|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 to shrubs, ± woolly
Leaves generally alternate, entire to nearly compound
Inflorescence: heads 1many, generally radiate; cluster often ± flat-topped; involucre obconic to hemispheric; phyllaries in 1 series, free or ± fused; receptacle flat to columnar, generally naked
Ray flowers generally ± 1 per phyllary; ligules entire to lobed, generally yellow (white)
Disk flowers (3)10300; corolla yellow; anther tips ovate, deltate or awl-shaped
Fruit 4-angled or flattened in outer flowers, generally club-shaped in inner flowers; pappus 015 ± jagged or fringed scales
Species in genus: 14 species: w North America
Etymology: (Greek: woolly leaf)
Reference: [Mooring 1991 Madroño 38:213226]
Annual species by Dale E. Johnson.
Annual 12.5 cm, tufted, spreading, loosely white-woollySee the CNPS Inventory for information about endangerment and rarity.
Leaf 310 mm, spoon- to wedge-shaped, entire or 23-lobed (lobes pointed)
Inflorescence: head 1, discoid, ± sessile; involucre 34 mm, ± cylindric; phyllaries 34, acute, free; receptacle ± pointed-columnar, flanges 3, protruding between fruits, spine-tipped
Ray flowers 0
Disk flowers ± 3; corollas ± 2 mm, throat minutely puberulent; anther tips narrowly deltate
Fruit 22.5 mm, narrowly obconic, strigose; pappus ± 1.5 mm
Ecology: Creosote-bush scrub
Elevation: 500800 m.
Bioregional distribution: c Mojave Desert (wc San Bernardino Co.)
Flowering time: AprMay