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Salix maccalliana Rowlee
Life   Plantae   Dicotyledoneae   Salicaceae   Salix

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Salix maccalliana Rowlee
McCalla's willow

General Information
Symbol: SAMA12
Group: Dicot
Family: Salicaceae
Duration: Perennial
Growth Habit : Tree
Native Status : CAN   N
L48   N
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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 maccalliana Rowlee – McCalla's willow

Subordinate Taxa

This plant has no children

Legal Status

Threatened and Endangered Information:
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete protected plant list for that location.
Washington Maccall's willow Sensitive

Wetland Status

Interpreting Wetland Status

North America
Arid West FACW
Great Plains OBL
Midwest OBL
Northcentral & Northeast OBL
Western Mountains, Valleys, and Coast FACW

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Source Large Mammals Small Mammals Water Birds Terrestrial Birds


Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover

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Following modified from Flora of North America
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Link to Flora of North America home
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FNA Vol. 7 Page 27, 39, 45 , 49 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 7 | Salicaceae | Salix

15. Salix maccalliana Rowlee, Bull. Torrey Bot. Club. 34: 158. 1907.

MacCalla's willow

Stems: branches dark red-brown, slightly or highly glossy, glabrous; branchlets red-brown or yellow-brown, puberulent to glabrescent, hairs wavy, curved, straight, or geniculate. Leaves: stipules absent or rudimentary on early ones; petiole convex to flat, or shallowly grooved adaxially, 4-15 mm, pilose or pubescent adaxially; largest medial blade lorate or narrowly oblong, 40-85 × 8-25 mm, 2.9-4.8(-5.7) times as long as wide, base convex or cuneate, margins flat, entire, serrulate, or crenate, apex acute to sometimes acuminate, abaxial surface (pale), glabrous or sparsely pubescent, hairs white and ferruginous, straight, relatively short and stiff, adaxial highly glossy, glabrous, puberulent, or sparsely tomentose, hairs white and ferruginous; proximal blade margins serrulate; juvenile blade reddish. Catkins: staminate (stout or subglobose), 15.5-42 × 9-16 mm, flowering branchlet 1.5-11 mm; pistillate densely flowered, slender, stout, or subglobose, 25-50 × 10-20 mm, flowering branchlet 3-12 mm; floral bract 1.6-3.6 mm, apex rounded to truncate, entire, abaxially hairy throughout or proximally, hairs white and ferruginous, wavy. Staminate flowers: abaxial nectary (0-)0.6-0.9 mm, adaxial nectary oblong or narrowly oblong, 0.5-1 mm, nectaries distinct or connate and cup-shaped; filaments distinct, hairy on proximal 1/2; anthers (purple turning yellow), ellipsoid or shortly cylindrical. Pistillate flowers: (abaxial nectary present), adaxial nectary oblong, 0.4-1 mm, (nectaries distinct); ovary pyriform; ovules 12-16 per ovary; styles connate or distinct 1/2 their lengths, 0.8-1.2 mm; stigmas flat, abaxially non-papillate with rounded tip, or slenderly cylindrical, 0.3-0.6 mm. Capsules 7-11 mm. 2 n = ca. 190, ca. 228.

Flowering early May-early Jul. Sedge meadows, shrubby fens, marly or bouldery lakeshores, string bogs, treed bogs, Calamagrostis grasslands; 0-1500 m; Alta., B.C., Man., N.W.T., Ont., Que., Sask., Yukon; Minn., N.Dak., Wash.

The decaploid to dodecaploid chromosome number for Salix maccalliana , highest in the genus, suggests a complex origin. Relationships with subg. Chamaetia and subg. Salix were suggested by Rowlee and by H. M. Raup (1959). Staminate flowers with abaxial nectaries, tawny and persistent bracts, and villous ovaries suggest a link with S. glauca ; leaves with coarse, ferruginous hairs and serrate margins suggest S. lucida (Rowlee). Although S. maccalliana is phenetically closer to sect. Salicaster than to (subg. Chamaetia ) sect. Glaucae (G. W. Argus 1997), it is probable that because it incorporates genomes from more than one subgenus, its subgeneric placement is arbitrary.

Updated: 2019-10-24 05:19:07 gmt
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