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, in or near water; roots fibrous, from a taproot or not, generally from lower leaf axils as well
Stem generally soft
Leaves simple, opposite, ± 4-ranked; stipules scarious
Inflorescence: flowers axillary or terminal, solitary or clustered
Flowers small, inconspicuous, radial, bisexual; sepals and petals generally free, 3–5, equal in number; ovary spheric, styles 3–5, very short
Fruit: capsule, septicidal, ± spheric, ovoid, or depressed-ovoid, walls thin; chambers 2–5, each several–many-seeded
Seed very small; surface net-like or glossy
Genera in family: 2 genera, 50 species: ± worldwide
Reference: [Tucker 1986 J Arnold Arbor 67:471–483]
Annual, short-lived perennial herb, glabrous
Stem erect underwater, ± prostrate on wet ground, branched or not; base not woody
Leaves opposite, ± 4-ranked; petiole < 1/3 blade, flat, ± blade-like; blades narrowly elliptic to ± round, ± entire, bases wedge-shaped to ± rounded, tips rounded
Inflorescence: flowers 1(2) per node, 0–1 per upper leaf axil
Flower: sepals 3–4, widely elliptic, membranous, very pale green; petals generally as many as and ± = sepals, widely elliptic, membranous, pale greenish white; stamens 3, 6, 8, rarely 1, filaments ± 1/2 X to ± = petals, anthers widely ovoid; styles 3–4
Fruit ± spheric or depressed-ovoid; chambers 3–4, each 3–15- seeded; pedicel generally ± 0
Seeds ± visible through fruit wall, elliptic, straight or curved, brown to yellowish brown; surface net-like
Species in genus: ± 25 species: worldwide
Etymology: (Greek: fir tree, from a Eur sp. that suggests such a plant in miniature)
At least 20X magnification needed for pits on seeds.
| Native |
Stem decumbent to erect, 0.5–10 cm
Leaf narrowly oblong to widely elliptic, tapered to base; petiole < 1/4 blade
Inflorescence: flowers 1(2) per node
Flower: sepals 2 or, if 3, 1 < others; petals 3, ovate; stamens 3, opposite sepals
Fruit: chambers 3
Seeds 20–40 per chamber, elliptic, ± straight; pits 25–35 per row, wider than long
Ecology: Muddy shores of ponds
Elevation: ± 600–1700 m.
Bioregional distribution: n High Sierra Nevada, Modoc Plateau (Madeline Plains, Lassen Co.; Sierra Valley, Plumas Co.), Peninsular Ranges
Distribution outside California: temperate S.America
E. gracilis H. Mason, vernal pools, 1200 m, SN (Little Truckee River, Nevada Co.) differs only in fewer seeds per chamber, pits per row, and probably should be including here.
| 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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