| TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
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, 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.
Species in genus: 1 sp
Etymology: (Anagram formed from name of collector of type material, E. Palmer, 1831–1911)
Reference: [King & Robinson 1987 Monogr Syst Bot Missouri Bot Garden 22:235–237]
| Native |
Annual < 40 cm, glabrous to puberulent
Leaves opposite below, alternate above, generally sessile, < 5 cm, linear, generally entire
Inflorescence open; heads discoid, many, 8–14 mm, 5–6 mm wide; involucre cylindric to narrowly bell-shaped; phyllaries 20–25, unequal, in several series, lanceolate; receptacle flat, naked
Flowers ± 30; corollas 5–6 mm, cylindric, ± white, pink-tinged; anther bases rounded, tips oblong; style branches long, club-shaped, rounded
Fruit 3 mm, slender, 5-ribbed; pappus of 3 bristles 5 mm and 3 scales 0.5 mm
Chromosomes: 2n=20
Ecology: Sandy creosote-bush scrub
Elevation: < 500 m.
Bioregional distribution: Sonoran Desert
Distribution outside California: n Mexico
Flowering time: Apr, Dec