1921] SCHNEIDER, NOTES ON AMERICAN WILLOWS. XI 191 



Rocky Mts. 193 (1917). — S. cordafa a M ackeyizieana Hooker, FI. Bor.- 

 Am. II. 149 (1839), — Bebb apud Macoun, Cat. Can. PI. 497 (1886); 

 in Garden & Forest, viii. 473 (1895). — Jepson, FL Cal. 341(1909).— 

 This Willow was first mentioned by Hooker, 1. c., as follows:" Mack- 

 enzieana: foliis obovato-lanceolatis — S. MacJccnzieana Barratt, mst. 

 Anderson, in 1858, stated under S. cordafa: ''Sub liac specie duas formas 

 attulit Hooker 1. c. 1. S. halsamiferam Barratt, et 2) S. MacJcenzieanam 



99 



Barratt." He added: S. Mackenzicana mihi hybrida proles ex >S. cordata 

 et vagante \ = 5. Behbiana] videtur. " In 1867 and 1868 he also regarded 

 S. mackenzieana as such a hybrid. It is, however, a good species, and 

 has nothing in common with S, Behbiana except the very long pedicels. 

 I have seen material from the North West Territories where Hichardson 

 collected the type in June 1826 on the IVIackenzie River and from Alberta, 

 British Columbia, Idaho (Latah, Custer, Lincoln Counties), Washington 

 (AVhitman, Spokane, Adams and Columbia Counties), Montana (Lewis 

 and Clark, Powell, Gallatin, Flathead and Park Counties), Wyoming 

 (Yellowstone Park), Oregon (Washington, Good River, Wasco, Uma- 

 tilla, Union and Lane Counties) and California (Siskiyou County), Prob- 

 ably the species is much more widely spread but sometimes it is not easy 

 to distinguish young flowering specimens of it from those of S. lutea or 

 S. monochroma. 



Ball ajnid Piper & Beattie, Fl. Northwest Coast, 116 (1915), describes a 

 var. macrogemma with densely pubescent-tomentose branchlets and 

 elongated densely pilose-tomentose buds from Seattle, Portland and 

 Corvallis. This form and the typical S. Mackenzieana have hitherto 

 been confused with the eastern S. cordafa. 



60. S. lutea Nuttall, N. Am. Sylva, i. 63, t. 19, f. dextr. sup. (1843) — 

 Ball apud Coulter & Nelson, New Man Rocky Mts. Bot. 132 (1909). — 

 Rydberg, Fl. Rocky Mts. 193 (1917). — S. cordata 2. S. anyustaia 



vitellina Anderson in Svensk.Vet.-Akad. Handl. VI. 159 (Monog. Salic) 

 (1867), an excl. f. crassa? — S. cordata P angustata 3 vitellina Andersson 

 in De Candolle, Prodr. xvi*^. 252 (1868). — S. cordata var. Watsoni Bebb 

 apud Watson, Bot. Calif, ii. 86 (1879), fide Ball; Jepson, Fl. Calif. 341 

 (1909). — S. cordata var. lutea Bebb in Garden & Forest, viii. 473 (1895). — 

 S. flava Rydberg in Bull. Torr. Bot. Club, xxviii, 273 (1901). — S. 



Ormshyensis Von Seemen, 1. c. xxx. 635 (1903), fide Ball. — S. Watsonii 



Rydberg, 1. c. xxxiii. 137 (1906); Fl. Rocky Mts. 193 (1917). — Nuttall, 

 in his good description, says of this species: "It is . . . remarkable 

 for its smooth light yellow branchlets and pale green, rather small, lucid 

 leaves." Ball, in 1909, states that the pedicels are only up to 2 mm. 

 long but according to my own observations they sometimes attain a 

 length of 3-3.5 mm. Ball adds: "Distinguished only with difiiculty 

 from 5. cordata and may perhaps prove to be only a variety of that species. " 

 I am not well enough acquainted with the typical cordata^ especially its 

 western forms, to say anything about the taxonomic value of S. lutea 



