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 from corms, stolons, rhizomes, or tubers, aquatic (± emergent or on mud), generally bisexual; roots fibrous
Stem: caudex short
Leaves: basal, simple, palmately veined, sometimes floating; submersed blades generally linear to ovate; emergent blades linear to sagittate
Inflorescence generally scapose, umbel- to panicle-like; flowers whorled, in interrupted clusters
Flowers bisexual or unisexual, radial; sepals 3, generally green, generally persistent; petals 3, generally > sepals, white or pink; stamens 6–many; pistils 6–many, generally simple
Fruit: achene, generally compressed, beaked
Genera in family: ± 12 genera, 75–100 species: especially n hemisphere
Reference: [Rogers 1983 J Arnold Arbor 64: 383–420]
Annual, perennial herb, generally monoecious; roots partitioned
Leaves: petiole unangled; submerged blades tapered to base; floating or emergent blades generally sagittate (or linear to ovate)
Inflorescence: lowest node generally with 3 pistillate flowers; staminate flowers above
Flowers generally unisexual; sepals 3–10 mm, reflexed to appressed in fruit; petals generally entire
Pistillate flower: receptacle convex; pistils many, in spheric cluster
Staminate flower: stamens many
Fruit: body generally 2–3.5 mm, strongly compressed, back winged or ridged; beak generally lateral, spreading or erect
Species in genus: ± 20 species: worldwide, especially Am
Etymology: (Latin: arrow, from leaf shape)
Reference: [Bogin 1955 Mem NY Bot Gard 9:179–233]
Some species weedy; tubers of some used for human and wildlife food.
| Native |
Annual; flowers bisexual and staminate on same plant
Leaves: emergent blades 5–15 cm, sagittate, lower lobes ± = terminal lobe
Inflorescence: lowest node with 2 bisexual flowers
Bisexual flower: pedicel recurved, thickened in fruit; sepals appressed in fruit; petals white, with green-yellow spot at base
Staminate flower: filaments papillate
Fruit: side oil-streaked when fresh; beak 0.5–1.5 mm, spreading
Ecology: Ponds, ditches, rice fields
Elevation: < 300 m.
Bioregional distribution: Great Central Valley, San Francisco Bay Area (Sonoma Co.), c South Coast (Los Angeles Co.)
Distribution outside California: to e US, n Mexico
Ssp. m. in South AmericaHorticultural information: TRY.
| 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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