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||
previous taxon |
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, perennial herb, shrub, tree
Leaves simple, cauline, opposite or whorled; stipules 0; blade often with black dots or embedded clear glands
Inflorescence: cyme, panicle, or flower solitary, terminal or axillary
Flower bisexual, radial; sepals persistent, generally 5, often fused at base, overlapping; petals generally 5, free; stamens generally many, free or ± fused into 35 clusters; pistil 1, ovary superior, chambers 13, placentas generally axile, style branches 3
Fruit: capsule, generally septicidal
Seeds many, small
Genera in family: 10 genera, 400 species: worldwide.
Annual, perennial herb, shrub, glabrous
Leaf sessile, ± gland-dotted
Inflorescence: generally cyme, generally terminal, bracted
Flower: sepals 5; petals 5, deciduous or persistent, yellow; anthers sometimes black-dotted; ovary chambers 1 or 3, placentas 3, axile or parietal and projecting into chamber
Species in genus: 350 species: worldwide
Etymology: (Greek name)
Perennial from taproot
Stems erect, many from base, 312 dm; sterile axillary branches generally 210 cm
Leaf 1.52.5 cm, linear to oblong; margins rolled under, black-dotted; lower surface conspicuously clear-dotted
Inflorescence: flowers generally 25100 per stem
Flower: sepals 45 mm, lanceolate, acuminate, with black and clear dots, margin glabrous; petal 812 mm, ± oblong, copiously black gland-dotted, twisting after flower, bright yellow; stamens many, in 3 clusters, anthers black-dotted; styles 46 mm
Fruit 78 mm, unlobed
Seed ± 1 mm, brown
Ecology: Pastures, abandoned fields, disturbed places
Elevation: < 1500 m.
Bioregional distribution: Northwestern California, High Cascade Range, n&c Sierra Nevada, Sacramento Valley, Central Coast, San Francisco Bay Area, Peninsular Ranges
Distribution outside California: to e N.America, native to Europe
May produce seed without fertilization.
Seriously TOXIC to livestock; the toxin hypericin inhibits human immunodeficiency virus. Weedy.
|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).|