Directory       News       Site Map       Home
         
    Jepson eFlora: Taxon page
Key to families | Table of families and genera

Previous taxon 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 |
Previous taxon

ONAGRACEAE EVENING-PRIMROSE FAMILY

Warren L. Wagner & Peter C. Hoch, family description, key to genera; treatment of genera by Warren L. Wagner, except as noted

Annual to perennial herb (to tree). Leaf: cauline or basal, alternate, opposite, or whorled, generally simple and toothed (to pinnately compound); stipules 0 or generally deciduous. Inflorescence: spike, raceme, panicle, or flowers 1 in axils; bracted. Flower: generally bisexual, generally radial, often opening at either dawn or dusk; hypanthium generally prolonged beyond ovary (measured from ovary tip to sepal base); sepals 4(2–7); petals 4(2–7, rarely 0), often fading darker; stamens 2 × or = sepals in number, anthers 2-chambered, opening lengthwise, pollen interconnected by threads; ovary inferior, chambers generally as many as sepals (sometimes becoming 1), placentas axile or parietal, ovules 1–many per chamber, style 1, stigma 4-lobed (or lobes as many as sepals), club-shaped, spheric, or hemispheric. Fruit: capsule, loculicidal (sometimes berry or indehiscent and nut-like). Seed: sometimes winged or hair-tufted.
22 genera, ± 657 species: worldwide, especially western North America; many cultivated (Clarkia, Epilobium, Fuchsia, Oenothera). [Wagner et al. 2007 Syst Bot Monogr 83:1–240] Gaura moved to Oenothera. Fuchsia magellanica Lam. naturalized in northern California. —Scientific Editors: Robert Patterson, Bruce G. Baldwin.
Unabridged references: [Munz 1965 North America Fl II 5:1–278]

Key to Onagraceae

LUDWIGIA FALSE LOOSESTRIFE, WATER PRIMROSE

Peter C. Hoch & Brenda J. Grewell

Annual to subshrub or emergent aquatic, often floating, rooting at nodes. Leaf: alternate to opposite. Inflorescence: spike; flowers 1 per bract. Flower: radial; hypanthium 0; sepals 4–5(7), persistent; petals (0)4–5(7), white to yellow; stamens 4 or 10(12), pollen generally shed singly (in California); stigma club-shaped to spheric. Fruit: irregularly dehiscing; wall thick or thin. Seed: free or embedded in woody piece of fruit wall.
82 species: ± worldwide. (C.G. Ludwig, German botanist, physician, 1709–1773) [Raven 1963 Reinwardtia 6:327–427] Many polyploids.

Key to Ludwigia

L. peploides (Kunth) P.H. Raven
NATURALIZED
Perennial herb, matted, floating, or creeping. Stem: prostrate to erect, simple or branched. Leaf: alternate, ± clustered, (2)3–8(11) cm; blade oblong to round, ± entire, glabrous to spreading-hairy distally on stem. Inflorescence: bracts deltate. Flower: sepals (4)5(6); stamens (8)10(12) in 2 unequal sets, anthers 0.7–1.5 mm. Fruit: generally reflexed; body hard, ± glabrous to spreading-hairy. Seed: 1–1.5 mm, embedded in woody inner fruit wall.
2n=16. May be serious wetland weed. [Online Interchange]

L. peploides subsp. montevidensis (Spreng.) P.H. Raven
NATURALIZED
Plant (5)9–23(32) dm, ± spreading-hairy (except stem base), ± sticky when fresh. Stem: flower shoot floating, creeping, or erect. Leaf: tip generally mucronate; petioles (1)5–32(57) mm. Flower: sepals 6–14 mm, spreading-hairy; petals 4–6, 10–16(22) mm. Fruit: pedicels 7–38 mm; body (20)24–32 mm, cylindric, tapered to pedicel.
Lakeshores, streambanks, floodplains, seasonal wetlands; < 500 m. s North Coast, n&c Sierra Nevada Foothills, Great Central Valley, South Coast; southeastern United States (native?), Europe, Australia; native to southern South America. [Jussiaea repens L. var. montevidensis (Spreng.) Munz] May–Nov {Weed listed by Cal-IPC} [Online Interchange]

Previous taxon: Ludwigia peploides
Next taxon: Ludwigia peploides subsp. peploides

Contact/Feedback

Name search

Citation for the whole project: Jepson Flora Project (eds.) 2013. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on Oct 30 2014
Citation for this treatment: [Author of taxon treatment] 2013. Ludwigia, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=51358, accessed on Oct 30 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 Ludwigia peploides subsp. montevidensis 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
map of distribution 1
(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

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.