ONAGRACE^. (EVENING PRIMROSE FAMILY.) 59 



2. C. casspitosa, Haw worth. Similar to the last; smooth glaucous-green; flowering 

 branches 6 to 12 inches high, with broadly triangular-ovate clasping leaves. The most 

 common species. 



TILL^A MINIMA, Miers., a small herb 1 to 3 inches high with clusters of minute white flow- 

 ers in the axils of the opposite leaves is a common under-herb in moist places; as is also T.angusti- 

 folia, Nutt., only an inch high with solitary flowers. 



Order LYTHRACB^ is represented by Lythrum alatum, Pursh., var. llneari/oUum, 

 Gr. An herb a foot or two high with angled stemes and small deep purple 6-petaled 

 flowers solitary in the axils of the entire sessile leaves. 



Ordeb 24. ONAGRACEiE. 



Herbs (snnibby exotics), with the parts of the flowers in fours, the calyx tube adnate 

 to the ovary, the petals borne on its throat, and the stamens as many or twice as many. 

 Style always single. 



Aquatic stems creeping Jussiaea. 1 



Flowers scarlet, fuchsia-like Zauschneria. 2 



Flowers small, purplish, leaves mostly opposite Epilobium. 3 



Anthers attached near the center CEnothera. 4 



Flowers purple, calyx lobes reflexed Godetia. 5 



Petals clawed, calyx-tube short Clarkia. 6 



Petals clawed, calyx-tube filiform Eucharidium. 7 



Flowers purple in leafy spikes Boisduvalia. 8 



Flowers minute, white, parts in twos Circaea. 9 



1. JUSSIiEA, L. 



The 4 to 6 herbaceous lobes of the calyx j^ersistent. Petals as many, obovate, spread- 

 ing, yellow. Stamens twice as many. Capsule clavate. 



1. J. repens, L., Var. Californica, Wat. Characterized sufficiently by its 

 creeping stems and its solitary axillary flowers nearly an inch in diameter. 



2. ZAUSCHNERIA, Presl. 



Tube of the calyx much prolonged beyond the linear ovary, colored, the 4-lobed 

 limb with 8 small deciduous scales, 4 erect and 4 deflexed. Stamens 8, exserted. 



1. Z. Californica, Presl. The scarlet fuchsia-like flowers over an inch long cannot 

 be mistaken. 



3. EPILOBIUM, L. Willow-herb. 



The seeds tufted with silky hairs in linear 4-sided, 4-valved capsules best mark this 

 difficult genus. 



