland-tipped and sticky or sensitive bristles
Inflorescence: cyme or raceme-like; flowers 1–few, on long peduncle
Flower bisexual, radial; calyx lobes generally 5; petals generally 5, free or slightly fused; stamens 4–20; pistil 1, ovary superior, chamber 1, placentas generally 3(5), parietal, style branches generally 3(5), each generally 2-lobed
Fruit: capsule, loculicidal; valves generally 3(5)
Seeds generally many, spindle-shaped
Genera in family: 4 genera (3 with 1 sp. each), 100 species: temp, tropical, especially Australia, New Zealand, especially in bogs, swamps; some cultivated as novelties (Dionaea, Venus' fly-trap, of se US)
Etymology: (Greek: dewy)

DROSERA

SUNDEW

Annual, perennial herb, often brownish or reddish
Leaf: petiole long; blade hairs on upper surface stalked, gland-tipped (glands secrete sticky, insect-trapping fluid, leaf folds around prey, which is digested by enzymes, ribonucleases, and bacteria)
Inflorescence: raceme-like cyme
Flower: sepals, petals, stamens generally 5; main style branches, placentas, valves generally 3
Species in genus: 100 species: range of family. D. filiformis Raf. and D. linearis Goldie were planted in NCo (Mendocino Co.) and may persist.

Native

D. rotundifolia L.

ROUND-LEAVED SUNDEW


Leaf: blade 4–12 mm, 4–12 mm wide, base sometimes ± cordate
Inflorescence: peduncles 1–several, 5–25 cm
Flower: calyx 4–6 mm, fused only at base; petals 4–6 mm, white to pink; style branches 2-lobed nearly to base
Seed 1–1.5 mm, spindle-shaped, light brown
Chromosomes: 2n=20
Ecology: Uncommon. Sphagnum bogs
Elevation: 0–2000 m.
Bioregional distribution: Scattered in Northwestern California (especially near coast), Cascade Range, High Sierra Nevada
Distribution outside California: to e US, circumboreal
Horticultural information: WET, bog and pure water: 4, 5, 6, 7, 15, 16, 17; DFCLT.

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bioregional map for DROSERA%20rotundifolia being generated
 
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