Salix alaxensis var. longistylis

(Rydberg) C. K. Schneider

J. Arnold Arbor. 1: 225. 1920.

Endemic
Basionyms: Salix longistylis Rydberg Bull. New York Bot. Gard. 2: 163. 1901
Synonyms: Salix alaxensis subsp. longistylis (Rydberg) Hultén
Treatment appears in FNA Volume 7. Treatment on page 147. Mentioned on page 146, 160.

Shrubs or trees, 1–4 m. Stems: branches yellowbrown or redbrown, glabrous or sparsely villous; branchlets strongly glaucous, glabrescent or sparsely villous. Largest medial leaves: midrib prominent, sparsely pubescent to glabrescent, abaxial surface noticeably glaucous or not. Catkins: pistillate 37–103 × 8–20 mm, flowering branchlet 0–13 mm.


Phenology: Flowering late Mar-early Jul.
Habitat: Pioneer thickets on river alluvium and glacial moraines, subalpine thickets, alpine tundra, moist to mesic talus slopes, forest openings
Elevation: 0-2000 m

Distribution

V7 165-distribution-map.gif

B.C., Man., N.W.T., Yukon, Alaska.

Discussion

Variety longistylis differs from var. alaxensis mainly in its glaucous and less densely hairy branchlets. Some specimens of var. alaxensis, in which the indumentum has been partially removed by wind erosion, show that they, too, have glaucous branchlets. The only fundamental difference between the two may be density of branchlet indumentum. Other differences, which appear in varietal descriptions, may represent inadequate sampling. These taxa sometimes intergrade and var. longistylis may not be worthy of taxonomic recognition. It is included here only because of very conspicuous differences between the extremes.

Hybrids:

Variety longistylis forms natural hybrids with Salix sitchensis.

Variety longistylis × Salix sitchensis grows with both parents at the mouth of the Twentyfour Mile River, south-central Alaska. The plants resemble var. longistylis in having relatively long styles and stigmas, oblong nectaries, and sparsely hairy branchlets, and S. sitchensis in having brittle branches, weakly glaucous branchlets, hairs sparse and crinkled, and ovaries with straight hairs. Fruits were set but no seed developed.

Selected References

None.

Lower Taxa

None.

"-2.5mm" is not declared as a valid unit of measurement for this property."-1.28mm" is not declared as a valid unit of measurement for this property.

21 +, 4 +, 1 +, 16 +  and 29 +
114 +, 95 +, 76 +, 57 +  and 38 +
not +  and glaucous +
oblong +  and narrowly oblong +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
moderately densely villous;glabrescent +
purple turning yellow +
long-cylindrical +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
Acute (?) +  and Convex (?) +
George W. Argus +
(Rydberg) C. K. Schneider +
convex +  and cuneate +
Salix longistylis +
tapering +
yellowish green +  and reddish +
ferruginous +  and white +
woolly-tomentose +
toothed +  and 2-fid +
persistent +
redbrown +  and yellowbrown +
villous +  and glabrous +
flowered +  and pistillate +
villous +, glabrescent +  and glaucous +
slender +  and stout +
0 cm0 mm <br />0 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
intermediate +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
3.7 cm37 mm <br />0.037 m <br /> (10.3 cm103 mm <br />0.103 m <br />) +
pendulous +, spreading +  and erect +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
B.C. +, Man. +, N.W.T. +, Yukon +  and Alaska. +
0-2000 m +
black +  and brown +
pistillate +  and staminate +
bisexual +  and unisexual +
Pioneer thickets on river alluvium and glacial moraines, subalpine thickets, alpine tundra, moist to mesic talus slopes, forest openings +
straight +
unbranched +  and spicate +
subterminal +  and axillary +
membranaceous +
hemiamphistomatous +, amphistomatous +  and hypostomatous +
5 cm50 mm <br />0.05 m <br /> (11 cm110 mm <br />0.11 m <br />) +
obovate +, oblanceolate +, elliptic to elliptic +  and oblong +
1.3 cm13 mm <br />0.013 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
arranged +  and alternate +
marcescent +
deciduous +
crenate +, entire +  and revolute +
sparsely pubescent +  and glabrescent +
2-7[-10]-carpellate +
pyriform +
glandular-dotted +
convex;flat +
0.3 cm3 mm <br />0.003 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Flowering late Mar-early Jul. +
J. Arnold Arbor. +
overlapping +
distinct +
decumbent;erect +
non-papillate +
cylindrical +
0 cm0 mm <br />0 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
caducous +  and persistent +
distinct +  and connate +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.28 cm2.8 mm <br />0.0028 m <br />) +
persistent +  and deciduous +
Salix alaxensis subsp. longistylis +
Salix alaxensis var. longistylis +
Salix alaxensis +
variety +
pointed +  and rounded +
sympodial +, branching +  and heterophyllous +
tree +  and shrub +