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DROSERACEAE SUNDEW FAMILY

Elizabeth L. Painter & William J. Stone

Annual, perennial herb, [subshrub], carnivorous; roots weak. Leaf: generally basal rosette, often coiled in bud; blade with insect-catching hairs adaxially, hairs gland-tipped and sticky, [sensitive bristles]. Inflorescence: cyme, raceme-like, [flowers solitary]; flowers [1] few, on long peduncle. Flower: bisexual, radial; calyx lobes generally 5; petals generally 5, free or ± fused; stamens (4)5 [(10)20]; pistil 1, ovary superior, chamber 1, placentas generally 3(5), parietal, style generally 3(5), each generally 2-lobed. Fruit: capsule, loculicidal; valves generally 3(5). Seed: generally many, spindle-shaped.
3 genera (2 with 1 sp. each), 170+ species: temperate, tropics, especially Australia, South America, southern Africa; especially in bogs, swamps; some cultivated as novelties (Dionaea, Venus' fly-trap, of southeastern United States). —Scientific Editor: Thomas J. Rosatti.

DROSERA SUNDEW
Annual, perennial herb, often ± brown or ± red. Leaf: petiole long; adaxial blade hairs gland-tipped. Inflorescence: raceme-like cyme. Flower: sepals, petals, stamens generally 5; petals white, pink, or purple; styles, placentas, valves generally 3.
170+ species: range of family. (Greek: dewy) Insects and other organisms trapped by sticky fluid secreted by leaf glands are secured by leaf folding around them and digested by bacteria as well as additional leaf secretions (enzymes, ribonucleases), providing nutrition; many cultivated and/or non-native taxa, not all documented by specimens, persisting in North Coast (Mendocino Co., including Drosera tracyi Macfarl.), northern High Sierra Nevada (Plumas Co.) after reported, ill-advised plantings.
Unabridged note: Drosera aliciae Raym.-Hamet and Drosera capensis L. (North Coast; Mendocino Co.), and Drosera × hybrida Macf. (northern High Sierra Nevada; Plumas Co.), all documented by specimens, all persisting from reported, ill-advised plantings. Drosera binata Labill., Drosera burmanni Vahl, Drosera capillaris Poir., Drosera filiformis Raf., Drosera intermedia Hayne, Drosera nitidula Planch., Drosera occidentalis Morr., Drosera tracyi Macfarl., and Drosera slackii Cheek all have been reported in North Coast (Mendocino Co.) from similar plantings, but are not documented by specimens.

Key to Drosera

D. rotundifolia L. ROUND-LEAVED SUNDEW
NATIVE
Perennial herb. Leaf: blade 3–12 mm, 4–20 mm wide, base ± cordate or not. Inflorescence: peduncles 1–several, 5–35 cm. Flower: calyx 4–6 mm, fused at base; petals 4–6 mm, white to pink; style lobes 2, ± to base. Seed: 1–1.5 mm, finely, regularly longitudinally striate.
2n=20. Uncommon. Swamps, wet meadows, forests, peatlands, often with Sphagnum; < 2700 m. Northwestern California (especially near coast), Cascade Range, High Sierra Nevada; to eastern United States, circumboreal. Jun–Sep [Online Interchange]

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Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Dec 21 2014
Citation for this treatment: [Author of taxon treatment] 2013. Drosera, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=23487, accessed on Dec 21 2014

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click for enlargement Drosera rotundifolia
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1982 Gary A. Monroe

Geographic subdivisions indicated for the distribution of Drosera rotundifolia Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
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map of distribution 1
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).

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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.