|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.
Annual, generally grayish, cobwebby to tomentose
Stems 1several from base, ± spreading to ascending, ± forked, generally ± evenly leafy below, ± leafless between upper forks
Leaves simple, alternate, ± sessile, generally elliptic to oblanceolate, entire
Inflorescence: heads disciform, ± sessile in groups of 210; bracts like leaves; phyllaries 0 or vestigial (or 14 reduced, unequal scales); receptacle (2.8)48 X > wide, ± cylindric to club-shaped; chaff scales subtending pistillate flowers phyllary-like, each generally enclosing a flower (or outermost open), falling with a fruit, generally woolly, ± scarious-winged, wing generally elliptic to obovate, base generally acute; chaff scales subtending disk flowers reduced, open or folded, glabrous to cobwebby, scarious
Pistillate flowers in 3several series; corollas tubular
Disk flowers 26, staminate; ovary vestigial
Fruit obovoid, smooth, shiny; style ± at tip; pappus 0; disk pappus generally of 112 bristles
Species in genus: 7 species: sw North America
Etymology: (Greek: column bed, from long receptacle)
Reference: [Morefield 1992 Madroño 39:114130]
Close to Filago subg. Oglifa, especially F. depressa. See also Ancistrocarphus, Micropus.
See the CNPS Inventory for information about endangerment and rarity.
Stems < 15 cm
Leaves < 13 mm, generally obtuse; uppermost < 10 mm, elliptic to ± lanceolate, acute
Inflorescence: heads 3.54.5 mm, 34 mm wide, ± spheric; phyllaries 0 or vestigial; receptacle club-shaped, length 2.83.5 X width; longest chaff scale 1.93.1 mm, winged toward tip, body (except midvein) generally membranous; outermost chaff scales ± closed, woolly
Disk flowers 1.21.9 mm
Fruit 0.60.8 mm, ± compressed side-to-side; disk ovary 0.30.6 mm, pappus bristles 38, 0.91.3 mm
Ecology: Open sandy drainages
Elevation: ± 400 m.
Bioregional distribution: Sonoran Desert (Hayfields, Riverside Co., Apr 1930, perhaps extirpated)
Distribution outside California: se Arizona, ne Sonora
Flowering time: MarApr
Like Filago depressa , which may have been involved in its origin.