144 IOWA ACADEMY OF SCIENCES. 



A specimen of this species bearing hermaphrodite flowers 

 was collected by Professor Shimek at Cedar Rapids, Iowa, 

 May 9, 1896. He has written a short account of similar flowers 

 in S. amygdaloides. 



Armstrong, Emmet Co. 5, Cratty, Herb (JYo. 101); Charles City, Floyd Co. 14, Arthur, 

 Engelm. Herb. Mo. Bot. Garden); Humboldt Co. 16, Macbride, S. V. 7.; Fort Dodge, 

 Webster Co. 20, Stewart; Ames, Story Co. 28, Hitchcock, Benton, Yeoman, Pammel and Ball 

 (Nos. 1180. 1181), Combs (No. 1182), Ball {No. 1198) ; Cambridge, Story C i. 39, Sample; Cedar 

 Rapids, Linn Co. 32, Shimek, S. U. I.; Iowa City and Johnson Co. 36. Miss Berry, SJiimek, 

 {2 spec.) S. U. I.; Davenport, 39, Shimek, S. U. I.; Blue Grass, Scott Co. 40, Barnes & Miller 

 (Nos 18, 19); Muscatine 41, Reppert (2 spec, one No GIX)) ; Pottawattamie Co. 42, Cameron, S. 

 U. 1.; Muscatine Island, Louisa Co. 43, Meyers (2 spec.) S. V. I.; Mt. Pleasant, Henry Co. 

 44, Mills (4 spec Herb.); Keokuk, 46, Rolfs, Steamboat Rock, Pammel aad Hume (1039, H. 

 194o O). Nos. 1934 and 1940 are intermediate between this and S. amygdaloides. 



II. SALIX AMYGDALOIDES ANDERS. 



Salix amygdaloides Anders. Of v. Vet. Akad. Forh. 15:114. 

 1858. 



This willow, which has nearly the same range and habits, 

 was once considered a variety of the preceding species, and is 

 of ten mistaken for it. The mature leaves will easily differen- 

 tiate the two species but when just in flower they will often 

 puzzle the experts. On some individuals of this species the 

 young leaves will show the glaucous under surface, broadly 

 lanceolate form, long slender petioles, and long acuminate tips 

 as soon as they unfold. Others do not show these distinctive 

 characters until nearly one-third grown, and one can see both 

 forms on the same young twig. One can also see both very 

 large and very small mature leaves on the same tree in the fall, 

 this difference of size seeming to depend on vigor of growth. 



Little or no distinction can be made between the staminate 

 aments of this species and those of S. nigra, though on an 

 average those of the latter are more slender. The pistillate 

 aments are usually longer in fruit, as are also the capsules and 

 their pedicels. The capsules are from one and one-half to two 

 lines long, and the pedicels from one-half to one and one-half 

 lines in length. The scales are variable, being lanceolate or 

 broader to oblong, acute or obtuse, green. The time of flower- 

 ing extends from April 25th to May 25th. 



