THE GENERAL, CHARACTERS OF SEEDS 



469 



Blue Vervain (Verbena) hastata L.). 



Nutlets 3-sided, with a distinct line of separation, back' convex, 

 rugose, inner face 2-sided; one^^fifteenth to one-thirteenth in. long; 

 color light brown; sear slightly elevated, whitish, at base of nut- 

 let. Often found in seed of clover. 



Hoary Vervain [Verbena striata Vent.). 



Nutlets cylindrical, 3-sided, one-eighth in. in length, outer face 

 convex, back with 4 prominent veins, upper portion slightly pitted ; 

 color dark brown; whitish scar at base. Seed found in clover. 



Fig. 336. A. Hoary Vervain (.Yeriena strtcto). B. White Vervain iVertena 



urticaefolia). 

 (A, drawing by Li. R. Collins; B, after Hillman, Bull. Mich. Agr. Exp. Sta.) 



"White Vervain (Fer&ewa itrftcae/oKa L.). 



Nutlets cylindrical, convex on back, 2-faeed on inner sdde, with 

 prominent central line; one_-tenth to one-eighth in,, in, length; back 

 somewhat rugose, with 2 or 3 prominent lines extending from base " 

 to apex and some cross lines; inner face somewhat grajQular; scar 

 a whitish elevated point. Found in seeds of clovers. 



LABIATAE, MINT FAMILY. 

 Catnip (Nepeta cataria L.). 



Oval, dark brown seeds, about 1.5 mm. in length, slightly flat- 

 teiied, surface smooth ; one face bears a broad central, longitudinal 

 ridge, the base of which is marked by two white characteristic 

 spots, which are a part of the scar. 



American Germander (Teucrium canadense L.). 



Nutlets obovoid, one-tenth in. in length, outer surface convex ; 

 color brown ; surface prominently rugose, reticulated except the scar 

 at the lower end. Common in commercial seed. 



