|University of California, Berkeley|
|Directory News Site Map Home|
|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Indexes to all accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
[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 Aug 22 2014
Citation for this treatment: [Author of taxon treatment] 2013. Myriophyllum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=34273, accessed on Aug 22 2014
Copyright © 2014 Regents of the University of California
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.
|Geographic subdivisions indicated for the distribution of Myriophyllum sibiricum|| Markers link to CCH specimen records. If the markers are obscured, reload the page [or change window size and reload]. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
READ ABOUT YELLOW FLAGS
(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
View elevation by latitude chart
| Data provided by the participants of the Consortium of California Herbaria.
View all CCH records
CCH collections by month