This page is based on the 1993 Jepson Manual.
Please see the Jepson eFlora for up-to-date information about California vascular plants.
|Jepson Flora Project: Jepson Interchange|
|TREATMENT FROM THE JEPSON MANUAL||
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
Print edition is available from the University of California Press
|The second edition of The Jepson Manual (2012) is available from the University of California Press|
|See also the Jepson eFlora, which parallels the Second Edition|
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, glabrous to ± hairy
Stems generally erect, often winged, generally glabrous below, ± short-hairy above
Leaves simple, alternate, gland-dotted
Inflorescence: heads radiate or discoid; involucre disk-shaped; phyllaries in 13 series, free or ± fused, subequal or outer longer; receptacle strongly convex to spheric or conic, naked
Ray flowers fertile or sterile; corollas yellow; ligule fan-shaped, generally strongly 3-lobed
Disk flowers many; corollas 45-lobed, yellow to red or purplish brown; anther appendages short-triangular; style branches ± truncate
Fruit obconic, ribbed, ± hairy; pappus of 510 scales or 0
Species in genus: ± 35 species: North America, South America
Etymology: (Helen of Troy)
Reference: [Bierner 1972 Brittonia 24:331355]
Stem 210 dm; branches fewmany
Leaves mostly cauline; lower often with short, winged petioles; upper sessile, decurrent; blades oblanceolate to elliptic, obtuse to acute, generally ± toothed, glabrous or sparsely hairy
Inflorescence: heads severalmany in a ± flat-topped cyme; peduncles 310 cm, short-hairy; receptacle 35 mm diam
Ray flowers 1020; ligules 1025 mm
Disk flowers: corollas 5-lobed, 33.5 mm, yellow throughout
Fruit 1.52 mm, sparsely hairy; pappus scales awn-tipped, 11.5 mm
Ecology: Wet places
Elevation: < 2000 m.
Bioregional distribution: North Coast, Klamath Ranges, Modoc Plateau
Distribution outside California: to British Columbia, e N.America
Plant generally 412 dm, sparsely puberulent or becoming glabrous
Ray flowers: ligules 1525 mm
Ecology: Wet places
Elevation: < 500 m.
Bioregional distribution: n North Coast, w Klamath Ranges
Distribution outside California: to British Columbia
Horticultural information: IRR or WET, SUN: 4, 5, 15, 16, 17.
|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).|