Jepson Interchange (more information)
Print edition is available from the University of California Press
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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 |
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TREATMENT FROM THE JEPSON MANUAL |
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Jepson Interchange (more information) |
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©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, 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.
Annual, taprooted, much-branched, generally ± white-hairy
Leaves petioled, generally opposite below, alternate above
Inflorescence: heads disciform, many; involucre cup- to bell-shaped; phyllaries few in 1 series, small, free; receptacle chaffy
Pistillate flowers 0–2; corolla 0; style branches long
Staminate flowers 5–20; corolla greenish to dull purple; anthers free, exserted, filaments fused, attached at corolla tube base
Fruit compressed, winged, falling with chaff scale; pappus 0
Species in genus: 3–4 species: sw US, nw Mex
Etymology: (Greek: 2 bugs, from 2-fruit heads)
| Native |
Plant 3–9 dm, generally white-hairy
Leaves generally ± densely canescent; lower 3–5 cm, lanceolate to triangular-ovate, toothed, generally 3-veined; upper reduced, ± round, ± entire
Inflorescence: phyllaries generally 3–5, 2–5 mm, reflexed in age
Pistillate flowers generally 2
Staminate flowers: corolla ± 3 mm
Fruit 3–6 mm, ± keeled, glabrous, wings toothed
Chromosomes: 2n=36
Ecology: Sandy soil
Elevation: < 1300 m.
Bioregional distribution: Desert
Distribution outside California: to s Utah, w Arizona, nw Mexico
Flowering time: Sep–Jan
Highly variable; features vary ± independently
Synonyms: subspp. clarkiae (P.B. Kenn.) D.D. Keck and hispidula (Rydb.) D.D. KeckHorticultural information: TRY; STBL.
| 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). |
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