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18. Salix exigua Nuttall, N. Amer. Sylv. 1: 75. 1842.
Salix fluviatilis Nuttall var. exigua (Nuttall) Sargent; S. longifolia Muhlenberg var. exigua (Nuttall) Bebb
Shrubs or trees, 0.5-5(-17) m. Stems: branches gray-brown, red-brown, or yellow-brown, villous, or tomentose to glabrescent; branchlets yellowish, yellow-brown, or red-brown, pubescent or puberulent, tomentose, short- or long-silky villous. Leaves: stipules absent or rudimentary on early ones, foliaceous or rudimentary on late ones; petiole 1-5(-10) mm, pubescent or puberulent, villous, or short-silky adaxially; largest medial blade (sometimes hypostomatous), linear or lorate, (glands marginal), 30-136-143 × 2-14 mm, 6.5-28(-37.5) times as long as wide, base cuneate, margins slightly revolute, entire or remotely spinulose-serrulate, apex acuminate or acute, abaxial surface glaucous (sometimes obscured by hairs), densely long-silky, villous or pilose to glabrescent, hairs appressed or spreading, straight or wavy, adaxial slightly glossy, sparsely or densely long-silky to glabrescent; proximal blade margins entire; juvenile blade yellowish green, densely long-silky-villous abaxially. Catkins: staminate 7-54 × 2-10 mm, flowering branchlet 1.5-56 mm; pistillate loosely to densely flowered, slender or stout, 14.5-70 × 3-12 mm, flowering branchlet 2-55 mm; floral bract 1.2-2.6 mm, apex acute, convex, or rounded, entire or erose, hairs wavy, straight, or crinkled, abaxially hairy throughout or proximally, or glabrate. Staminate flowers: abaxial and adaxial nectaries present and distinct; filaments hairy on proximal 1/2; anthers (sometimes reddish turning yellow). Pistillate flowers: adaxial nectary oblong, ovate, or flask-shaped, relative adaxial nectary/stipe length variable even within same catkin; stipe 0-0.9 mm; ovary obclavate or pyriform, glabrous, pilose, or villous, or sometimes beak hairy, beak bulged below or abruptly tapering to styles; ovules 12-30 per ovary; styles (sometimes distinct), 0-0.5 mm; stigmas flat, abaxially non-papillate with rounded tip, or 2 plump lobes, 0.1-0.5 mm. Capsules 4-8 mm. 2n = 38.
Varieties 2 (2 in the flora): w North America.
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Branchlets densely short-silky-tomentose or short-silky-villous; juvenile blades densely long-silky abaxially, hairs usually appressed, sometimes a few spreading; stipes 0.2-0.9 mm; styles connate, 0-0.2 mm; ovaries usually glabrous, sometimes beak hairy; stigmas flat, abaxially non-papillate with rounded tip, or 2 plump lobes. |
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18a Salix exigua var. exigua |
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Branchlets pubescent or densely long-silky-villous; juvenile blades densely long-silky-villous abaxially, hairs spreading, appressed; stipes 0-0.2 mm; styles connate or ± distinct, 0.1-0.5 mm; ovaries pilose or villous to glabrescent; stigmas flat, abaxially non-papillate with pointed tip, or slenderly cylindrical. |
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18b Salix exigua var. hindsiana |
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Lower Taxa
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