190 JOURNAL or THE ARNOLD ARBORETUM (vol. h 



Forms of S. cordata witli twigs pubescent, young leaves thinly silky, and 

 capsules occasionally thinly villose (S. imjricoides Muhl.) should not be 

 confused with it." But in his MS.-list Ball regards S. mijricoidcs as 

 probably S. cordata X acricea, and he mentions only one variety of S. 

 cordata, namely var. angusfata Andersson in De Candolle, Prodr. xvi.^ 

 252 (18G8). (S. angustata Pursh, Fl. Am. Sept. ii. 613 [1814;] S. cordata 

 2 S. angustata Andersson in Svensk. Vet.-Akad. Handl. vi. 158 [l867J, 

 pro parte). Andersson proposed some forms which partly do not belong to 

 S. cordata (see S. lutea p. 191). Salix cordata angustata seems to be a very com- 

 mon variety. A mere forni of it apparently is the so-called f. purpurasccns 

 Hort. (S. Nicholsonii f. purpurasccns Dlcck, Neuheiten-Offerte 1SH9-90, 18 

 [1889].— DlppelJIandb. Laubh. ii. 284 [1892].— S. cordata var. rigida f. pur- 

 purasccns Schneider, 111. Handb. I. 50 [1904]) which has been regarded as a 

 hybrid of S. cordata with S. nigra but it is nothing than typical cordata or 

 a form of it. There is, certainly, no hybrid w4th S. nigra in existence. 



S. cordata is so far as I know not represented in the west. I do not, how- 

 ever, know the exact eastern limits of its geographical range. 



58. S. missouriensis Bebb in Garden & Forest, viii. 373 (1895). 

 Glatfelder in Trans. Acad. Sci. St. Louis, vii. 137 (1896). — Sargent, 

 Silva, IX. 137, t. 480 (189G); xiv. 104 (1902). — Ball in Proc. Iowa Acad. 

 Sci. VII. 152 (1900). — Britton, Man. ed. 2, 314 (1905). — Robinson & 

 Fcrnald, Gray's New Man. ed. 7, 323, f. G51 (1908). — Britton & Shafer, 

 N. Am. Trees 197, fig. 158 (1900). —5. cordata 1. S. rigida d. vcstita 

 Andersson in Svensk. Vet.-Akad. Ilandl. vi. 159 (18G7). — S. cordata 2 

 rigida 7"" vcstita Andersson in De Candolle, Prodr. xvi.'^ 252 (1808). — 

 S. cordata Britton & Brown, 111. Fl, ed. 2, i. 596, f. 14G3 (1913), i)ro parte.— 

 The type of this, as Robinson and Fernald say, "])Oorly imderstood 

 tree" has been collected *'a Duce Neuwied i)ro])e Fort Osage flu v. Miss- 

 ouri." According to Ball (1900) it is distinguished from S. cordata by 

 its larger size, densely j)uberulent twigs, large leaves, and longer, fertile 

 amcnts, and other more minute differences." See also the characters 

 given in the keys. I have not had the opportunity to make a special 

 study of this species which according to Britton (1908) ''is known in the 

 vaHeys of the Missouri and Mississippi rivers and of tributary streams, 

 from Kentucky, Illinois, and Missouri to Iowa and Nebraska. 



59. S. mackenzieana* Barratt apud Andersson in Ofv. Svensk. Vet.- 

 Akad. Furh. XV. 125 (1858); in Proc. Am. Acad. iv. 65 (Sal. Bor.-Ani. 

 10) (1858); in Svensk. Vet.-Akad. Handl. vi. 1(50, t. 8, f. 91* (18G7); 

 in Ue Candolle, Prodr. xvi.= 252 (18GS). — Britton & Shafer, N. Am. 

 Trees, 197, fig. 157 (1908), pro parte. —Ball apnd Coulter & Nelson, New 

 Man. Rocky Mts. Bot. 133 (1909); in Piper & Beattie, Fl. Nortliwest 

 Coast, 115 (1915).— Henry, Fl. Brit. Col. 9 (1915). — Rydberg, Fl. 



* Hooker spells the name Mackenzic.ana, and Anderson does the same in 185H quoting 

 Hooker. Later he writes Mackcvziana, a spelling adopted by all the later autlions. I sup- 

 pose tlie first spelling is the correct one. 



