Flora of Denver. 17 



LOASA'CE^E. (Mentzelia Family.) 



129. Mentzelia albicaulis DOUGL. Erect with simple or 

 branching white stems, flowers small and yellow, seeds warty. 

 Along the Platte. Spring and summer. 



130. Mentzelia niida T. & G. (EVENING STAR.) Stems 

 erect and branching above. Large yellowish white flowers 

 with filaments numerous and like the petals. Seeds winged. 

 Common. Summer and fall. 



131. Mentzelia multiflora GRAY. Stems branching dif- 

 usely. Flowers numerous, bright yellow. Seeds winged. 

 Along the D. & R. G. track near Valverde Bridge and the 

 South Park track at Valverde. Summer. 



CUCURBIT ACE^E. (Squash Family.) 



132. Echinocystis lobata TORR. & GRAY. (WiLD CUCUM- 

 BER VINE.) Common in cultivation. Wild along the Platte. 

 Summer. 



CACTACE^E. 



133. Mamillaria vivipara HAW. (BiRD's-NEST CACTUS.) 

 Globose, flowers rose color, fruit a berry. On the North Den- 

 ver hills. Spring. 



134. Mamillaria Missouriensis SWEET. Globose, flowers 

 yellow, berries scarlet. North Denver hills. Spring. 



135. Cereus viridiflorus ENGELM. Globose, flowers green- 

 ish, radiating spines white and purple, central spine long, 

 white, spreading outward and upward. Hills near Berkeley. 

 Spring. 



136. Opuntia Rafinesquii ENGELM. (PRICKLY-PEAR.) The 

 flat jointed cactus with clusters of spines sparingly scattered 

 and yellow flowers. Berry becoming fleshy and often red. 

 Edible. Along the Platte and on the plains. 



