152 IOWA ACADEMY OF SCIENCES 



On fully half of the mature capsules examined a very few 

 minute scattered hairs were found. The bracts are very small, 

 red or reddish, densely long-villous. The flowering period 

 extends from April 10th to May 15th or longer. 



Little Rock, Lyon Oo. 3. Ball Bros.; Armstrong, Emmet Co. 5. Cratty Herb. (Nos. 

 2, 4, t02) ; Forest Olty (near), Hancock Oo. 8. Shimek, S. U. I.; Charles City, Floyd Co. 14. 

 Arthur; Calhoun Oo. 19a, Rigg.S. U. I.; Hamilton Co. 21. iJoJ/s; Gilbert, Story Co. 27. 

 Pammel and Beyer {No. 1210); Columbus Junction, Pammel, {1033d); Ames, Story Co. 28. 

 Benton, Bessey, Burgess, Reynolds, Hitchcock (3 spec), Williams, Pammel (Nos. 1203, 1205), 

 Pam.mel and Ball (No. 1211), Ball {No. 1209) ; Marshalltown. 30. Pammel {No. 1206); John- 

 son Co. 30. Shimek {2 spec.) S. U. I. ; Solon, Johnson Co. 37. Shimeh, S. U. I. ; Blue Grass, 

 Scott Co. 40. Barnes and Miller {Nos. 4, 6); Steamboat Rock, Pammel and Hume {1932 C, 

 1036 G, 1943 N, 1944 M); Muscatine. 41. Reppert, Herb. (4 spec); Carson, Pottawattamie Co. 

 42. Qameron, S. U. I.; Council Bluffs, 42a. Hayden, 1853-i {Engehn. Herb. Mo.Bot. Gard.). 



CORDATA HYBRIDS. 



So imperfect and incomplete was much of the material that 

 little could be done toward accurate recognition of possible 

 hybrids. The following are placed in this list, chiefly on account 

 of the thinly pubescent capsules. It was noted under the discus- 

 sion of cordata, however, that a few short hairs seem to be nor- 

 mally present. The pubescent capsules indicate hybrids with 

 either S. sericea or S. petiolaris. One of the Fayette specimens 

 is labeled " S. sericea cordata, fide Bebb, " and the other ^' S. cor- 

 data sericea {S. myricoides), fide Bebb". In both the cordata 

 characters are strongly predominant. The leaves of all these 

 supposed hybrids were too young to afford good diagnostic 

 characters. All were more or less silky, but that is normal in 

 typical cordata. They are narrowed at the base in all except 

 the first Fayette specimen mentioned above, in which they show 

 the rounded base, though they are less than one inch long. 



Fayette, Fayette Co. 18. Fink {2 spec) Herb.; Eldrld^e, Scott Oo. 38. Barnes and Mil- 

 ler (Nos. 7,16); Blue Grass, Sjott Co. 40. Barnes and Miller {No. 4). 



XIII. SALIX MISSOURIENSIS BEBB. 



Salix Missouriejisis Bebb. Gard. and For 8: 375. 1895. 



Salix cordata var. vestita Anders. Monog. Sal. Konig. Sven. 

 Vet. Akad. Handl. 6: 156. 1867. 



This willow was first accorded specific rank by Mr. Bebb, in 

 1895. It has been found in Missouri, Kansas and Nebraska, 

 and its presence in Iowa occasions no surprise. It is distin- 

 guished from S. cordata by its larger size, densely puberulent 

 twigs, larger leaves, and longer, fertile aments, and other more 

 minute differences. My determinations of Iowa specimens of 

 this species were made from foliage material only, but this was 

 compared with a large series in the herbarium of the Missouri 

 Botanical garden. 



