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

47. Salix raupii Argus, Canad. J. Bot. 52: 1303, plate 1. 1974.

Raup willow

Plants 1.2-1.8 m, not clonal. Stems erect; branches gray-brown, glabrous; branchlets yellow-brown, glabrous. Leaves: stipules foliaceous; petiole 5-9 mm; largest medial blade narrowly elliptic, 32-58 × 12-19 mm, 2-3.3 times as long as wide, base cuneate or convex, margins slightly revolute, entire, apex acute to acuminate, abaxial surface glabrous, adaxial slightly glossy, glabrous; proximal blade margins shallowly serrulate; juvenile blade glabrous. Catkins: staminate 17.5-42 × 5-13 mm, flowering branchlet 6-7 mm; pistillate moderately densely flowered, stout, 20-40 × 6-12 mm, flowering branchlet 4-7 mm; floral bract tawny or bicolor, 1.3-2.5 mm, apex rounded, entire, abaxially glabrous. Staminate flowers: abaxial nectary 0.3-0.8 mm, adaxial nectary narrowly oblong, 0.6-1 mm, nectaries distinct; filaments distinct, glabrous; anthers ellipsoid, shortly cylindrical, or globose, 0.4-0.7 mm. Pistillate flowers: abaxial nectary absent, adaxial nectary narrowly oblong or oblong, 0.5-1.1 mm, equal to or longer than stipe; stipe 0.4-1.2 mm; ovary pyriform, usually glabrous, rarely puberulent, beak slightly bulged below styles; ovules 12 per ovary; styles 0.6-0.8 mm; stigmas flat, abaxially not papillate with rounded tip, or broadly cylindrical, 0.3-0.5 mm. Capsules 4.4-8 mm.

Flowering late Jun. Thickets in moist, open forests, gravel floodplains; of conservation concern; 800-1500 m; Alta., B.C., N.W.T., Yukon.

Salix raupii resembles glabrous S. glauca var. villosa . Thin-layer chromatography of leaf phenolics in S. raupii revealed a pattern similar to those of S. glauca vars. villosa and acutifolia and S. athabascensis (G. W. Argus, unpubl.). Based on overall similarity, its nearest neighbors are S. glauca , in a broad sense, and S. athabascensis (Argus 1997). The sectional placement of this species is uncertain. It is placed here in sect . Myrtilloides because it clusters with S. athabascensis , but it is evidently close to S. glauca and may be a species of intersectional hybrid origin.

Updated: 2019-10-24 03:03:34 gmt
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