Jepson Interchange (more information)
Print edition is available from the University of California Press
|
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 |
next 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 |
Annual or perennial herb, often rhizomed, often of wet open places, generally monoecious; roots fibrous, hairy
Stem generally 3-sided
Leaves often 3-ranked; sheath generally closed; ligule generally 0; blade (0) various, parallel-veined
Inflorescence: spikelets variously clustered; flowers generally sessile in axil of flower bract
Flower small, generally wind-pollinated; perianth 0 or bristle-like; stamens generally 3, anthers attached at base, 4-chambered; ovary superior, 1-chambered, 1-ovuled, style 2–3-branched
Fruit: achene, generally 3-sided
Genera in family: ± 110 genera, 3600 species: worldwide, especially temp
Reference: [Tucker 1987 J Arnold Arbor 68:361–445]
Difficult: taxa differ in technical characters of inflorescence and fruit.
Annual or perennial herb
Stem generally round, ridged and grooved, generally solid
Leaves basal, 1(–4); base sheathing; blade generally 0
Inflorescence: spikelet solitary, terminal, erect; spikelet bract 0; flower bracts generally spiraled
Flowers bisexual; perianth bristles 0–6, persistent, barbs generally recurved; stamens (1–)3; style 2–3-branched, base bulb-like, persistent
Fruit 2–3-sided or round; top tubercled
Species in genus: ± 250 species: worldwide
Etymology: (Greek: marsh grace)
St shape best seen in fresh material (or just below spikelet); drying exaggerates ridges and grooves.
| Native |
Annual < 5 dm
Stem spongy, flattened in pressing
Leaf purplish below, becoming straw-colored above; tip oblique, entire
Inflorescence: spikelet 2–16 mm, often wider than stem, oblong to ± round, tip obtuse, generally 10–many-flowered; flower bract ovate, brownish, tip obtuse to acute
Flower: style 2-branched
Fruit: perianth bristles < to > fruit; body ± 1–1.5 mm, ± obovoid, 2-sided, (pale) brown, shiny; tubercle flat, base not narrowed
Chromosomes: 2n=10
Ecology: Wet soil of pond and lake margins, marshes, often yellow-pine forests
Elevation: < 2600 m.
Bioregional distribution: Northwestern California, Sierra Nevada, Modoc Plateau
Distribution outside California: to British Columbia, Idaho, e N.America
Also e North America, with other vars.
| Native |
Inflorescence: spikelet 5–16 mm, oblong to ovate
Fruit: perianth bristles < to = fruit; tubercle < 1/4 fruit body
Ecology:Habitats of sp.
Bioregional distribution: s Northwestern California (Marin, Lake cos.), Sierra Nevada, n Modoc Plateau
Distribution outside California: to Washington, e N.America
| 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). |
|