Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.



David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many per head
Flowers bisexual, unisexual, or sterile, ± small, of several types; calyx 0 or modified into pappus of bristles, scales, or awns, which is generally persistent in fruit; corolla radial or bilateral (rarely 0), lobes generally (0)4–5; stamens 4–5, anthers generally fused into cylinder around style, often appendaged at tips, bases, or both, filaments generally free, generally attached to corolla near throat; pistil 1, ovary inferior, 1-chambered, 1-seeded, style 1, branches 2, generally hair-tufted at tip, stigmas 2, generally on inside of style branches
Fruit: achene, cylindric to ovoid, generally deciduous with pappus attached
Genera in family: ± 1300 genera, 21,000 species (largest family of dicots): worldwide. Largest family in CA. Also see tribal key to CA genera: Strother 1997 Madroño 44(1):1–28. See glossary p. 25 for illustrations of general family characteristics.


Theodore M. Barkley

Annual to low, dense subshrub (< 40 cm diam in CA), much-branched, ± hairy and scaly; odor turpentine-like
Leaves alternate, hairy; blade ± ovate to reniform
Inflorescence: heads discoid, peduncled in axils; involucre ± obconic; phyllaries in 2 series; receptacle flat, naked
Disk flowers 9–50; corollas cylindric, in CA light yellow and often fading reddish, glandular, ± soft-hairy; anther bases ± sagittate, tips acute to blunt; style branches ± shaggy-papillate, ± truncate or with tapered appendage
Fruit cylindric to obconic, weakly 10-ribbed, densely hairy in CA; pappus of many bristles in 1–4 series
Species in genus: 5 species: sw North America
Etymology: (Greek: brittleness, from stems)
Reference: [Strother 1978 North America Fl II 10:142–146]


P. ramosissima (Torr.) A. Gray


Stems woolly, becoming glabrous and shiny
Leaves ± long-petioled; blade 8–20 mm, prominently few-toothed, brown- to gray-green, velvety and woolly-scaly
Inflorescence: outer phyllaries 5–6 mm, recurved, wider than inner; inner phyllaries 12–15, deciduous
Flowers 16–32; corollas 4.5–5 mm
Fruit 2–3+ mm; pappus bristles 120–140 in 3–4 series, fine, brownish
Chromosomes: 2n=34
Ecology: Sandy creosote-bush scrub
Elevation: generally < 1000 m.
Bioregional distribution: s East of Sierra Nevada, Desert
Distribution outside California: s Nevada, Arizona, nw Mexico
Flowering time: Mar–Jun (sometimes in winter)
Horticultural information: DRN, SUN: 10, 11, 12, 13 &DRY: 1, 2, 3, 8, 9, 19, 20, 21; DFCLT.

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bioregional map for PSATHYROTES%20ramosissima 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 Psathyrotes ramosissima
Retrieve dichotomous key for Psathyrotes
Retrieve multiple-entry key (MEKA) for Psathyrotes
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