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James C. Hickman

Annual to trees, some dioecious
Stem: nodes often swollen
Leaves simple, basal or cauline, alternate, opposite, or whorled, generally entire; stipules 0 or obvious and fused into a generally scarious sheath around stem
Inflorescence: small cluster, axillary or arrayed in cymes or panicles; involucres sometimes subtending 1–many flowers
Flower generally bisexual, small, ± radial; perianth generally 5–6-lobed, base ± tapered, often jointed to pedicel; stamens 2–9, often in 2 whorls; ovary superior, styles generally 3, generally fused at base
Fruit: achene, generally enclosed by persistent perianth, generally 3-angled, ovoid, and glabrous
Genera in family: 50 genera, 1100 species: worldwide, especially n temp; some cultivated for food (Fagopyrum ; Rheum , rhubarb; Rumex , sorrel) or ornamental (Antigonon , coral-vine; Muehlenbeckia ; Polygonum )
Reference: [Ronse Decraene & Akeroyd 1988 Bot J Linn Soc 98:321–371; Reveal et al. 1989 Phytologia 66(2–4):83–414]
Treatments of the 15 eriogonoid genera are based on the monographic work of James L. Reveal, who is gratefully acknowledged.


Species in genus: 1 sp
Etymology: (Latin: thread stem)
Reference: [Reveal & Ertter 1980 Madroño 27:101–109]


N. denudata Nutt.


Annual, prostrate to erect, 4–40 cm, woolly
Leaves basal; stipule 0; petiole indistinct; blade 5–80 mm, linear to oblanceolate
Inflorescence open, 20–80 cm diam; branches wiry; bracts 3 per node, 1–5 mm, generally linear; involucral bracts many, 1–4 mm, oblanceolate, upper surface very woolly; flowers 5–30 per involucre
Flower: perianth 0.8–1.5 mm, greenish white to dark red, glabrous or glandular, lobes 6; stamens 3
Fruit ± 1 mm, brown to black
Ecology: Coastal strand, desert scrub, etc., in sandy soils
Elevation: < 400 m.
Bioregional distribution: Southwestern California, Mojave Desert (Devil's Playground), Sonoran Desert
Distribution outside California: Arizona, nw Mexico

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bioregional map for NEMACAULIS%20denudata being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Nemacaulis denudata
Retrieve dichotomous key for Nemacaulis
Retrieve multiple-entry key (MEKA) for Nemacaulis
Overlay Consortium of California Herbaria specimen data by county on this map
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