68 The Bulletin. 



PLATE VII. 



SItniriii;/ seeds natural size and enlarged. 



a. Field Dodder (Ciisciiia ai-rcnsis Bei/rich.) Pinkish or yellow in U. S. 



••ill; ill; I : liirlit t(i (lark brown in red clover. 



b. Large-seeded Dodder (Cuscuta indecora Clioisy.) Brown or gray, rough. 



only in Western U. S. alfalfa. 



c. Stickseed (Lappiihi La/ipKla (L.) Kar.^t.) Graj'ish lirown, spines often 



liidlccn off. In alfalfa, clovers, millets, and cereals. 



d. Field Scorpion-grass (llyosotis arvciisis (L.) Latii.) Seeds black, shin- 



ins. In clovers and grasses. Hulls (cuJy.res) hairy, gray. In grasses. 



e. Corn Gromwell f fJtlioxjieniniiii arveiise L.) Gray or brown, texture hard. 



In alfalfa, cbivers. grasses, vetches, millets, and cereals. 



f. Blueweed (Ech'uim vulyuvc L.) P>rown. angular, rough, otherwise as in e. 



g. European Vervain (Verhena officinalis L.) Brown or gray on one face, 



shining between the ribs. In European alfalfa, clovers, and grasses, 

 h. White Vervain ( ]'erl)(iia nrtieifolia L.) Dark brown or gray on one face, 



(lull, more robust than g. In clovers, grasses, and cereals, 

 i. Blue Vervain (Verbena hastata L.) Reddish brown or gray on one face. 



(lull, slender. In clovers and grasses. 

 j. Catnep (Xepeta Cataria L.) Light brown to dark brown, dull. In 



alfalfa, clovers, grasses, and cereals. 

 k. Heal-all (Prirnclla vuUjaris L.) Light brown, often shining. In alfalfa, 



clovers, and grasses. 

 I. Wild Sage (Sairia rerhenaea L.) Dark brown, dull. In clovers, grasses, 



Miillets. and cereals, 

 m. American Pennyroyal fHedeoiini piilegioides (L-) Pcrs.) Dark brown, 



dull. In alfalfa and <'1ov(M's. 

 n. Black or Garden Nightshade (Soliniinn iiinnnii L.) Yellowish, dull. thin. 



In clnx-crs ainl grasses. 

 o. Corn or Wall Speedwell (Veroiiieti arrensis L.) Yellowish, thin, minute. 



In clovers and fine grasses, 

 p. Rugel's Plantain fPlantar/o Riinelii Dec.) Black, thin. dull, variable in 



fiirni and size. In alfalfa, clovers, and grasses. 

 q. Buckhorn or Ribwort (I'lanlmjo lotieeoiaia L.) Amber colored or brown, 



often shining. In farm seeds generally. 

 r. Large-bracted Plantain (Plantago aristata Miehx.) Brown and gray. 



gi-annlar. In domestic alfalfa, clovers, and grasses, 

 s. Dwarf Plantain ( I'lanlnfio Virf/inica L.) Similar to q. smaller, lighter. 



In American-grown crimson clover, 

 t. Rough Buttonweed (Diodia teres Walt.) Brown or gray, haii'y. In 



.laiiMii clover. 

 u. Cleavers (doliuin Ajiarine L.) Spherical, gray, rough from short light 



colored spines. In crimson clover, grasses, nnllets. and cereals. 

 V. Blue Field-madder fShcrardia arven.^is L.) Gray, the three frail teeth 



often wanting. In clovers and grasses, 

 w. Two Species of Wild Corn Salad (I. Valeriinielht indrrisoiiii DC. 2. V. sp.) 



r.oili kinds bi-own. lig. 2 often hairy. In clovers and grasses. 

 X. Chicory (Viehariinn Intyhits L.) B.i'own. niotUed. or straw-colored. In 



alfalfa, clovers, and grasses. 



