298 THE AMERICAN MIDLAND NATURALIST 
No trees surpass or equal this in the tendency of forming 
natural groves whenever it has the slightest opportunity. No other 
tree seeds itself on the open prairie. 
Leeds, Butte, Dunsieth; Kulm (Brenckle). 
AIGEIROS Homeros, Odyss. VII: 106, XVII: 208. Hesiodus, 
Sct. Hert’ 3772 Theophr:' lls 14keioses It teas 
303. Aigeiros deltoides (Batr.) Tidestrom, Elysium Maria- 
nom TL p16. (1r9r0). 
Populus deltoides Batr.: Marsh, Arb. Am. p. 106. (1785). 
Everywhere in cultivation, and, when indigenous, growing 
in such protected places as railroad ditches, ravines, etc. Leeds. 
304. Aigeiros Sargentii. : 
Populus Sargentit. 
A tree “easily recognized by the pubescent winter-buds 
and by the light yellow color of the branchlets.’’ It ought to grow 
“especially in the western part of the state.’’ (The citations are 
from a letter by Prof. C. S. Sargent.) 
305. Aigeiros balsamifera (Linn.) Lunell. 
Populus balsamtfera Linn. Sp. Pl. 1034. (1753). 
An indigenous tree. Turtle Mountains. 
306. Aigeiros candicans (Ait.) Nwd. in Am. Midl. Nat. 
Vobeliispy 223 (19912): 
Populus candicans Ait. Hort. Kew. 3. p. 406. (1789). 
Escaped from cultivation. Leeds. 
SALIX: Virgilius Ecl: Il; 83, -V> 16, X: 140, Georg. IVa 
Culex 54. Plinius: Nat. Hist. XX: 20: 
307. Salix vitellina Plinius XVI: 37. Linn. Sp. Pl. ed. 2, 
1442. (1763). 
Cultivated like the following and often escaping. Leeds. 
308. Salix vitellina aurea. 
A variety widely used for hedges. Leeds. 
309. Salix amygdaloides Anders Ofv. Sv. Vet. Akad. 
Forhandl. 15:114. (1858.) 
Leeds, Minnewaukan. 
310., Salix lucida Muhl. Neue Schrift. Ges. Nat. Fr. Berlin 
42230, 7 6;.1--7; (1803). 
In the Willow Creek ravine near Dunsieth. 
311. Salix interior Rowlee, Bull. Torr. Bot. Club, 27, p. 253. 
(1900). . 
Salix longifolia Muhl. 1. c. 238. (1803), not Lam. (1778). 
