Jepson Flora Project: Jepson Interchange    

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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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Charles E. Turner

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]



Perennial; caudex generally corm-like
Leaf: blade linear to ovate, tapered to base or petioled
Inflorescence: peduncle generally smooth; pedicels < 45 mm in fruit
Flower bisexual; receptacle generally flat; sepals generally 1–4 mm; petals ± entire to slightly cut, white or pink; stamens generally 6; pistils many, free, in 1 whorl
Fruit: body generally 1.5–3 mm, erect, generally strongly compressed, lateral walls opaque to translucent, back thin-ridged; beak < body, generally lateral
Species in genus: ± 9 species: generally n temp
Etymology: (Greek: ancient name)
Reference: [Bjorkqvist 1968 Opera Bot 19:1–138]
North America species need careful study.


A. gramineum Lej.

Leaf 6–30 cm; blade 3–7 cm, 0.8–2 cm wide, linear to narrowly lanceolate, base tapered
Inflorescence < to barely > leaves; pedicels generally spreading to recurved
Flower: petals white or pink; style ± curved
Fruit: lateral walls generally thick, opaque
Chromosomes: 2n=14
Ecology: Ponds, ditches
Elevation: 1200–1800 m.
Bioregional distribution: Modoc Plateau
Distribution outside California: to Canada, e US, Eurasia
Synonyms: A. geyeri Nicollet
Horticultural information: TRY.
See the CNPS Inventory for information about endangerment and rarity.
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bioregional map for ALISMA%20gramineum being generated
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).

Retrieve Jepson Interchange Index to Plant Names entry for Alisma gramineum
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