Jepson eFlora: Taxon page
Vascular Plants of California
Key to families | Table of families and genera
Previous taxon Index to 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 |
Next taxon


Epilobium densiflorum


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 densiflorum (Lindl.) Hoch & P.H. Raven
NATIVE
Habit: Annual 0.5--15 dm, simple or branched distally, peeling proximally, spreading hairy or strigose. Leaf: opposite only near base, +- sessile, 14--85 mm, (narrowly) lanceolate to sublinear; distal leaves hairy. Inflorescence: leafy, +- dense spike, sometimes glandular. Flower: hypanthium 1.3--4 mm; sepals 2--8 mm; petals 3--10 mm, rose-purple to white; stigma head-like to irregularly 4-lobed. Fruit: 4--11 mm, cylindric, pliable, not beaked, dehiscent to base; axis persistent; pedicel 0--2.5 mm. Seed: 1.2--1.6(1.9) mm, netted, glabrous, hair-tuft 0. Chromosomes: 2n=20.
Ecology: Streambanks, outwashes, seasonal moist flats; Elevation: < 2600 m. Bioregional Distribution: CA-FP (exc SCo, ChI), MP; Distribution Outside California: to British Columbia, Montana, Arizona, northern Baja California. Flowering Time: May--Oct Note: Highly variable.
Unabridged Synonyms: Boisduvalia densiflora (Lindl.) S. Watson; Boisduvalia densiflora var. pallescens Suksd.; Boisduvalia densiflora var. salicina (Rydb.) Munz
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
Jepson Online Interchange

Previous taxon: Epilobium cleistogamum
Next taxon: Epilobium foliosum

Name Search

Botanical illustration including Epilobium densiflorum

botanical illustration including Epilobium densiflorum

Contact/Feedback

Citation for this treatment: Peter C. Hoch 2012, Epilobium densiflorum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=76884, accessed on November 14, 2019.

Citation for the whole project: Jepson Flora Project (eds.) 2019, Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on November 14, 2019.

Epilobium densiflorum
click for enlargement
© 2015 Neal Kramer
Epilobium densiflorum
click for enlargement
© 2019 Barry Breckling
Epilobium densiflorum
click for enlargement
© 2010 George W. Hartwell
Epilobium densiflorum
click for enlargement
© 2006 George W. Hartwell
Epilobium densiflorum
click for enlargement
© 2016 Neal Kramer
Epilobium densiflorum
click for enlargement
© 2008 Keir Morse

More photos of Epilobium densiflorum in CalPhotos



Geographic subdivisions for Epilobium densiflorum:
CA-FP (exc SCo, ChI), MP
MAP CONTROLS
1. You can change the display of the base map and layers by clicking on the layer control box in the upper right-hand corner.
2. California county polygons can be turned off and on in the layer control box.
3. Filling of Jepson subdivision polygons can be turned off and on in the layer control box.
4. Marker clustering can be turned on by clicking this link:      Marker Clustering ON
WARNING: This page may load slowly if there are large numbers of specimens in the database.
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.
MAP LEGEND
View all CCH records
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.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.
READ ABOUT YELLOW FLAGS


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.