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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, s Africa; especially in bogs, swamps; some cultivated as novelties (Dionaea, Venus' fly-trap, of se US). —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 NCo (Mendocino Co., including Drosera tracyi Macfarl.), n SNH (Plumas Co.) after reported, ill-advised plantings.
Unabridged note: Drosera aliciae Raym.-Hamet and Drosera capensis L. (NCo; Mendocino Co.), and Drosera × hybrida Macf. (n SNH; 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 NCo (Mendocino Co.) from similar plantings, but are not documented by specimens.

Key to Drosera

D. anglica Huds. ENGLISH SUNDEW
NATIVE
Perennial.
Leaf: blade 15–50 mm, 2–7 mm wide.
Inflorescence: peduncle generally 1, 6–25 cm.
Flower: calyx 4–6 mm, ± 1/3 fused; petals 8–12 mm, white; style lobes 2, <= 2/3 to base.
Seed: 1–1.5 mm, longitudinally striate-netted.
2n=40. Swamps, peatlands, often with Sphagnum; 1300–2000 m. Klamath Ranges, Cascade Range, n High Sierra Nevada (n of Lake Tahoe), s Warner Mountains; circumboreal. Lvs often especially long in CA (Barry Rice, pers. comm.). Sterile hybrids with Drosera rotundifolia, generally more clumped than Drosera anglica but distinguished only by fruit, may be called Drosera ×obovata Mert. & W.D.J. Koch. Jun–Aug [Online Interchange] {CNPS list}
Unabridged note: Drosera longifolia L. rejected as ambiguous.

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].

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Bioregions in which taxon occursRed area (if present) is the part of the bioregion lying between the upper and lower elevation limits of the taxon;
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 have georeferencing or identification issues.
map of distribution 1

Chart based on elevation range in Manual and elevations and coordinates of CCH records.
Data provided by the participants of the Consortium of California Herbaria.
Note: About half of the CCH records include both elevation and coordinates.
Map made in collaboration with Scott Loarie. 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 Manual flowering time.