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Salix lasiolepis

Higher Taxonomy
Family: SalicaceaeView DescriptionDichotomous Key

Habit: Shrub, tree; dioecious (monoecious). Stem: trunk < 40 m; wood soft; bark smooth, bitter; buds scaly. Leaf: simple, alternate, deciduous; stipules generally present, deciduous or not, often large. Inflorescence: catkin [or various, or flowers 1]; each flower subtended by 1 bract. Flower: perianth modified into non-nectariferous, cup- or saucer-shaped structure or reduced to adaxial nectary (rarely also with abaxial nectary, then free or fused into shallow cup). Staminate Flower: stamens 2--many. Pistillate Flower: pistil 1, ovary superior to 1/2-inferior, chambers generally 2--4, placentas parietal, stigma lobes 2--4. Fruit: berry, drupe, or 2--4-valved capsule. Seed: often with basal tuft of hairs.
Genera In Family: 58 genera, 1210 species: widespread in tropics, northern temperate, arctic. Note: Now including many genera (e.g., Flacourtia, Idesia, Xylosma) formerly in Flacourtiaceae, at least in part because of presence on leaf margins in both families of salicoid teeth (vein extending to tooth tip). In California (and generally outside California), Populus pollinated by wind, Salix by insects, wind. Hybrids common; identification often difficult.
eFlora Treatment Author: John O. Sawyer, Jr., except as noted
Scientific Editor: Thomas J. Rosatti.
Genus: SalixView DescriptionDichotomous Key

Common Name: WILLOW
Habit: Shrub, tree; dioecious; bud scale 1, not sticky, margins generally fused (or free, overlapping). Stem: twigs generally flexible, generally not glaucous. Leaf: generally alternate; stipules generally vestigial on first leaves, leaf-like on later; mature blade linear to broadly obovate, entire to toothed, generally +- hairy; petiole glands generally 0. Inflorescence: catkin, blooming before, with, or after leaves, sessile or terminating +- short leafy or bracted shoot ("on leafy shoot" or "on bracted shoot," "catkin length" including leafless or bractless part of subtending shoot); 1 flower bract subtending each flower, deciduous or persistent, brown, black, or 2-colored (paler proximally, darker distally; darker generally +- brown). Flower: perianth reduced to adaxial nectary (rarely also with abaxial nectary, then free or fused into shallow cup). Staminate Flower: stamens (1)2(10); nectary generally 1. Pistillate Flower: ovary stalked or sessile, style generally 1, stigmas 2, each 2-lobed, deciduous or persistent; nectary generally 1, generally rod-like. Fruit: valves 2.
Species In Genus: +- 450 species: +- worldwide, especially northern temperate, arctic. Etymology: (Latin: ancient name) Note: Difficult, highly variable, many hybrids. Not all specimens key easily; sprouts, other extreme forms not included in keys, may require field comparisons. Studies of chromosome numbers, hybridization needed. Inclusion of Salix sessilifolia Nutt. in TJM (1993) based on misidentification of plants belonging to Salix melanopsis. Fruit length as given throughout excludes the stalk (stipe). Hair lengths: minute, < +- 0.5 mm; short, +- 0.5 mm; long, > +- 0.5 mm. Salix commutata Bebb, treated as misapplied to Salix eastwoodiae in TJM (1993), may occur in northern California mountains; Salix bonplandiana expected in s-most California. For alternate treatments, see Dorn (e.g., 2000 Brittonia 52:1--19).
eFlora Treatment Author: George W. Argus

Salix lasiolepis Benth.
Habit: Shrub, small tree, < 10 m. Stem: twigs +- yellow, yellow-green, or yellow- or red-brown, glabrous, densely short-soft-spreading-hairy, or tomentose, generally brittle at base. Leaf: later stipules generally leaf-like; petiole 3--16 mm, tomentose to velvety; young leaves white- or white-and-rusty-hairy; mature blade 35--125 mm, strap-shaped to elliptic or obovate, acute to convex (base wedge-shaped to convex), entire to irregularly serrate, +- to strongly rolled under, abaxially generally +- dense-tomentose or -woolly-tomentose or hairs sparsely short-soft-spreading or short- or long-silky, white or white and rusty, wavy, to +- 0. Inflorescence: blooming before leaves, pistillate 18--72 mm, on leafy shoots 0--6 mm; flower bract dark brown, with generally wavy hairs, tip broadly rounded. Staminate Flower: stamens 2. Pistillate Flower: ovary glabrous, stalk 0.5--2.4 mm, style 0.1--0.6 mm. Chromosomes: 2n=76.
Ecology: Abundant. Shores, marshes, meadows, springs, bluffs; Elevation: < 2800 m. Bioregional Distribution: CA; Distribution Outside California: to Washington, Idaho, Texas, Mexico. Flowering Time: Jan--Jun Note: Highly variable; several weak varieties described. NCo populations suggest intergradation with Salix hookeriana.
Synonyms: Salix lasiolepis var. bigelovii (Torr.) Bebb; Salix lasiolepis var. bracelinae C.R. Ball; Salix lasiolepis var. lasiolepis; Salix lasiolepis var. sandbergii (Rydb.) C.R. Ball; Salix lutea Nutt. var. nivaria Jeps.
eFlora Treatment Author: George W. Argus
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botanical illustration including Salix lasiolepis


Citation for this treatment: George W. Argus 2016. Salix lasiolepis, in Jepson Flora Project (eds.) Jepson eFlora,, accessed on October 23, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora,, accessed on October 23, 2016.

Salix lasiolepis
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© 2009 Neal Kramer
Salix lasiolepis
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© 2008 Keir Morse
Salix lasiolepis
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© 2009 Neal Kramer
Salix lasiolepis
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© 2001 Julie Kierstead Nelson
Salix lasiolepis
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© 2002 Tony Morosco
Salix lasiolepis
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© 2009 Neal Kramer

More photos of Salix lasiolepis in CalPhotos

Geographic subdivisions for Salix lasiolepis:
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.