46 Mora of Denver. 



bristles; flowers in a close spike, rose color. Valverde, in a 

 swampy place where the vegetation was all tall. 



371. Polygonum amphfbium L. Aquatic, with floating 

 leaves and spikes of rose-colored flowers. In a pond between 

 Denver and Morrison. Summer. 



372. Polygonum Muhlenbergii WATSON. In muddy places 

 with creeping stems. Similar to the preceding. Along the 

 Platte. Summer. 



373. Polygonum Hartwrightii GRAY. (SMART-WEED.) 

 Branched from the base, slender stems often rooting at the 

 joints. Spikes of rose-colored flowers, numerous. Common 

 along the ditches, etc. 



374. Polygonum Hydropiper L. Small, few-flowered spikes 

 terminating the slender stems, flowers white. Along the 

 Platte. Common in marshy spots. Fall. 



375. Polygonum dumetorum L. var. scandens GRAY. Sim- 

 ilar in appearance to the morning-glory vine. Common. 



SANTALACEiE. (Sandal-wood Family.) 



376. Comandra pallida DC. Stems many from a woody root, 

 glaucous, terminated by umbels of creamy flowers, petals rather 

 thick and sometimes tinged with pink. Common on the plains 

 .and along the Platte. Spring. 



EUPHORBIACEiE. (Spurge Family.) 



377. Euphorbia petaloidea EXGELM. Prostrate, leaves en- 

 tire with fringe-like stipules. Common. Seeds reddish. Sum- 

 mer and fall. 



378. Euphorbia glyptosperma EXGELM. Near Denver, Dr. 

 Smith. 



379. Euphorbia maculata L. Prostrate, leaves serrate, 

 seeds 4-angled and each side grooved, the whole plant becom- 

 ing red. Common. Summer and fall. 



