1921] SCHNEIDER, NOTES OX AMERICAN WILLOWS, XII. 79 



If this is correct the name can not be used for the combination S. alba x 

 lucida which is represented by Bebb, Herb. Sal. no. 41, and Dudley, Sal. 

 Cayug. no. 844. S. alba X S. fragilis X S. lucida. As Bebb, apud 

 Gray, Man. ed. 6. 481 (1890), states, hybrids between S. alba and S. 

 fragilis "are the commonest of introduced willows," and "these forms 

 are rendered almost inextricable by a further cross, by no means rare, 

 with our native S. lucida.'" I do not doubt that such a cross may be met 



with at different localities. 



S. alba x S. lucida. See under S. alba Pameachiana. 



S. alba x S. nigra. In Gray, Man. ed. 6.481 (1890), Bebb says, that a 

 hybrid of S. nigra "with S. alba var. viteHina has been found in Wayne 

 Co., N. Y." by E. L. Hankenson. In Garden & Forest, vm. 423, fig. 58 

 (1895), Bebb describes and figures this form as S. nigra x alba. I have 

 not studied the specimens collected by Hankenson but I have some 

 doubt as to the correctness of the interpretation. This form has been 

 named S. Hankensonii by Dode in Bull. Soc. Bot. France, lv. 655, fig. 

 D on p. 653 (1909). 



S. amygdaloides X S. longipes. This hybrid was first observed by 

 Glatfelter, see his notes on Salix longipes in Rep. Missouri Bot. Gard. IX. 

 49 (1898). 



S. amygdaloides X S. longipes x S. nigra. See Glatfelter, 1. c. 



S. amygdaloides X S. nigra. This hybrid has been well described and 

 figured by Glatfelter in Trans. Acad. Sci. St. Louis, vi. 427, pi. 1 (1894). 

 I have seen plenty of material of it collected by Glatfelter and others, 

 and I wish to propose the name x S. Glatfelteri for it. 



S. anglorum X S. cordifolia. This hybrid does not apparently occur 

 unfrequently in Labrador and in other regions where both parents meet. 

 As I have already explained in Bot. Gaz. lxvi. 345 (1918), Rydberg's 

 S. Waghornei in Bull. N. Y. Bot. Gard. i. 271 (1899), seems to represent 

 such a hybrid so far as it can be judged by the poor type-specimen. I 

 have seen a number of specimens which seem to be of this hybrid origin. 



S. anglorum var. araioclada X S. glauca var. glabrescens. A specimen 

 collected by R. A. Ware on dry talus slope near Burgess Pass, British 

 Columbia, on August 13, 1907 (f.; G.; 18 to 40 cm. high), seems to repre- 

 sent such a cross. It needs, of course, further observation. 



? S. arctophila X S. Uva-ursi. J. A. Allen, on August 20, 1881, col- 

 lected a plant at Dead Islands, Labrador, on dry rocky ground growing 

 with S. Uva-ursi (S. Cutler i), depressed, but a little larger than this 

 species. The specimens bears No. 21, and may be of hybrid origin, the 

 other parent being S. arctophila. 



S. argyrocarpa X S. planifolia. This hybrid was first mentioned by 

 Bebb apud Gray, Man. ed. 6.481 (1890), who stated under S. argyro- 

 carpa that a hybrid with S. phylicifolia (= S. planifolia) had been de- 

 tected by Mr. E. Faxon in Tuckerman's Ravine, White Mountains, N. 

 H., but that leaves had already been collected by Dr. Gray as early as 

 1842. Faxon and Bebb described this hybrid later in 1890 in Bull. Torr. 



