Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California

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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

POLYGONACEAE

BUCKWHEAT FAMILY

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.

NEMACAULIS


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

Native

N. denudata Nutt.

WOOLLY-HEADS

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

Native

var. gracilis Goodman & L.D. Benson


Flowers generally obscured by surrounding wool; outer perianth lobes generally linear
Ecology: Habitat of sp
Elevation:
Bioregional distribution: Southwestern California, Mojave Desert (Devil's Playground), Sonoran Desert
Distribution outside California: Arizona, nw Mexico
Flowering time: Mar–May
Horticultural information: TRY.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for NEMACAULIS%20denudata%20var.%20gracilis being generated
 
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)

Retrieve Jepson Interchange Index to Plant Names entry for Nemacaulis denudata var. gracilis
Retrieve dichotomous key for Nemacaulis
Retrieve multiple-entry key (MEKA) for Nemacaulis
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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