Salix maccalliana

Rowlee

Bull. Torrey Bot. Club 34: 158. 1907.

Common names: MacCalla’s willow
IllustratedEndemic
Treatment appears in FNA Volume 7. Treatment on page 49. Mentioned on page 27, 39.

Stems: branches dark redbrown, slightly or highly glossy, glabrous; branchlets redbrown or yellowbrown, 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 cupshaped; 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. 2n = ca. 190, ca. 228.


Phenology: Flowering early May-early Jul.
Habitat: Sedge meadows, shrubby fens, marly or bouldery lakeshores, string bogs, treed bogs, Calamagrostis grasslands
Elevation: 0-1500 m

Distribution

V7 41-distribution-map.gif

Alta., B.C., Man., N.W.T., Ont., Que., Sask., Yukon, Minn., N.Dak., Wash.

Discussion

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.

Selected References

None.

Lower Taxa

None.

... more about "Salix maccalliana"
228 +  and 190 +
0 cm0 mm <br />0 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
pubescent +  and glabrous +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
tomentose;puberulent;tomentose;puberulent;glabrous +
reddish turning yellow +  and yellow +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
George W. Argus +
Rowlee +
cuneate +  and convex +
tapering +
ferruginous +  and white +
tomentose +  and short-silky +
toothed +  and 2-fid +
persistent +  and deciduous +
dark redbrown +
flowered +  and sessile +
puberulent +  and glabrescent +
subglobose +
slender +  and stout +
0.3 cm3 mm <br />0.003 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
flowered +, pistillate +  and staminate +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
pendulous +, spreading +  and erect +
subglobose +
slender +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
MacCalla’s willow +
Alta. +, B.C. +, Man. +, N.W.T. +, Ont. +, Que. +, Sask. +, Yukon +, Minn. +, N.Dak. +  and Wash. +
0-1500 m +
greenish +  and tawny +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.36 cm3.6 mm <br />0.0036 m <br />) +
pistillate +  and staminate +
bisexual +  and unisexual +
spherical +
Sedge meadows, shrubby fens, marly or bouldery lakeshores, string bogs, treed bogs, Calamagrostis grasslands +
white and ferruginous +
straight +  and curved +
wavy +  and geniculate +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
amphistomatous +  and hypostomatous +
4 cm40 mm <br />0.04 m <br /> (8.5 cm85 mm <br />0.085 m <br />) +
oblong +  and lorate +
0.8 cm8 mm <br />0.008 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
crenate +  and serrulate +
connate +  and distinct +
rudimentary +
2-7[-10]-carpellate +
pyriform +
glandular-dotted +
pubescent +  and pilose +
convex;flat +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Flowering early May-early Jul. +
Bull. Torrey Bot. Club +
overlapping +
distinct +
Illustrated +  and Endemic +
branched +, sympodial +, monopodial +  and branching +
non-papillate +
cylindrical +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
persistent +  and deciduous +
ferruginous +  and white +
Salix maccalliana +
Salix sect. Maccallianae +
species +
rounded +
sympodial +, branching +  and heterophyllous +