70 The Bulletin-. 



PLATE VIII. 



Shoicinr/ seeds natural she and e)ilartjed. 



a. Cat's-ear (Hypocliaeris radicata L.) Dark red. In clovers and coarse 



grasses. 



b. Hawkweed fPicris Jiirracioides L.) Reddish brown. In alfalfa, clovers, 



and grasses. 



c. Bristly Ox-tongue (Picris echioides L.) Orange or reddish yellow. In 



alfalfa, clovers, and grasses. 



d. Dandelion (Taraxacum Taraxacum (L.) Karst.) Light brown. Chiefly 



in gi'asses. 



e. Annual Sow-Thistle (S'nndius olcraccus: L.) Light lirnwn. In clovers 



and gi'asses. 



f. Spiny Sow-Thistle (Sonchus aspcr (L.) All.) Brown, thin. In grasses. 



g. Prickly Lettuce (Lactuca Scariola L.) Brown or gray, mottled. In 



grasses. 

 h. Orange Hawkweed (Hicraciuiii auruutiaiinii L.) Black, grooved, with 



white bristles. In grasses. 

 1. Small-flowered Marsh Elder (Ira axillaris I'ursh.) Gray or brown. In 



domestic alfalfa. 

 j. Rough Marsh Elder (Ira ciliata Wilhl.) Black. In alfalfa. .Tapan and 



(itlier cldvers. 

 k. Burweed Marsh Elder (Ira xaiitliiifolia (Fresen.) Nutt.) Black or gray. 



In domestic alfalfa. 

 I. Ragweed (Aiiihrosia artemisiaefolia- L.) Outer covering gray or brown, 



inner seed Imll brown, smooth. In alfalfa, clovers, grasses, and cereals, 

 m. Black-eyed Susan (Rudheckia liirta L.J Black or gray. In clovers and 



timothy. 

 n. Common Sunflower (Hclianthus anuuus L.) Gray or lirown. mottled, 



often striju'd. In domestic alfalfa and cereals. 

 o. Yarrow (Achillea Millefolium L.) White or gray, thin. In clovers and 



grasses. 

 p. Mayweed (Anthemis Cotula L.) Light to dark brown, rongh or smooth. 



In fa I'm s«'cds generally. 

 q. Field Camomile (Aiitlicmi.s arrriixis L.) Light lirown. variable in size 



and form. In clovers, grasses, and cereals, 

 r. Ox-eye Daisy (Chrys-authcmum Leucanthemum L.) Gray, ridges white, 



black between. In clovers and grasses. 

 s. Scentless Camomile (Matricaria inodora L.) Brown, the wrinkled spaces 



between the ribs i)lack. In alfalfa, clovers, and grasses. 

 t. Spear Thistle (Varduus lanceolatus L.) Straw-colored or pinkish striped 



with brown. In alfalfa, clovers, and grasses. 

 tu. Canada Thistle (Carduus arrensis (L.) Rohs.) Light lirowii. In red 



and alsike clovers, and grasses. 

 V. Blue-bottle (Ceiitauna Vi/<iinis L.) I'.lnish gray with lu'tisli of reddish 



bristles. In clovers, grasses, and cereals, 

 w. Star Thistle (Ccntaurca .^olstitialis L.) Straw-colored, with or without 



bristles, some brown, mottled. In European alfalfa and clovers. 

 X. Centaurea (Ccntaurca- Picris Pall) White in- yellowish, conspicuous. 



In Turkestan alfalfa. 



^Inlairful seed. 



