EVENING PRIMROSE FAMILY. Onagracess. 



the golden pollen is loosely connected by cobwebby 

 threads, and is transported from flower to flower mostly 

 by moths ; IJie Isabella tiger-moth (Pyrrharctic Isabella) 

 is chief among the number. The blossoms are also fre- 

 quented by the honeybee and bumblebee ; they usually 

 open just before sundown, and fade in the strong sun- 

 light of the following day ; the sudden opening of the 

 flower in the twilight hour is interesting and remark- 

 able. The soft-hairy plant-stem, leafy throughout, is 

 1-6 feet high. Roadsides and fields everywhere east of 

 the Rocky Mountains. The flower of var. grandiflora, 

 from the southwest, is very large ; the corolla is 3-4 

 inches in diameter. It is commonly cultivated. The 

 var. cruciata has remarkably narrow petals linear and 

 acute ; Mass., Vt., and N. Y. 



Oakes's Even- An annual, slenderer than the foregoing 

 ing Primrose species, and not hairy but covered with 



^akesidna & SUght Cl S6 woolliness - The Calyx-tips 



Pure S yeHow not conspicuously close together. Dry 

 July- August situations Mass, and N. Y., west to Neb. 

 CEnothera ^ ^ wer slightly fine-hairy species with 



sinuata oblong or lance-shaped leaves wavy- 



Pure yellow toothed or often deep-cleft like those of 

 May-July t j ie dandelion ; the small light yellow 



flowers borne at the bases of the leaves turn pinkish in 

 fading. About 1 foot high. In sandy soil, from N. J. 

 south, and west to S. Dak., Kan., and Tex. Also in Vt. 

 according to Britton and Brown, but not recorded by 

 Brainerd, Jones, and Eggleston, in Flora of Vermont. 



A small slightly hairy biennial, with di- 

 (Enothera urnal, rather small pure yellow flowers, 

 pumila borne in a loose spike or at the bases of 



Pure yellow the leaves, the latter light dull green, 

 May-July toothless and obtuse, lance-shaped but 

 broader nearer the tip. 10-20 inches high. In dry sunny 

 fields, from Me. to N. J., and west to Minn, and Kan. 



298 



