THE GENERAL CHARACTERS OF SEEDS 



433 



Figure 270A 

 Fia. 270. A. Spinach iSpinacia oleracea). 



a, b, 



Figure 270B 

 different views of seed in 



B. Orach (Atriplex patula var. hastata) 



envelope ; d, e, f, views of seeds. 

 (A, drawing by Charlotte M. King; B, after Hillman, Bull. Mich. Agr. Exp. Sta. ) 



Orach {Atriplex patula var. hastata (L.) Gray). 



Fruiting bracts ovate-triangular, entire toothed, often murieate 

 on the back, united to near the middle ; seed jet black, shining, 

 nearly circular, edge bluntly rounded, bearing a notch; a groove 

 leads from protuberance on the margin part way to center of face. 



Russian Thistle {Salsola kali var. tenuifolia G. F. W. Mey.). 



Calyx persistent, 5-parted, membranaceous, enclosing the flat- 

 tened utricle by a broad, flat, membranaceous wing; seed conical. 



Figure 271A 



Figure 271B 



Fig. 271. A. Russian Thistle (Salsola kali var. tenuifolia), a, seed in envelope; 



b, d, e, views of seed enlarged ; c, natural size. 

 B. Kochia or Mexican Fireweed (.Kochia scoparia). 



(A, after Hillman, Bull, Mich. Agr. Exp. Sta.; B, drawing by Miss King.; 



upper end truncate, with a depression one-eighteenth in. in 

 diameter, brownish; seed without endosperm, embryo coiled in a 

 spiral; cotyledons slender. 

 38 



