IOWA ACADEMY OF SCIENCES. 147 



V. SALIX BEBBIANA SARG. 



Salix bebbiana Sargent. Gard. & For. 8:468. 1895. 



Salix rostrata Rich. Frank. Journ. App. 753, 1823. Not 

 Thuill, 1799. 



This tall tree-like shrub or small tree is not at all common 

 in our state. Its southwestern extra-Iowa range extends to 

 Nebraska and Utah and hence we may hope to find it more 

 widely distributed in Iowa than the present collections indicate. 

 It is found in wet or moist places or on higher and dry ground. 



The twigs are orange-red to brown or purplish and are 

 roughened by large, elevated leaf -scars. Not enough speci- 

 mens were examined to determine the variations of the leaves. 

 They show a peculiar blue-green tinge when young. The 

 pistillate aments when mature are two inches long and an inch 

 wide, becoming quite loose from the lengthening of the pedi- 

 cels. The mature capsule is four to five lines long and the 

 pedicel one-half that length. The ovate or more commonly 

 oblong scales do not always show the rose color at the tips. 



Hackberry Grove, Oerro Gordo Co. 12, Shimek, S. U. I.; Charles Olty, Floyd Co. 14, 

 Arthur (2 spec); Fayette, Fayette Oo. 18, Fink (2 spec.) Herb.; Marshalltown. 30, Pammel 

 {No. 1192) ; Steamboat Rock, Pammel & Hume {No. 1949). 



VI. SALIX DISCOLOR MUHL. 



Salix discolor Muh.]. Neue Schrift. Ges. Nat. Fr. Berlin. 4: 

 234. pi. 6. f. 1. 1803. 



The glaucous willow, or pussy willow, as this has been called, 

 is very common in swampy places or along river banks in the 

 eastern and central portions of our state. Little collecting 

 having been done in the southwestern part, it is not known 

 whether it is as common there or not, but as that region is about 

 the limit of its western range it would not be surprising if 

 found to be much less common there. Like most of the other 

 common species it presents considerable variation in both leaves 

 and aments. Some of these varieties have been considered by 

 different botanists to be worthy of specific rank. The extremes 

 of these variations are fairly distinct but all gradations are 

 shown by the intermediate forms. A specimen with loose aments 

 or one with dense aments is occasionally accompanied by leaves 

 retaining a ferruginous pubescence when mature, and either 

 one may show long styles and laciniate stigmas. 



