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Salix irrorata Andersson
Dewystem willow

Life   Plantae   Dicotyledoneae   Salicaceae   Salix

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Associates · map
FamilyScientific name @ source (records)
Melampsoraceae  Melampsora abieti-capraearum @ BPI (3)

Melampsora bigelowii @ BPI (9)

Melampsora epitea @ BPI (1)

Melampsora ribesii-purpureae @ BPI (1)
Valsaceae  Cytospora nivea @ BPI (1)

Valsa nivea @ BPI (1)

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Salix irrorata Andersson
dewystem willow

General Information
Symbol: SAIR
Group: Dicot
Family: Salicaceae
Duration: Perennial
Growth Habit : Shrub
Native Status : L48   N
Data Source and Documentation
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Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   





Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Dilleniidae
Order Salicales
Family Salicaceae – Willow family
Genus Salix L. – willow
Species Salix irrorata Andersson – dewystem willow

Subordinate Taxa

This plant has no children

Legal Status

Wetland Status

Interpreting Wetland Status

North America
Arid West FACW
Great Plains FACW
Western Mountains, Valleys, and Coast FACW

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Native American Ethnobotany (University of Michigan - Dearborn) (SAIR)



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Description of Values

Value Class Food Cover

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Following modified from Flora of North America
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FNA Vol. 7 Page 95, 96, 98, 136, 153, 154 , 155 , 156 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 7 | Salicaceae | Salix

104. Salix irrorata Andersson, Öfvers. Kongl. Vetensk.-Akad. Förh. 15: 117. 1858.

Blue-stem or dewy-stemmed willow

Shrubs, 2-7 m, (multistemmed, sometimes forming clones by stem fragmentation). Stems: branches (highly brittle or not at base), red-brown to violet, usually glaucous, glabrous; branchlets yellow-brown, (strongly glaucous or not), glabrous, sparsely velvety, or tomentose. Leaves: stipules absent or rudimentary on early ones, foliaceous or rudimentary on late ones, apex acute; petiole convex to flat adaxially, 4-14 mm, velvety adaxially; largest medial blade lorate, narrowly oblong, narrowly elliptic, or narrowly oblanceolate, 47-115 × 8-22 mm, 3.5-7.7 times as long as wide, base cuneate or convex, margins flat to slightly revolute, entire and gland-dotted, serrulate or crenate, apex acuminate, acute, or convex, abaxial surface glaucous, glabrous, sparsely tomentose, or short-silky, hairs wavy, adaxial slightly to highly glossy, glabrous or pilose; proximal blade margins entire or serrulate; juvenile blade yellowish green or reddish, glabrous or sparsely villous abaxially, hairs white. Catkins flowering before or just before leaves emerge; staminate stout or subglobose, 15-34 × 8-22 mm, flowering branchlet 0(-2) mm; pistillate densely flowered, stout or slender, 14-43 × 7-12 mm, flowering branchlet 0-4 mm; floral bract brown or black, 1.3-2.5 mm, apex rounded, abaxially hairy, hairs straight or wavy. Staminate flowers: adaxial nectary narrowly oblong to oblong, 0.3-0.8 mm; filaments connate less than to more than 1/2 their lengths; anthers yellow or purple turning yellow, ellipsoid or shortly cylindrical, 0.4-0.7 mm. Pistillate flowers: adaxial nectary narrowly oblong to oblong, 0.3-0.7 mm; stipe 0.4-1 mm; ovary pyriform, beak slightly bulged below styles; ovules 9-12 per ovary; styles 0.3-0.9 mm; stigmas flat, abaxially non-papillate with rounded tip, 0.15-0.28-0.6 mm. Capsules 3.5-4 mm. 2 n = 38.

Flowering mid Mar-mid May. Streams, wet meadows; 1400-3000 m; Ariz., Colo., N.Mex., Wyo.; Mexico (Baja California, Chihuahua, Coahuila, Durango, Sonora).

Salix irrorata is very closely related to S. lasiolepis . The two are here maintained as separate species primarily because S. irrorata is a diploid and S. lasiolepis a tetraploid, and also because of their largely allopatric ranges (G. W. Argus 2007). Studies of sawflies ( Euura Newman) by P. W. Price (pers. comm.) show that the same species of Euura can successfully reproduce on either willow. The only morphological character that separates the two is that in S. irrorata branchlets and branches are very strongly glaucous, whereas in S. lasiolepis they are not glaucous. Some plants have weakly glaucous stems (wax not visible except by polishing or only as sparkling crystals); this may be infraspecific variability or evidence of hybridization.


Salix irrorata forms natural hybrids with S. drummondiana, S. geyeriana , and S. lasiolepis var. lasiolepis .

Salix irrorata × S. lasiolepis var. lasiolepis : This putative hybrid occurs in Arizona and New Mexico. It is characterized mainly by weakly glaucous branches.

Updated: 2019-11-14 06:49:03 gmt
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