|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, perennial herb, subshrubs, decumbent to erect, taprooted
Stems simple or branched from base or above
Leaves simple, entire to pinnately lobed; basal petioled, ovate to spoon-shaped; cauline reduced upward, sessile, (ob)lanceolate to (ob)ovate
Inflorescence: heads radiate or discoid, terminal, solitary or clustered; involucres hemispheric, bell-shaped, obconic, or cylindric; phyllaries in 49 series, thin to tough but flexible, tips green or tinged purplish; receptacle concave, naked, shallowly pitted
Ray flowers present or 0, fertile or sterile; corollas yellow or white to purple
Disk flowers generally fertile (except L. occidentalis); corollas yellow, violet, purple, pink, or white, funnel-shaped to cylindric, marginal ones in rayless heads often enlarged and bilateral, deeply lobed on inner side, lobes spreading from head center; style appendages flat, triangular, awl-shaped, or cusped
Fruit obconic, mottled purple-brown; hairs dense, appressed, silky; pappus 0 in ray flowers, in disk flowers of many bristles, these free or fused at base, or fused throughout into awns, white, tan, or red-brown
Species in genus: 14 species: CA; NV, AZ, n Baja CA
Etymology: (C.F. Lessing, 18091862, German specialist in Asteraceae)
Incl CA sp. previously treated in Benitoa and Corethrogyne.
Annual; herbage without glands, tomentose, becoming glabrous with ageSee the CNPS Inventory for information about endangerment and rarity.
Stems decumbent or erect, 0.54 dm
Leaves: basal persistent, < 13 cm, linear to long-tapered obovate, entire to lobed; cauline 0.23 cm, reduced upwards, lanceolate to awl-shaped, tip with abrupt point, entire
Inflorescence: heads discoid, solitary or tightly clustered, terminal or axillary; involucres 0.51.3 cm, widely or rarely narrowly obconic; phyllaries lanceolate, woolly, tips purplish tinged, margins and midveins of inner ones ± white or tannish white
Ray flowers 0
Disk flowers 1020; corollas funnel-shaped, pink to lavender; style branches 1.52.5 mm, appendages 0.60.8 mm, awl-shaped
Fruit 35 mm; pappus bristles many in 2 unequal series, free to base, white or tannish white
Ecology: UNCOMMON. Fields, roadside ditches
Elevation: < 300 m.
Bioregional distribution: s North Coast Ranges, s Sacramento Valley, n San Francisco Bay Area.