ELEAGNACEyE — ONAGRACE^ 93 



O. polyac^ntha, Haw. 



Prostrate, the joints light green, ovate or orbicular, forming large spread- 

 ing masses, covered with spiny tubercles; leaves minute; flowers yellow, 

 sometimes orange within or rarely purple; fruit dry and spiny. Dry 

 prairies and hillsides, W. Man.-Alta. 



LVIII. ELEAGNACE^ (Olbastee Family). 



Shrubs with simple scurfy leaves, and regular perfect or dioecious 

 flowers; calyx eolore(i, mostly 4-cIeft; petals wanting; stamens 

 as many or twice as many as the calyx teeth; fruit drupe-like or 

 berry-like, owing to the thickening of the calyx tube. 



1. ELEAGNUS. 



Calyx teeth 4, deciduous; stamens 4, inserted in the throat of the 

 calyx; style linear with the stigma down one side ; fruit drupe-like; 

 leaves alternate. 



1. E. argentea, Pursh. Silverberry; Wolf Willow. 



A thornless shrub with silvery leaves and numerous flowers, silvery with- 

 out and yellow within, and very fragrant; fruit dry. Common on rich 

 prairie, Man.-Alta. 



2. SHEPHERDIA. 



Flowers dioecious; calyx 4-cleft; stamens 8; style slender, 

 stigma down one side; fruit pulpy, berry-like; leaves opposite. 



1. S. canadensis, (L.) Nutt. 



A thornless shrub 3-8 ft. high; leaves elliptical, almost naked above, 

 silvery-scurfy beneath; fruit yellowish red. Wooded valleys, N. Sask., Alta., 

 and northward. 



2. S. argentea, Nutt. Buffalo Beebt. 



A thorny shrub higher than the preceding; leaves silvery on both sides; 

 fruit scarlet. Valleys of Red, Assiniboine and Souris Rivers, and westward 

 to Alta. 



LIX. ONAGRACE.^ (Evening Primrose Family). 



Herbs with either alternate or opposite leaves and regular, sym- 

 metrical, usually 4-parted flowers; calyx adheres to the ovary and 

 may project beyond in a long tube; petals sometimes wanting; 

 stamens as many or twice as many as the calyx lobes or petals; 

 ovary 2 or 4-ceUed; style slender; stigma often deeply lobed. 



