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Vascular Plants of California
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Epilobium pallidum


Higher Taxonomy
Family: OnagraceaeView DescriptionDichotomous Key
Common Name: EVENING-PRIMROSE FAMILY
Habit: 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.
Genera In Family: 22 genera, +- 657 species: worldwide, especially western North America; many cultivated (Clarkia, Epilobium, Fuchsia, Oenothera). Note: Gaura moved to Oenothera. Fuchsia magellanica Lam. naturalized in northern California.
eFlora Treatment Author: Warren L. Wagner & Peter C. Hoch, family description, key to genera, treatment of genera by Warren L. Wagner, except as noted
Scientific Editor: Robert Patterson, Bruce G. Baldwin.
Genus: EpilobiumView DescriptionDichotomous Key


Common Name: WILLOWHERB
Habit: Annual to subshrub. Leaf: generally opposite proximally (or clustered in axils), generally +- fine-toothed; veins generally obscure. Inflorescence: generally raceme, bracted. Flower: radial or rarely +- bilateral; sepals 4, erect; petals 4, notched; stamens 8, anthers attached at middle, pollen grains generally shed in 4s, cream-yellow; ovary chambers 4, stigma generally club-like, occasionally 4-lobed. Fruit: straight, cylindric to club-like. Seed: generally in 1 row per chamber, generally with white, deciduous hair-tuft.
Species In Genus: 165 species: worldwide except tropics. Etymology: (Greek: upon pod, from inferior ovary) Note: Incl Boisduvalia, Zauschneria. Most taxa polyploid; many with anthers +- = stigma self-pollinated; many hybrids. Taxa with alternate leaves moved to Chamerion.
eFlora Treatment Author: Peter C. Hoch
Reference: Raven 1976 Ann Missouri Bot Gard 63:326--340; Wagner et al. 2007 Syst Bot Monogr 83:81--95
Epilobium pallidum (Eastw.) Hoch & P.H. Raven
NATIVE
Habit: Annual 0.5--6 dm, stem peeling proximally, densely spreading-hairy or strigose. Leaf: opposite only at base, 12--50 mm, narrowly lance-elliptic, glabrous (distal hairy), +- sessile. Inflorescence: crowded spike, sometimes glandular; bracts = leaves. Flower: hypanthium 1.5--3 mm; sepals 2--6 mm; petals 3--10 mm, rose-purple; stamens <= pistil; stigma 4-lobed. Fruit: 10--21 mm, beaked, +- spreading-hairy, pliable, sessile, dehiscent to base; septa and axis disintegrating. Seed: compressed into 1 staggered row per capsule, 1.8--2.3 mm, netted, glabrous, hair-tuft 0. Chromosomes: 2n=20.
Ecology: Edges of seasonally moist ponds, streams; Elevation: 60--2050 m. Bioregional Distribution: KR, NCoRI, CaR, n SN, ScV, MP; Distribution Outside California: to southwestern Oregon, Idaho. Flowering Time: May--Aug
Synonyms: Boisduvalia pallida Eastw.; Boisduvalia macrantha A. Heller
Jepson eFlora Author: Peter C. Hoch
Reference: Raven 1976 Ann Missouri Bot Gard 63:326--340; Wagner et al. 2007 Syst Bot Monogr 83:81--95
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Botanical illustration including Epilobium pallidum

botanical illustration including Epilobium pallidum

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Citation for this treatment: Peter C. Hoch 2012, Epilobium pallidum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=76886, accessed on November 12, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on November 12, 2019.

Epilobium pallidum
click for enlargement
© 2005 George W. Hartwell
Epilobium pallidum
click for enlargement
© 2005 George W. Hartwell

More photos of Epilobium pallidum in CalPhotos



Geographic subdivisions for Epilobium pallidum:
KR, NCoRI, CaR, n SN, ScV, MP
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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).





 

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All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time.