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Salix exigua var. exigua

NARROW-LEAVED WILLOW, COYOTE WILLOW


Higher Taxonomy
Family: SalicaceaeView DescriptionDichotomous Key
Common Name: WILLOW FAMILY
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.
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
Reference: Argus 1997 Madroño 44:115--136
Unabridged Reference: Dorn, R. D. 1995. A taxonomic study of Salix section Cordatae subsection Luteae (Salicaceae). Brittonia 47: 160--174. Dorn, R. D. 1998. A taxonomic study of Salix section Longifoliae (Salicaceae) Brittonia 50: 193--210. Dorn, R. D. 2000. A taxonomic study of Salix sections Mexicanae and Viminella subsection Sitchenses (Salicaceae) in North America. Brittonia 52: 1--19.
Species: Salix exiguaView DescriptionDichotomous Key


Habit: Shrub or tree < 5 m, clonal by root-shoots. Stem: twigs yellow- to red-brown. Leaf: later stipules leaf-like; petiole 1--7 mm; mature blade 30--147 mm, linear or strap-shaped, acuminate (base wedge-shaped), entire or +- sparsely short-slender-serrate. Inflorescence: blooming with or after leaves, branched or not, pistillate 22--70 mm, on leafy shoots 2--70 (400) mm; flower bract +- tan; pistillate bracts deciduous. Staminate Flower: stamens 2; nectaries adaxial, abaxial. Pistillate Flower: ovary stalk 0.2--0.9 mm, stigma deciduous.

Salix exigua Nutt. var. exigua
NATIVE
Leaf: petiole densely short-soft-spreading-hairy; mature blade abaxial hairs generally densely long-soft-fine-silky, straight or wavy. Pistillate Flower: stigmas flat or wide-cylindric, 0.25--0.5 mm. Fruit: 4--8 mm. Chromosomes: 2n=38.
Ecology: Common. Shores, bars, silt, sand, gravel; Elevation: < 2800 m. Bioregional Distribution: SN, MP, D; Distribution Outside California: to British Columbia, Saskatchewan, South Dakota, Texas, Mexico. Flowering Time: Mar--Jun Note: Hybridizes with Salix exigua var. hindsiana, Salix sessilifolia (latter except from California since TJM (1993)).
Synonyms: Salix exigua var. nevadensis (S. Watson) C.K. Schneid.; Salix exigua var. stenophylla (Rydb.) C.K. Schneid.
Jepson eFlora Author: George W. Argus
Reference: Argus 1997 Madroño 44:115--136
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

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Botanical illustration including Salix exigua var. exiguabotanical illustration including Salix exigua var. exigua


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Citation for this treatment: George W. Argus 2012, Salix exigua var. exigua, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=76039, accessed on December 02, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on December 02, 2024.

Salix exigua  
var. exigua
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©2013 Neal Kramer

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Geographic subdivisions for Salix exigua var. exigua:
SN, MP, D
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