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IOWA DEPARTMENT OF AGRICULTURE 



Redtop seed appears in the market in three grades, "recleaned"' (or 

 "solid"), "unhulled," and "chaff" redtop. The latter is very misleading, 

 since it sometimes contains practically no good seed. The recleaned 

 grade sometimes contains considerable timothy, which is inexcusable 

 unless sold as mixed redtop and timothy. 



Fig-. S. — Mixture of weed seeds commonly found in low-grade alsike clover 

 seed; a, Alsike clover; b, white clover; c, red clover; d, yellow trefoil", e, Can- 

 ada thistle; f, dock; g, sorrel; h, buckhorn; 1, rat-tail plantain; k, lamb's- 

 quarters; I, shepherd's purse; m, mayweed; n, scentless camomile; o, white 

 campion; p, night-flowering catchfiy; q, oxeye daisy; r, small-fruited false 

 flax; s, cinquefoil; t, two kinds of peppergrass; u, catmint; v, timothy; x, 

 chick-weed; y, Canada bluegrass; x, clover dodder; 1, mouse-ear chock- 

 weed; 2, knot-grass; 3, tumbling - amaranth; 4, rough amaranth; 5, healall; 

 <», lady's-thumb. (Enlarged.) 



Rape, Vetch and Flax — Winter rape seed is liable to contain seed of 

 the summer rape (bird rape), an annual variety of rape not adapted to 



Seed of either winter rape or 

 summer rape may contain the 



the forage purposes of the winter rape. 



\ 



Fip - . 9. — Mixture of seeds of Kentucky blue- 

 grass (a) and Canada bluegrass (b). The 

 Kentucky bluegrass seeds are broadest at 

 the center, pointed, and have a distinct 

 ridge on each side. Canada bluegrass 

 seeds are mostly broadest near one end, 

 blunt, and smooth on the sides. (En- 

 larged.) 



seed of various wild mustards, 

 especially that of English mus- 

 tard, or wild charlock. 



Winter (or hairy) vetch 

 seed often contains seed of 

 various varieties of spring 

 vetch, from which it should 

 be free. 



Considerable flax seed is 

 imported from Russia mixed 

 with many impurities, in- 

 cluding seed of the flax dod- 

 der, a kind of dodder partic- 

 ^jM^ularly destructive to flax. 

 Seed from certain regions of 

 production in this country is 

 free from this dodder, false 

 flax seed, and other impur- 

 ities. 



