PLATE 19. 



WHITE EVENING-PRIMROSE, Amgra pallida (Lindley) Briiton, 

 var. leptophylla, Nutt. 



Other English name : White-stemmed Evening-primrose. 



Other Latin name : (Enothera albicaulis, Nutt. and Canadian authors. 



Native. Perennial. Sterns mostly simple, shining white, sparsely 

 pubescent above, somewhat decumbent, about 3 feet high ; the leaves from 

 1 to 4 inches long, narrow and waved, but usually entire in our north-west- 

 ern plant. Hoots white and fleshy, wide-spreading and throwing up flower- 

 ing stems at intervals, thus forming large patches. Flowers axillary, large 

 and handsome, lA inches across, waxy-white turning pinkish as they fade, 

 open in day time, odour unpleasant. Tips of the calyx-segments at the 

 end of the buds free as 4 little points. Capsules narrow and curved, four- 

 angled, about one inch long with the seeds in single rows in the 4 cells. 

 Seeds [Plate 53, fig. 16 — natural size and enlarged 8 times] about jV 

 of an inch long, normally spindle-shaped but angular and somewhat 

 twisted by compression in the pod, smooth and mucilaginous when soaked, 

 yellowish brown (under the microscope, minutely dotted with black and 

 faintly striate lengthwise). 



This plant has usually been referred to in Canadian works as (Enothera 

 albicaulis, but all the plants I have been able to examine are either the above 

 named variety, or possibly (E. Nuttallii (Spach) Eydb. True (Enothera 

 (Anogra) albicaulis has the calyx segments closely joined together at the tips 

 of the buds and the seeds are quite different, being bright yellow, lemon- 

 shaped and pitted all over the surface. 



Time of Flowering : July-August ; seeds ripe September. 



Propagation : By seeds and extensive deep-running fleshy rootstocks, 

 every part of which when broken will throw out shoots and form new plants. 



Occurrence : Sandy land; Manitoba and westward to British Columbia. 



Injury : This deep-rooted perennial is very persistent in sandy land. 



Remedy : Summer-fallow with deep or shallow ploughing, according 

 to the nature of the soil, after the growth has been made in summer. Culti- 

 vate in fall or in spring before seeding to a crop. 



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