|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL (1993)||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY
Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1many 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)45; stamens 45, 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):128. See glossary p. 25 for illustrations of general family characteristics.
Subshrubs, appearing glabrous
Stems decumbent, widely spreading or erect, striate; old growth gray, bark sometimes shreddy with age; new growth white below, tips green
Leaves simple, sometimes in axillary clusters below, spreading-ascending to appressed-erect, linear to narrowly oblanceolate, generally minutely spine-tipped, pale green to light gray-green
Inflorescence: heads radiate or discoid, 1many in rounded to ± flat-topped clusters, very small in bud, expanding rapidly in fruit; involucres widely bell-shaped to nearly spheric; phyllaries 2024 in 23 series, ovate to ovate-elliptic, bases cream-yellow, tips green, margins scarious; receptacle deeply pitted, with projections between flowers but not chaffy
Ray flowers present or 0; ligules yellow
Disk flowers many; corollas funnel-shaped, yellow, sinuses deep, lobes spreading to reflexed, style-branch appendages lanceolate
Fruit densely long-hairy, hairs white, bronze, or brownish; pappus of 2025 wide, stiff, widely spreading bristles, slightly > fruit
Species in genus: 2 species: sw US
Etymology: (Greek: unbending pappus)
Reference: [Lane 1988 Madroño 35:247265]
Stems much-branched, ascending to erect, generally < 1 m
Leaves < 1.5 cm, < 3 mm wide, generally linear to oblanceolate
Inflorescence: heads very many, borne singly or clustered; involucre hemispheric to spheric
Ray flowers 0
Disk flowers 1327; corollas 23.5 mm
Fruit < 3 mm
Ecology: Gravelly or rocky soils on flats or slopes in deserts to juniper woodlands
Elevation: 602200 m.
Bioregional distribution: Tehachapi Mountain Area, San Gabriel Mountains, San Bernardino Mountains, Peninsular Ranges, East of Sierra Nevada, Desert
Distribution outside California: to Utah, s Nevada, Arizona
Varieties sometimes occur together and intergrade.
Herbage ± densely rough-puberulent
Stems generally < 6 dm
Ecology: Habitats of sp.
Elevation: < 1600 m.
Bioregional distribution: Tehachapi Mountain Area, San Gabriel Mountains, San Bernardino Mountains, East of Sierra Nevada, Mojave Desert
Distribution outside California: Arizona, s Nevada
Flowering time: MayJun