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[Annual, shrub] perennial herb, generally aquatic or semiterrestrial, dioecious or monoecious. Leaf: cauline, opposite, alternate or whorled; submersed blades pinnately divided, segments thread-like; emergent leaves simple, entire to divided. Inflorescence: raceme, spike, or panicle; flowers 1 or clustered, short-pedicelled to ± sessile. Flower: generally unisexual, small; calyx tube short, fused to ovary, lobes 2–4; petals generally 2–4; stamens 4 or 8, filaments generally short; ovary inferior, chambers 1–4, styles 2–4, separate, stigmas generally plumose. Fruit: fleshy or of nut-like mericarps, dehiscent or not. Seed: generally 1 per chamber.
6–8 genera, ± 100 species: especially southern hemisphere, some cultivated. [Aiken & McNeill 1980 J Linn Soc Bot 80:213–222] Haloragis erecta (Murray) Eichler not naturalized in California. —Scientific Editor: Bruce G. Baldwin.
Plant from rhizomes, occasionally with overwintering buds (late in growing season); occasionally terrestrial. Stem: simple or branched, generally green. Leaf: submersed leaves generally whorled, 3–6 per node; emergent leaves entire to pinnately divided, occasionally bract-like. Inflorescence: generally emergent, spike-like, simple or branched, terminal, flowers in whorls. Flower: proximal pistillate, middle occasionally bisexual, distal staminate; calyx lobes 4; petals generally 4, ephemeral on staminate flowers, minute or 0 on pistillate flowers; stamens generally 8; ovary 4-chambered. Fruit: mericarps 4, nut-like.Key to Myriophyllum
± 60 species: worldwide. (Greek: many leaves, from leaf segments) [Ceska et al. 1986 Brittonia 38:73–81] Myriophyllum specimens best collected in flower or fruit.
Unabridged note: Plants should be washed first and then "floated" on the herbarium mounting paper in a shallow dish with water [see Ceska & Ceska 1987 Ann Missouri Bot Gard 73:825–827].
Monoecious; winter buds cylindrical, at ends of non-flowering branches, generally in fall. Stem: > 1 m, ± white or pink when dry. Leaf: submersed leaves 1–3 cm, segments linear, < 20 mm, <= 28 per leaf, angles, spacing varying throughout leaf. Inflorescence: spike, 3–8 cm, emergent; bracts 1–3 mm, < flowers, oblanceolate to ovate, entire to coarsely toothed.
Ponds, streams, lakes; < 2600 m. North Coast, Inner North Coast Ranges, High Cascade Range, n High Sierra Nevada, San Francisco Bay Area, Outer South Coast Ranges, South Coast, San Gabriel Mountains, San Bernardino Mountains, Peninsular Ranges, Modoc Plateau, w Mojave Desert; to Alaska, Canada, eastern United States, Eurasia. [Myriophyllum exalbescens Fernald] Jun–Sep [Online Interchange]
Unabridged synonyms: [Myriophyllum spicatum L. subsp. exalbescens (Fernald) Hultén; Myriophyllum spicatum L. var. exalbescens (Fernald) Jeps.]
Unabridged note: Recognizable by sparse leaf segments in blunt angles to leaf rachis and by cylindrical winter buds.
Previous taxon: Myriophyllum quitense
Next taxon: Myriophyllum spicatum
Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Mar 12 2014
Citation for this treatment: [Author of taxon treatment] 2012. Myriophyllum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=34273, accessed on Mar 12 2014
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