Salix interior
Salix pseudomonticola
sandbar willow
false mountain willow, serviceberry willow
stipules absent or rudimentary on early ones, rudimentary or foliaceous on late ones;
petiole 1–5(–9) mm, glabrous or sparsely villous adaxially;
largest medial blade linear to lorate, 60–160 × 4–11 mm, (6.5–)11–19(–31) times as long as wide, base cuneate, margins flat, remotely spinulose-serrulate (teeth 2–5 per cm), apex acute or subacuminate, abaxial surface thinly glaucous, densely villous or long-silky to glabrescent, adaxial slightly glossy, pilose or densely villous to glabrescent;
proximal blade margins entire;
juvenile blade reddish or yellowish green, moderately densely to sparsely long-silky abaxially.
stipules foliaceous, (prominent, 5–9–15 mm), apex rounded to acute, sometimes acuminate;
petiole (usually reddish), shallowly grooved, or convex to flat adaxially, 6–20 mm, short-silky or velvety adaxially;
largest medial blade broadly to narrowly elliptic, or ovate to broadly obovate, (25–)30–86(–118) × 12–51 mm, 1.4–3 times as long as wide, base convex, rounded, cuneate, subcordate, cordate, or sometimes irregularly lobed, margins flat, serrulate or crenate, apex acute, acuminate, or convex, abaxial surface glaucous, glabrous, pubescent, or pilose, hairs wavy, adaxial slightly glossy or dull, glabrous, puberulent, pubescent, or pilose, midrib hairy;
proximal blade margins entire or serrulate;
juvenile blade reddish, glabrous or pubescent abaxially, hairs white, sometimes also ferruginous.
abaxial nectary 0.5–1.1 mm, adaxial nectary ovate, narrowly oblong, or flask-shaped, 0.6–1.4 mm, nectaries distinct;
filaments hairy;
anthers 0.4–0.9 mm.
adaxial nectary oblong, 0.3–1 mm;
filaments distinct or connate less than 1/2 their lengths, glabrous;
anthers purple turning yellow, 0.4–0.5 mm.
adaxial nectary narrowly oblong, 0.4–1.1 mm, shorter to longer than stipe;
stipe 0.4–0.8 mm;
ovary obclavate to pyriform, glabrous, glabrescent, or long-silky, beak abruptly tapering to styles;
ovules 16–36 per ovary;
styles 0–0.2 mm;
stigmas flat, abaxially non-papillate with pointed tip, or broadly cylindrical, 0.3–0.7 mm.
adaxial nectary oblong, flask-shaped, 0.3–0.8 mm, shorter than stipe;
stipe 0.5–0.8–3 mm;
ovary pyriform or obclavate, glabrous, beak gradually tapering to styles;
ovules 18 per ovary;
styles (0.5–)0.7–1.8 mm;
stigmas flat, abaxially non-papillate with rounded tip, or 2 plump lobes, 0.1–0.21–0.29 mm.
(4–)5–8(–10) mm.
4–7 mm.
(flowering throughout season); staminate 20–61 × 4–10 mm, flowering branchlet 3–20 mm; pistillate loosely flowered, slender or stout, 20–67 × 5–9 mm, flowering branchlet 3–19 mm;
floral bract (sometimes greenish), 1.5–3.5 mm, apex acute, acuminate, or rounded, entire, erose, or toothed, abaxially hairy either proximally or distally, hairs wavy.
flowering before leaves emerge; staminate stout, 16–39 × 10–12 mm, flowering branchlet 0 mm; pistillate densely or moderately densely flowered, slender to globose, 17–73 × 8–20 mm, flowering branchlet 0–5 mm;
floral bract brown or black, 1–2.4 mm, apex rounded or acute, abaxially hairy, hairs straight.
= 38.
= 38.
Salix interior
Salix pseudomonticola
Sometimes Salix interior is treated as a subspecies of S. exigua (R. D. Dorn 1998). Salix exigua and S. interior hybridize and apparently intergrade in the western Great Plains; because the area of overlap is relatively small and distinctiveness of the two taxa is not compromised by hybridization and introgression, it is best to treat them as separate species.
Leaves on sylleptic shoots are usually very densely silky. Salix interior sometimes has shoots that arise from buds on either side of the normal axillary bud. They do not seem to be directly related to the stipules because they are enclosed by the petiole. Catkins with both staminate and pistillate flowers are rare in S. interior, but a Quebec specimen had some catkins predominantly pistillate and others staminate; most were a mixture. The flowers were not teratological, but a mature capsule contained aborted ovules.
Hybrids:
Salix interior forms natural hybrids with S. exigua var. exigua. Controlled pollinations using S. interior (as S. exigua) from southern Ontario (A. Mosseler 1990) successfully produced F1 hybrids with S. bebbiana, S. discolor, S. eriocephala, and S. petiolaris. Seed production was usually relatively low, except in crosses with S. discolor. In general, F1 viability was relatively low in crosses with these members of subg. Vetrix. No seeds were produced in crosses with members of subgenera Protitea or Salix. Morphology of the hybrids usually was intermediate between the two parents, but when S. petiolaris was used as the maternal parent, the F1s more closely resembled that species. J. Salick and E. Pfeffer (1999) extended these findings to show that, although crosses between S. interior (as S. exigua) and S. eriocephala are partially sterile, their clonal growth parameters (sprouting, shoot length, and biomass production) are strong and thus permit these partially sterile hybrids to exist as successful individuals and perhaps to “... make a contribution to interspecific gene flow over time.” Of particular taxonomic interest is that, in this cross, the staminate parent has a significant influence on leaf shape, whereas in the cross S. eriocephala × S. petiolaris it is the pistillate parent that is significant for leaf shape. Relatively few hybrids resembling those produced by Mosseler have been recognized in nature, but it is possible that the unusually broadly leaved plants named S. interior var. exterior and var. wheeleri, from northern Maine, Nebraska, New York, and West Virginia, and probably elsewhere, may be hybrids. Phenological isolation may be strong enough to prevent crosses in nature (A. Mosseler and C. S. Papadopol 1989) with the earlier flowering S. eriocephala and S. petiolaris, a barrier that even an occasional period of overlap cannot breach.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Salix pseudomonticola is characterized by precocious flowering; catkins sessile; juvenile leaf blades, petioles, and proximal midribs reddish; stipules prominent; and leaves and branchlets sparsely hairy. Branches older than two years have a distinctive pattern, which consists of a series of longitudinal splits in epidermis produced as the branch expands. The edge of epidermis around the split, where it has separated from the branch, is yellow and contrasts with the red-brown branch to which the epidermis still adheres.
Vegetative specimens of Salix pseudomonticola with yellow-brown branches can be confused with S. famelica. They may be separated by their juvenile leaf margins prominently and closely gland-dotted; stipules usually prominent, sometimes early deciduous; leaves broader (1.4–3 times as long as wide versus 2.6–7 in S. famelica); and petioles slender and often longer in relation to blade length. The possibility of hybridization needs study.
Vegetative specimens of Salix pseudomonticola can be distinguished from S. pyrifolia by juvenile leaves reddish and almost always with some ferruginous hairs, versus yellowish-green and glabrous or with white hairs, and mature leaves usually dull adaxially versus glossy.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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