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FNA | Family List | FNA Vol. 7 | Salicaceae | Salix

38. Salix ovalifolia Trautvetter, Nouv. Mém. Soc. Imp. Naturalistes Moscou. 2: 306, plate 13. 1832.

Arctic seashore or oval-leaf willow

Plants 0.02-0.05 m, not clonal or forming clones by layering. Stems trailing; branches yellow-brown, gray-brown, or red-brown, glabrous or hairy; branchlets yellow-green, yellow-brown, or red-brown, glabrous or pilose. Leaves: stipules usually absent or rudimentary, rarely foliaceous; petiole (deeply to shallowly grooved adaxially), 1.1-16 mm, (glabrous); largest medial blade hypostomatous, narrowly to broadly elliptic, circular, subcircular, or obovate, 13-46 × 7-20 mm, 1-3.4 times as long as wide, base subcordate, cordate, rounded, or convex, margins slightly revolute or flat, entire, sometimes ciliate, apex convex, rounded, acuminate, acute, or retuse, abaxial surface glabrous, villous, long-silky, pubescent, or pilose, hairs wavy or straight, adaxial highly glossy, usually glabrous; proximal blade margins entire; juvenile blade (reddish or yellowish green), pilose, villous, or long-silky abaxially. Catkins: staminate 4.8-46 × 5-11 mm, flowering branchlet 1.5-24 mm; pistillate moderately densely flowered, stout, subglobose, globose, or slender, 6.3-50 × 5-28 mm, flowering branchlet 2.5-22 mm; floral bract brown, greenish, or bicolor, 1.2-2 mm, apex rounded, entire or, sometimes, 2-fid, abaxially hairy, hairs straight or wavy. Staminate flowers: abaxial nectary 0.6-1 mm, adaxial nectary oblong or ovate, 0.6-1.6 mm, nectaries distinct or connate and cup-shaped; filaments distinct or connate less than 1/2 their lengths (glabrous); anthers elliptic, short-cylindrical, or globose, 0.3-0.5(-0.6) mm. Pistillate flowers: abaxial nectary (0-)0.4-0.6 mm, adaxial nectary longer than stipe; stipe 0.2-1.4 mm; ovary obclavate or pyriform, glaucous or not, usually glabrous or tomentose, sometimes pubescent or villous, beak abruptly tapering to styles; ovules 10-15 per ovary; styles 0.2-0.8 mm; stigmas flat, abaxially non-papillate with pointed tip, or slenderly cylindrical, 0.32-0.41-0.64 mm. Capsules 5.2-9.6 mm. 2n = 38.

Varieties 4 (4 in the flora): n, nw North America, Asia.

1 Ovaries usually tomentose, sometimes glabrous; largest medial blades 8.5-14 mm; endemic to Point Barrow, Alaska.   38d Salix ovalifolia var. glacialis
+ Ovaries usually glabrous, sometimes pubescent or villous; largest medial blades 13-46 mm; not endemic to Point Barrow, Alaska   (2)
2 (1) Largest medial blades subcircular to circular, 1-1.5 times as long as wide.   38b Salix ovalifolia var. cyclophylla
+ Largest medial blades narrowly to broadly elliptic, obovate, or subcircular, 1.1-3.4 times as long as wide   (3)
3 (2) Largest medial blades elliptic, broadly elliptic, or subcircular, 13-28 mm.   38a Salix ovalifolia var. ovalifolia
+ Largest medial blades narrowly to broadly elliptic or obovate, 25-46 mm.   38c Salix ovalifolia var. arctolitoralis

Lower Taxa


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