ONAGRACEAE (EVENING PRIMROSE FAMILY) 297 



outer edge, lustrous golden yellow, open in the daytime ; tube of 

 the calyx much longer than the ovary, its lobes narrowly lance- 

 shaped and spreading. Capsules about a half-inch long, four- 

 angled, and having four small wings projecting from the top, the 

 base often narrowed abruptly to a short foot-stalk. 



Means of control 



Starvation of the perennial roots by frequent, successive, close 

 cuttings. In cultivated ground the plants are destroyed by the 

 required tillage. 



BIENNIAL GAURA 

 Gaiira biennis, L. 



Native. Biennial. Propagates by seeds. 



Time of bloom : July to September. 



Seed-time: August to October. 



Range: Quebec and Ontario to Minne- 

 sota, southward to Georgia, Missis- 

 sippi, Arkansas, and Nebraska. 



Habitat : Fields, meadows, pastures, road- 

 sides, and waste lands. 



The winter rosettes and deep-boring 

 taproot of this plant resemble those of 

 the Evening Primrose, to which it is a 

 near relative. Flowering-stalks, which 

 appear in the second year, are two to 

 five feet tall, erect, much branched, 

 and covered with finely downy hairs, 

 hard and woody when mature, and very 

 troublesome to harvesting machinery. 

 Leaves alternate, lance-shaped, pointed 

 at both ends, sparsely toothed or wavy- 

 edged, smooth above but finely hairy 

 beneath, sessile, two to four inches long. 

 Flowers sessile on slender terminal spikes, 

 the succession of bloom beginning at the 

 base of the spike with hairy buds above ; 

 each blossom is nearly a half-inch across, pio. 207. Biennial Gaura 

 with four cream-white petals, turning (Gdum biennis). 



