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]
| Native |
Perennial 10–30 dm, from rhizome, ± erect
Leaf: blade generally > 40 mm, narrowly lanceolate to widely ovate, base tapered to cordate
Inflorescence spike-, raceme-, or panicle-like, 1–7 cm, generally > petiole, with only staminate or pistillate flowers
Fruit ovate
Ecology: Streambanks, margins of deciduous woodlands, moist waste places
Elevation: < 3000 m.
Bioregional distribution: California Floristic Province, White and Inyo Mountains, Desert Mountains
Distribution outside California: US, Canada, n Mexico, Eurasia
Ssp. d. dioecious, native to Eurasia; naturalized in North America including CA.
| Native |
Generally monoecious
Stem 10–30 dm, gray-green; nonstinging hairs (stem and lower leaf surface) moderate to dense
Chromosomes: 2n=26
Ecology: Habitats of sp.
Elevation: < 3000 m.
Bioregional distribution: California Floristic Province (± except Northwestern California), White and Inyo Mountains, Desert Mountains
Distribution outside California: w US, n Mexico
Flowering time: Jun–Sep
Synonyms: U. h. Nutt.; U. serra Blume misapplied
| 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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