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, perennial herb, subshrubs
Stems ascending or erect
Leaves simple, opposite below, alternate above, generally petioled; blades entire
Inflorescence: heads radiate or discoid, in cymes; involucre ± cylindric; phyllaries in 2–3 ± equal series; receptacle flat, naked
Ray flowers 0–few; corolla ± purple
Disk flowers few–many; corollas radial or ± bilateral, white to ± purple, lobes narrowly triangular; anther tips triangular; style branches linear
Fruit 4-angled, narrowly obpyramidal; pappus of 4–10 scales
Species in genus: 12 species: sw US, Mex
Etymology: (J. Palafox, Spanish general, 1776–1847)
Reference: [Turner & Morris 1976 Rhodora 78:567–628]
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Annual
Stems generally erect, much-branched
Leaves 2–12 cm; petioles 5–15 mm; blades linear to linear-lanceolate
Inflorescence: heads discoid; cymes ± flat-topped; involucre cylindric or ± obconic; phyllaries linear, scabrous to densely glandular
Flowers 9–40; corollas white to pink; anthers pink to purple
Fruit 10–15 mm, ± strigose; pappus of outer achenes 0 or of 3–8 scales of varying length; pappus of inner achenes of 4 scales 8–12 mm and 4 shorter scales
Ecology: Sandy places
Elevation: < 1000 m.
Bioregional distribution: Desert
Distribution outside California: Nevada, Arizona, n Mexico
Synonyms: P. linearis (Cav.) Lag. misapplied
| 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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