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|
Shrub or tree-like, densely branched, generally dioecious
Stem generally erect, < 2 m, jointed; node conspicuous, internode > leaf; bark with irregular, longitudinal cracks, generally gray; twigs whorled, grooved, greenish and photosynthetic when young, glaucous, glabrous to scabrous, sometimes thorn-like
Leaves 23 per node, not green; bases ± fused into sheath, thickening with age; tips often ± deciduous
Pollen cones 15 per node, generally short-stalked, generally spheric; bracts generally flexible, lower sterile, upper subtending 28 stamen-like structures
Seed cones generally 13 per node, sessile or stalk < 5 mm; bracts generally flexible, lower sterile, upper enclosing 13 seeds
Seed spheric to cylindric, smooth or furrowed, generally angled at top, generally brown
Genera in family: 1 genus, 42 species: North America, South America, Medit, Asia
Reference: [Cutler 1939 Ann Mo Bot Gar 26:373424]
Etymology: (Greek: Equisetum , for resemblance to those plants)
Stem < 1.5 m; twig yellow-green when young, aging gray-brown, tip not thorn-like
Leaves 3 per node, < 6 mm, with whitish margins wearing away to leave brown, thickened bases with recurved tips
Pollen cones 13 per node, < 9 mm
Seed cones < 12 mm, ovoid, short-stalked
Seed generally 1, < 10 mm, ± spheric, smooth, not or faintly 4-angled
Ecology: Scattered in arid grassland, chaparral, creosote-bush scrub
Elevation: < 900 m.
Bioregional distribution: s Sierra Nevada Foothills, Tehachapi Mountain Area, w San Joaquin Valley, South Coast Ranges, Southwestern California, Desert
Distribution outside California: to w Arizona, Baja California
Horticultural information: DRN, DRY, SUN: 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.
|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).|