TREATMENT FROM THE JEPSON MANUAL (1993) |
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©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora. |
AND IS MAINTAINED FOR ARCHIVAL PURPOSES ONLY |
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 6many; pistils 6many, generally simple
Fruit: achene, generally compressed, beaked
Genera in family: ± 12 genera, 75100 species: especially n hemisphere
Reference: [Rogers 1983 J Arnold Arbor 64: 383420]
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 310 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 23.5 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 9:179233]
Some species weedy; tubers of some used for human and wildlife food.
Native |
Perennial; tubers spheric
Leaves: emergent blades 1425 cm, linear and 3-angled to narrowly ovate
Pistillate flower: pedicel recurved, thickened in fruit; sepals appressed in fruit
Staminate flower: filaments papillate
Fruit: side oil-streaked when fresh; beak < 0.5 mm, ascending to ± erect
Ecology: UNCOMMON. Ponds, ditches
Elevation: < 300 m.
Bioregional distribution: n North Coast (Del Norte Co.), Great Central Valley (where mostly extirpated), n South Coast (Ventura Co.).Threatened by development
Horticultural information: SUN, WET(fresh water): 4, 5, 7, 8, 9, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24.