Jepson Interchange (more information)
For up-to-date information about California vascular plants, visit the Jepson eFlora.
| Jepson Flora Project: Jepson Interchange |
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TREATMENT FROM THE JEPSON MANUAL (1993) |
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Jepson Interchange (more information) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
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.
Perennial, often matted, dioecious; staminate plants generally present
Leaves alternate, entire, generally ± tomentose
Inflorescence: heads discoid or disciform, 1 or in cyme-like clusters; phyllaries many in several series, papery or membranous (staminate wider, more conspicuous); receptacle naked
Staminate flowers 2–5 mm; corollas white, yellow, or red; pappus bristle tips generally enlarged
Pistillate flowers 2–10 mm; corollas barely lobed, white, yellow or red
Fruit 0.5–3.5 mm, ± elliptic; pappus bristles many, soft, weakly barbed
Species in genus: ± 40 species: Am, n Eurasia
Etymology: (Latin: antenna)
Reference: [Bayer 1990 Can J Bot 68:1389–1397 and Madroño 37:171–183]
Many races reproduce by asexual seeds, their populations entirely pistillate plants.
| Native |
Stems 5–13 cm; stolons many, matted
Leaves: basal 6–19 mm, ± linear to spoon-shaped, 1-veined, densely woolly; cauline 5–20 mm, linear
Inflorescence: heads 2–7; involucres 4–8 mm, base woolly; phyllaries narrow and acute (pistillate) or wide and blunt (staminate), upper part dark brownish black
Staminate flowers: corollas 2.8–4.5 mm
Pistillate flowers: corollas 3–4.5 mm
Fruit 0.6–1.6 mm, papillate or smooth; pappus 4–5.5 mm
Chromosomes: 2n=56,98,112
Ecology: High meadows, snow basins, ridges
Elevation: 1800–3900 m.
Bioregional distribution: Klamath Ranges, High North Coast Ranges, High Cascade Range, High Sierra Nevada, San Bernardino Mountains, White and Inyo Mountains
Distribution outside California: to sw Canada, Montana, Colorado, New Mexico
Flowering time: Jul–Aug
Synonyms: A. alpina (L.) Gaertn. var. m. (Greene) JepsHorticultural information: DRN, IRR, SUN: 1, 2, 3, 7, 14, 15, 16, 17; DFCLT.
| 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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