THE GENERAL CHARACTERS OF SEEDS 



433 





Figure 270A 

 PO. A. Spinach (Spinacia oleracea). 



Figure 270B 



Fig. _ 



B, Orach (Atriplex patula var. hastata). a, b, c, different views of seed in 



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 muricate 

 en 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. Koch i a 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. 

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