327] FLORA OF BOULDER, COLORADO I79 



733. A rhizomata A. Nels. Rhizomatous white evening 



PRIMROSE. 



Local on the plains, but abundant where found, since it 

 spreads fast with its slender rootstocks, 5600-5400 ft. (Daniels, 



393)- 

 Wyoming to Colorado. 



734. A. Nuttallii (Sweet) A. Nels. [Oenothera Nuttallii 

 Lindl.]. Nuttall's white evening primrose. 



At Boulder (Rydberg). 

 Minnesota to Idaho and Colorado. 



735. A. coronopifolia (T. & G.) Britton [Oenothera coronopi- 

 folia T. & G.] . Cut-leaved white evening primrose. 



At Boulder (Rydberg). Very common from Boulder and 

 Marshall up to about 8000 ft. in dry soil (Ramaley). 

 South Dakota to Wyoming; Kansas to New Mexico. 



300. PACHYLOPHTJS Spach. Scapose evening prim- 

 rose. 



736. P. montamis (Nutt.) A. Nels. [Oenothera montana 

 Nutt.]. Mountain scapose evening primrose. 



In eroded soil on Green Mountain and along Boulder Canon 

 road, 6000-8000 ft. (Daniels, 536). 



Assiniboia to Idaho ; Colorado to Nevada. 



737. P. macroglottis Rydb. Large-throated scapose even- 

 ing primrose. 



At Boulder (Rydberg). 

 Colorado. 



738. P. hirsutus Rydb. Hairy scapose evening primrose. 

 Mountains between Sunshine and Ward (Rydberg). 

 Wyoming to New Mexico and Utah. 



301. LAVAUXIA Spach. Delavaux' evening prim- 



rose. 



739. L. brachycarpa (Gray) Britton [Oenothera brachycarpa 

 Gray]. Short-podded Delavaux' evening primrose. 



At Boulder (Rydberg). 



Kansas to Montana ; Texas to New Mexico. 



