1919] SCHNEIDER— AMERICAN WILLOWS 7,7,^ 



In BoT. Gaz. 65:25. 1918 I have made 5. stenophylla Rydbg. a 

 variety of 5. exigua, referring to it the eastern and southeastern 

 forms of this species. Rydberg's female type and male syntype 

 came from southern Colorado, Huerfano County, Cuchara River, 

 below La Veta {Rydberg and Vreeland, nos. 6393 f., 6392 m.; N.), 

 and the ovaries are only partly glabrous, while most of the forms I 

 take for var. stenophylla have wholly glabrous ovaries and fruits. 

 The main character by which they differ from typical 5. exigua 

 is the longer pedicel, which in the fruit usually surpasses the gland 

 in length. After all, even this character can scarcely be regarded 

 as constant, and var. stenophylla is connected with the typical form 

 by numerous intermediates. As a whole, however, the forms of 

 5. exigua from Wyoming, Colorado, Arizona, New Mexico, Texas 

 (Randall and El Paso counties), and probably also on the western 

 border of Kansas, in northwestern Oklahoma, and in northern 

 Mexico (northern Chihuahua), seem to present slight variations 

 and may be called var. stenophylla until further studies in the field 

 have led to a more proper understanding of the variability of this 

 species. I suggested in Box. Gaz. 65:25. 1918 that S. Hindsiana 

 var. tenuijolia And. (in K. Sv. Vet.-Akad. Handl. 6:56. 1867) 

 might be identical with var. stenophylla, in which case the name 

 tenuifolia would have to be used. As type a specimen collected 

 by Burke on the banks of the Snake River near Fort Hall in 

 Idaho has to be taken. Judging by a photograph and fragments 

 of the type preserved in Herb. K. I cannot decide whether the male 

 specimen really belongs to what I call var. stenophylla or to the 

 t}^ical S. exigua. It comes from a region where both forms meet. 

 The second specimen cited by Andersson "Nova Mexico (Schur) " 

 is unknown to me, and may probably be referable to var. steno- 

 phylla, which name I prefer to keep so long as the identity of the 

 Snake River form remains uncertain. To var. stenophylla also 

 partly belongs as a synonym S. longifolia * * * opaca And. (in 

 K. Sv. Vet.-Akad. Handl. 6:55. 1867) in so far as it refers to 

 Wright's no. 1873, while Berlandier's no. 2341 represents S. longi- 

 folia angustissima. 



In western Nebraska and northeastern Colorado another form 

 of 5. exigua has been found which somewhat reminds one of the f. 



