PLANTS FROM SOUTHEASTERN UTAH. 325 



Butler Wash. The cups are 12 mm. in diameter, acorns 

 exserted 15 mm. 



These two forms are certainly quite different in appear- 

 ance and fruit, but variation among oaks is so great that 

 almost anything may be expected. J^. Gambellii from 

 Mancos, Colo., has the acorns spicate as in Jg_. venustula, 

 but the foliage is that of typical J$>_. Gambellii. 



144. Salix longifolia Muhl., Ges. Naturf. Fr. Neue 

 Schr., iv, 238 (1803). 



Type locality: ("ad Susquehanna") i. e., near the 

 Susquehanna River in Pennsylvania. 



Two forms of this variable species were collected. 

 Those from Willow Creek Canon have leaves nearly 18 

 cm. long, 8 mm. wide, almost glabrous; those from 

 the head of Willow Creek have leaves not more than 7 

 cm. long, 4 mm. wide, silky-canescent. 



145. Salix lasiandra Benth. var. Fendleriana Bebb. 

 This was common along the San Juan River. Only 



barren shoots collected. 



146. Salix cordata Muhl., in Ges. Naturf. Fr. Neue 

 Schr. iv (1803), 236. 



Collected near the head of Willow Creek with young 

 shoots showing the stipules. 



147. Populus Fremontii var. Wislizenii Wats., Am. 

 Journ. Sci., Ser. 3, xv, 136 (1878). 



Range of variety : "From southern California to the 

 Rio Grande." 



This was the only cottonwodd noticed along the San 

 Juan River below McElmo Creek. It is within the range 

 of the type and farther north than reported before. 



148. Juniperus occidentals Hook. var. monosperma 

 Engelmann, Trans. St. Louis Acad., iii, 590. 



Type locality: " Canon City, Colo." 



