Jepson Flora Project: Jepson Interchange    

 
link to manual TREATMENT FROM THE JEPSON MANUAL (1993) previous taxon | next taxon
Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.

ASTERACEAE

SUNFLOWER FAMILY

David J. Keil, Family Editor and author, except as specified

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.

LASTHENIA

GOLDFIELDS

Robert Ornduff

Annual, perennial herb, glabrous or hairy
Stem generally branched, generally erect, < 60 cm
Leaves opposite, < 20 cm, entire to pinnately cut
Inflorescence: heads radiate, solitary or in cymes; phyllaries in 1 or 2 series, free or partly fused; receptacle narrowly conic to hemispheric, naked, smooth, pitted, or rough
Ray flowers 4–21; ligules generally yellow
Disk flowers generally many; corollas generally 5-lobed, generally yellow; anther tips acuminate to triangular; style tips triangular or round, generally hair-tufted
Fruit < 5 mm, cylindric to obovoid, black or gray; pappus of awns, scales, or 0
Species in genus: 17 species: w North America, Chile
Etymology: (Greek: female pupil of Plato)
Reference: [Ornduff 1966 Univ Calif Publ Bot 40:1–92]
Generally self-incompatible (cross-pollinated).

Native

L. burkei (Greene) Greene

BURKE'S GOLDFIELDS

Annual < 30 cm
Stem simple or freely branched, hairy
Leaves < 5 cm, linear, entire or pinnately lobed, glabrous to ± hairy
Inflorescence: involucre 4–6 mm, dome-shaped or obconic; phyllaries 7–16, free, hairy; receptacle dome-shaped or conic, glabrous or hairy
Ray flowers 8–13; ligules < 6 mm
Disk flowers many; anther tips linear to ± ovate; style tips triangular
Fruit < 1.5 mm, club-shaped, hairy; pappus generally of 1 long awn and many short scales
Chromosomes: 2n=12
Ecology: Vernal pools, wet meadows
Elevation: < 500 m.
Bioregional distribution: s Inner North Coast Ranges (s Mendocino, s Lake, and ne Sonoma cos.)
Horticultural information: In cultivation.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for LASTHENIA%20burkei being generated
 
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Lasthenia burkei
Retrieve dichotomous key for Lasthenia
Retrieve multiple-entry key (MEKA) for Lasthenia
Overlay Consortium of California Herbaria specimen data by county on this map
Show other taxa with the same California distribution | Read about bioregions | Get lists of plants in a bioregion
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