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
Stem prostrate to erect
Leaves alternate or opposite, simple, generally entire, bract-like upward; stipules 0
Inflorescence: cymes, often arrayed ± in spikes or panicles; bracts 1–3 per flower, generally membranous-scarious, tip often short-pointed or spine-like
Flower generally small, uni- or bisexual, radial; sepals 0–5, fused at base or free, often ± scarious; petals 0; stamens 0–5, opposite sepals (staminodes sometimes alternating), filaments sometimes fused at base; ovary superior, 1-chambered, ovules 1–several, erect or pendent on ± basal stalks, styles 0–3, stigma head-like or 2–3-lobed
Fruit: utricle to circumscissile capsule
Seed lenticular to spheric, hard
Genera in family: ± 65 genera, ± 900 species: tropical, subtropical
Reference: [Robertson 1981 J Arnold Arbor 62:267–313]
Annual to subshrub, ± mounded; hairs short, branched
Leaves entire, often asymmetric, petioled; lowest alternate to opposite; upper opposite or whorled in 3's, generally reduced, larger falling early
Inflorescence: clusters of 1–5 flowers, axillary, sessile, subtended and ± enclosed by involucres of 2–3 bract-like leaves that become hardened; bracts scarious
Flower bisexual; sepals 5, 1–1.5 mm, 1-veined, glabrous inside, sometimes canescent outside, reflexed, inner scarious-margined; stamens 5, filaments fused below into a cup, alternate 5 short staminodes; ovary spheric, style 1, short, stigma head-like or 2-lobed
Fruit indehiscent; wall membranous
Seed obovoid, brown
Species in genus: 7 species: w North America deserts
Etymology: (Ivar T. Tidestrom, Swedish-born botanist of sw US, 1864–1956)
| Native |
Annual 1–9 dm, < or = 20 dm wide
Leaves: upper << lower; young terminal leaves white-gray, tomentose-canescent, hairs short, much-branched, wearing off, older leaves green above, more whitish below; blades 6–22 mm, (ob)ovate, base wedge-shaped
Flower: sepals 1.8–2.6 mm; filament tube 0.3–0.4 mm, free filaments 0.6–1.6 mm
Ecology: Slopes
Elevation: ± 1200 m.
Bioregional distribution: e Desert Mountains (Granite Mtns)
Distribution outside California: to Colorado, Texas, Mexico
Flowering time: Jul–Oct
| 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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