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, perennial herb, generally dioecious, wind-pollinated; epidermis with hardened hairs, glands, etc.; sap watery
Stem erect or twining
Leaves palmately compound or lobed, petioled; lower generally opposite (upper often less lobed, alternate)
Staminate inflorescence: panicle or spike-like cluster, ± open
Pistillate inflorescence: spike-, cone-, or head-like cluster of often paired flowers, dense
Staminate flower: perianth parts 5, free; stamens 5; pistil 0
Pistillate flower: perianth parts fused into a short, unlobed tube or ring; stamens 0; ovary superior, chamber 1, ovule 1, style 1, very short, stigmas 2, thread-like, plumose
Fruit: achene, generally ± enclosed in persistent perianth
Genera in family: 2 genera, 3 species: n hemisphere; cultivated, economically important
Reference: [Mitchell 1988 NY State Mus Bull 464:17–23]
Annual
Stem erect; hairs unbranched
Leaf generally palmately compound
Staminate inflorescence: panicle- or spike-like cluster, ± open
Pistillate inflorescence: spike-like cluster, erect to spreading, dense
Fruit sometimes ± enclosed in persistent perianth
Species in genus: 1–3 species: native range uncertain
Etymology: (Greek, Latin: hemp)
Reference: [Small & Cronquist 1976 Taxon 25:405–435]
| Introduced |
Stem branched, < 4 m; inner bark fibrous
Leaf: leaflets generally 3–7, < 15 cm, narrowly lanceolate, coarsely serrate
Staminate inflorescence > 15 cm
Pistillate inflorescence > 2 cm
Fruit 1–2 mm
Ecology: Disturbed or waste ground
Elevation: probably < 600 m.
Bioregional distribution: California Floristic Province
Distribution outside California: possibly native to c Asia, but cultivated since pre-history
Synonyms: C. indica Lam
Highly variable complex. Possession generally illegal due to psychoactive resin, tetrahydrocannabinol (THC) that is concentrated in pistillate inflorescences; used legally in medicine; stem fibers used for rope, fabric, paper, etc.
| 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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