9 o 



Wyoming Experiment Station. 



ing in our Cottonwoods but mostly erect in the Willows. 

 The female flower cluster develops into a somewhat simi- 

 lar but more elongated cluster of capsule-like fruits, which 

 are two-celled and contain several small seeds that are 

 furnished with a tuft of fine hairs. When mature these 

 are readily borne for miles by the wind, but only a very 

 small percentage are ever lodged in a suitable place for 

 germination and development. 



XX. COTTONWOODS. Twigs showing characteristic winter buds. I. Balm of Gilead. 

 2. Aspen. 3. (Common) Cottonwood. 4. Lanceleaf Cottonwoad. 5. Narroivleaf Cottonwood. 



