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, perennial herb, subshrubs
Stems ascending or erect
Leaves simple, opposite below, alternate above, generally petioled; blades entire
Inflorescence: heads radiate or discoid, in cymes; involucre ± cylindric; phyllaries in 23 ± equal series; receptacle flat, naked
Ray flowers 0few; corolla ± purple
Disk flowers fewmany; corollas radial or ± bilateral, white to ± purple, lobes narrowly triangular; anther tips triangular; style branches linear
Fruit 4-angled, narrowly obpyramidal; pappus of 410 scales
Species in genus: 12 species: sw US, Mex
Etymology: (J. Palafox, Spanish general, 17761847)
Reference: [Turner & Morris 1976 Rhodora 78:567628]
Native |
Annual
Stems generally erect, much-branched
Leaves 212 cm; petioles 515 mm; blades linear to linear-lanceolate
Inflorescence: heads discoid; cymes ± flat-topped; involucre cylindric or ± obconic; phyllaries linear, scabrous to densely glandular
Flowers 940; corollas white to pink; anthers pink to purple
Fruit 1015 mm, ± strigose; pappus of outer achenes 0 or of 38 scales of varying length; pappus of inner achenes of 4 scales 812 mm and 4 shorter scales
Ecology: Sandy places
Elevation: < 1000 m.
Bioregional distribution: Desert
Distribution outside California: Nevada, Arizona, n Mexico
Synonyms: P. linearis (Cav.) Lag. misapplied
Native |
Stems generally 920 dm, ± glabrous; axis and branches generally 510 mm diam, ± glabrous
Leaves 612 cm, generally ± glabrous
Inflorescence: heads generally 1020, 2835 mm (including flowers); involucre 1020 mm diam, obconic; phyllaries 1625 mm
Flowers 1840; corollas 1013 mm, radial
Fruit 1216 mm
Chromosomes: 2n=24
Ecology: Desert sand dunes
Elevation: < 100 m.
Bioregional distribution: Sonoran Desert (se Imperial Co.)
Distribution outside California: sw Arizona
Flowering time: MarMay
Synonyms: P. linearis var. g. M. E. Jones