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 (soft-wooded) trees, glabrous or stinging-hairy, monoecious or dioecious
Leaves alternate or opposite, generally stipuled, petioled, often with embedded crystals
Inflorescence various, axillary
Flowers generally unisexual, small, greenish; sepals generally 4–5, free to fused; petals 0
Staminate flower: stamens generally 4–5, opposite sepals, in bud incurved, then springing out
Pistillate flower: ovary 1, superior, chamber 1, style 0–1, stigma 1, generally hair-tufted
Fruit: generally achene (drupe)
Genera in family: 50 genera, 700 species: worldwide; some cultivated (Boehmeria ; Pilea , clearweed)
Reference: [Miller 1971 J Arnold Arb 52:40–68]
Wind-pollinated.
Annual to shrub, weak, stinging-hairy or not, monoecious or dioecious
Leaves opposite, lanceolate to cordate, toothed, prominently 3–5-veined from base; crystals round to elongate
Inflorescence head-, raceme-, or panicle-like
Staminate flower: sepals 4, ± free, green, sharp-bristly; stamens 4
Pistillate flower: sepals 4, ± free, outer 2 < inner 2
Fruit lenticular to deltate, enclosed by 2 inner sepals
Species in genus: ± 50 species: especially temp
Etymology: (Latin: to burn, from stinging hairs)
Reference: [Woodland 1982 Syst Bot 7:282–290]
| Introduced |
Annual 1–6 dm, from slender taproot, monoecious; nonstinging hairs 0 to moderate
Leaf: blade generally < 40 mm, elliptic to ± ovate, base tapered to rounded
Inflorescence generally ± head- (spike-) like, 5–25 mm, often < petiole, with staminate and pistillate flowers
Fruit 1.5–2.5 mm, deltate
Chromosomes: 2n=24,26,52
Ecology: Waste areas, gardens, orchards
Elevation: generally < 3000 m.
Bioregional distribution: California Floristic Province (± except Northwestern California, High Cascade Range)
Distribution outside California: native to Europe
| 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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