46 Flora 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 sterns^ often rooting at the 

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

 along the ditches, etc. 



374. Polygonum Hydro paper 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. 



SANTALACE^E. (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. 



EUPHORBIACE^E. (Spurge Family.) 



377. Euphorbia petaloidea ENGELM. Prostrate, leaves en- 

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

 mer and fall. 



378. Euphorbia glyptosperma ENGELM. 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. 



