TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
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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.
Annual to shrub, generally glandular, aromatic
Stems generally branched above middle or throughout
Leaves generally cauline (some also basal and cauline), generally alternate, generally linear to (ob)lanceolate, entire to pinnately lobed, generally not spine-tipped; lower generally toothed to lobed; upper generally entire
Inflorescence: heads radiate, generally 1many in open cymes; involucre generally hemispheric; phyllaries generally linear to lanceolate, half-enclosing ray fruits; chaff scales generally in 1 ring between ray and disk flowers (scattered)
Ray flowers 3many; ligules generally 3-lobed, white to yellow
Disk flowers 3many, staminate or fruiting; corollas white to yellow, becoming red; anther tips ovate; style branches long, tips bristly
Fruit: ray achenes ± 3-angled; pappus 0; disk achenes cylindric or obconic, pappus 0 or scales generally linear to lanceolate
Species in genus: ± 25 species: CA, OR, w AZ, n Baja CA
Etymology: (Greek: half girdle, from sheathing phyllaries)
Reference: [Tanowitz 1982 Syst Bot 7:314339; Venkatesh 1958 Amer J Bot 45:7784]
Recent taxonomic note: *See revised taxonomy of Baldwin 1999 Novon 9:462471.
Native |
Annual 110 dm
Stems soft-hairy to bristly below, bristly and glandular-puberulent above
Leaves: bristly; lower 39 cm, oblong-oblanceolate, dentate to lobed; upper linear
Inflorescence open; heads long-peduncled; involucre 4.55 mm; phyllaries soft-hairy to densely glandular
Ray flowers 5; ligule 48 mm, pale yellow
Disk flowers 6, generally staminate; corollas and anthers yellow
Fruit 2.53 mm, beaked; disk pappus scales 612
Chromosomes: 2n=18
Ecology: Common. Open areas
Elevation: < 700 m.
Bioregional distribution: s Sierra Nevada Foothills, San Joaquin Valley, e San Francisco Bay Area, Southwestern California, alien in s Inner North Coast Ranges, w edge Mojave Desert
Distribution outside California: n Baja California
Flowering time: AprJul
Like H. pentactis
Recent taxonomic note: *Deinandra kelloggii (Greene) Greene