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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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ONAGRACEAE

EVENING PRIMROSE FAMILY

Warren L. Wagner, except as specified Peter H. Raven, Family Coordinator

Annual to tree
Leaves basal or cauline, alternate, opposite, or whorled, generally simple and toothed (to pinnately compound); stipules 0 or generally deciduous
Inflorescence: spike, raceme, panicle, or flowers solitary in axils; bracted
Flower generally bisexual, generally radial, opening at dawn or dusk; hypanthium sometimes prolonged beyond ovary (measured from ovary tip to sepal base); sepals generally 4(2–7); petals generally 4 (or as many as sepals, rarely 0), often "fading" darker; stamens generally 4 or 8(2), anthers 2-chambered, opening lengthwise, pollen generally interconnected by threads; ovary inferior, chambers generally 4 (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, or hemispheric
Fruit: capsule, loculicidal (sometimes berry or indehiscent and nut-like)
Seeds sometimes winged or hair-tufted
Genera in family: 15 genera, ± 650 species: worldwide, especially w North America; many cultivated (Clarkia, Epilobium, Fuchsia, Gaura, Oenothera )
Reference: [Munz 1965 North America Fl II 5:1–278]

LUDWIGIA

FALSE LOOSESTRIFE, WATER PRIMROSE

Peter C. Hoch

Annual to subshrub, sometimes floating or rooting at nodes
Leaves alternate to opposite, simple; stipules generally deciduous
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 CA; stigma club-shaped to spheric
Fruit dehiscing irregularly; wall thick or thin
Seeds free or embedded in fruit wall
Species in genus: 82 species: ± worldwide
Etymology: (C.G. Ludwig, German botanist and physician, 1709–1773)
Reference: [Raven 1963 Reinwardtia 6:327–427]
Many polyploids.

Native

L. repens J.R. Forst.

Perennial, matted
Stem 1–3 dm, decumbent, rooting at nodes, ± branched, subglabrous
Leaves opposite, < 5 cm; blade narrowly elliptic to ± round, entire, subglabrous to densely and minutely strigose
Flower: sepals 4, 1.8–5 mm; petals 4, 1–3 mm, yellow; stamens 4, anthers 0.4–0.9 mm, pollen shed ± in 4's
Fruit erect; pedicel 0–3 mm; body 4–10 mm, oblong to narrowly obconic, sometimes ± hairy
Seed 0.6–0.8 mm, free of fruit wall
Chromosomes: 2n=32
Ecology: Muddy or sandy streambanks, ponds, ditches
Elevation: < 900 m.
Bioregional distribution: San Bernardino Mountains, Peninsular Ranges, sw Mojave Desert
Distribution outside California: to se US, Caribbean, n Mexico, introduced into s Asia, Japan
Flowering time: Jul–Sep
Synonyms: L. natans Elliott var. stipitata Fernald & Griscom
Horticultural information: INV; STBL.

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bioregional map for LUDWIGIA%20repens being generated
 
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Retrieve Jepson Interchange Index to Plant Names entry for Ludwigia repens
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