SALICACEAE (WILLOW FAMILY) " 135 



VII. Lanatae.— T;ikfos% shrubs 1-4 m. high;.ttings stovt, divaricate, tomenr- 

 tose: leaves large, broadly elliptical to obovate-oval or suborbicular, more or 

 less tomeniose; ameriis very large, stovt and dense^ sessile or short-peduncled, 



I 3^8 cm. long, lateral or terminal; cap^ides large, sessile or subsessile, glabrous 

 (in our- species) or tomentose; styles mueh, elongated. Only one species cer- 

 tainly within our limits. 



19. Salix Tweedyi (Bebb) Ball, Bot. Gaz. 40: 377. 1905. Low (?) shrub; 

 the youngest twigs more or less tomentose with long hairs: leaves broadly 

 elliptical to 'oval or ovate; acute or ofetuse at both ends to rounded or cordate 

 at the base, 5-7 cm. long, 2-4 cm. wide, green above, paler but not glaucous 

 beneath, glabrous throughout or sparsely gray-tomentose above, finely 

 glandular-denticulate or mature leaves irregularly spinulose-denticulate ; 

 petioles tomentose, 8-15 mm. long; stipules large, clasping, broadly reniform, 

 glatidulaf-deiiticulate: aments precocious, the pistillate sessile, 4-6 cm. long, 

 1.5 cm. or more wide ; scales obovate, black, clothed with long white hairs : cap- 

 sule large, green, glabrous or finely pubescent at the apex, 7-8 mm. long; 

 pedicels 1 mBj. long; styles 1.5-2.5 mm. long; stigmas divided; gland 1 mm. 

 long. (S. Barrattiana Tiveedyifiehh, Contrib. U. S. Nat. Herb. 3:572. 1896.) 

 — In bogs and along mountain streams, 2,500-3,000 m. altitude, not common; 

 known only from the Big Horn Mountains of northern Wyoming, the Yellow- 

 stone Park,' ahd Teton Basin. -'' 



VIII. Arcticae. — Low, erefit, or, /creej^ing alpine scrubs, i-10 or IB dm. high; 

 branches full of leaf-scars: leaves small to medium, narrowly elliptic or ob- 



. I, lanceolate, ocamsioimlly broader, entire, more or; legstomsviose; stipules small 

 or none: aments appearing viith the leaves, on short, leafy peduncles; scales 

 brown, brown-tipped, villpus: capsules sessile or short-pediceled, gray- or 

 : white-tomeniose;- styles 1-1.6 mm. long; stigmas medium, notched. 



Erect or spreading subalpine shrubs 2-15 dm. high. 



Capsules and leSt'eff gray- or yellowish-tomentose or leaves glabrate. 

 Aments much longer than broad; leaves gray-tonientose, drying 



bl^ck .,.,,. . . . . , . . , . 20. S. glaucops. 

 Amenta subglobbse, 'leaves 'yellowish-tomeniosfe beneath, not 



drying black . . . . ','':'' .• . . . 21. ^. brachycarpa, 

 Capsules and lower leaftsucfaces densely whitertomentose . . 22. S. Candida; 

 0epresaed, creeping alpine. plants, les; t^an 1 dm. high. 



Leaves broacft'y^miptibm to obovate, pale beneath, 2h-4 cm. long . 23, S. petrophila. 

 Leaves nat¥owly ellit>tical or obovate, scarcely 10-12 mm. long . 24. S. tenera. 



20. Salixglaiicops Anders, be.. Prodr. 162; 281. 1868. Subalpiiie shrub, 

 4-1)5, dm. high; branches and twigs short and stout, shining, chestnut-brown 

 or darker, the.bajrk separating from the older branchlets in thin gray papery 

 flakes: leaves elliptic-lanceolate, or oblanceolaite . to oblong-ovate, entire, 

 obtuse or subacute at the apex, obtusish to subcordate at the base, 3-5 or 

 6 em. long, 1-1.7 or 2 cm. wide, gray-tomentose or glabrate on both sides, 

 dark green above, glaucous and reticulate beneath; petioles yellowish, 5-10 

 mm. long; stipules minute, ovate or semicordate: peduncles 2-3 cm. long, 

 tomentose; staminate aments 1-3 cm. long, 1-1.5 cm. wide; pistillate 3-5 cm. 

 "loiig and 1.5 cm. 'wide; scales oblong, dark to pale brown, villous: capsules 

 conic, gray-tomentose, 6-7 or 8 mm. long; pedicels stout, pubescent, 1-1.5 mm. 

 long; styles fuscous or yellowish, 0.7-1 mm. long. {S. pseudolapponum v. 

 Seem. Engl. Jahrb. XXIX, BeibL 6ft; 28^ 1900; S. Seemannii Rydb. Bull. N. Y. 

 BQt.Gairdj2: 164. 1901;/Sr.t™oniinflrensisRydb.Bull.Torr. Bot. Club 28: 271. 

 1901.) — Common in, boggy places at middle to high elevations; New Mexico 

 to Canada and westward. ^ , ; 



, 20.a. Salix glaucops glabrescens Anders. Leaves more i;igid, glabrate, 

 intensely glaucous beneath: aments stouter,, capsules sometimes glabrescent. 

 — Range of the species but, less common.,,,,! 



21. Salix bracnycaxpa Nutt. N. Am. .Sylva 1: (59. 1842. A sma,ll alpine 

 shrub,, scarcely more than 1 m. high; branchje? stoutish and divai-icate 

 .within our limits, longer and more slender northward, reddish-brown to 

 .yellowish, pr gray; twigs tomentose: leaves. elliptical-oblong or oblanceolate 



