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Epilobium torreyi

Higher Taxonomy
Family: OnagraceaeView DescriptionDichotomous Key

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

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

Epilobium torreyi (S. Watson) Hoch & P.H. Raven
Habit: Annual 0.4--6.5 dm, taprooted, +- gray spreading-hairy, peeling proximally. Leaf: opposite only near base (where glabrous), +- sessile, 5--45 mm, +- lance-linear, hairy. Inflorescence: glandular, bracts leaf-like. Flower: generally cleistogamous; hypanthium 0.4--1 mm; sepals 0.7--2 mm; petals 1--3.2 mm, pink or white; stigma club-like or rarely 4-lobed. Fruit: sessile, 8--14 mm, cylindric, beaked, flexible, dehiscent to base; axis disintegrating. Seed: 0.9--1.6 mm, netted; hair-tuft 0. Chromosomes: 2n=18.
Ecology: Seasonally moist streambanks, seeps, roadside ditches; Elevation: 50--2600 m. Bioregional Distribution: NW (exc NCo), CaR, SN, GV, SnFrB, SCoRO, MP, sw DMoj; Distribution Outside California: to British Columbia, Idaho, northern Nevada. Flowering Time: May--Aug
Synonyms: Boisduvalia stricta (A. Gray) Greene; Boisduvalia torreyi (S. Watson) S. Watson
eFlora Treatment Author: Peter C. Hoch
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botanical illustration including Epilobium torreyi


Citation for this treatment: Peter C. Hoch 2017. Epilobium torreyi, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 21, 2017.

Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora,, accessed on October 21, 2017.

Epilobium torreyi
click for enlargement
© 2010 Barry Breckling
Epilobium torreyi
click for enlargement
© 2004 Carol W. Witham
Epilobium torreyi
click for enlargement
© 2010 Barry Breckling
Epilobium torreyi
click for enlargement
© 2004 Carol W. Witham

More photos of Epilobium torreyi in CalPhotos

Geographic subdivisions for Epilobium torreyi:
NW (exc NCo), CaR, SN, GV, SnFrB, SCoRO, MP, sw DMoj;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
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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Data provided by the participants of the Consortium of California Herbaria.
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CCH collections by month

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