60 The Bulletin. 



PLATE III. 



^hdiriiiij siiils iHiliiral size (iml <iiUir<i<il . 



a. Dock-leaved Persicaria ( I'ol m/oiiiini hiiKillii I'llinin L.) Seeds c-lie^^tnnt 



hi'owii, (lull, faces concave, sometimes with brown iiapcry Imll. In 

 cldvers. grasses, and cereals. 



b. Pennsylvania Persicaria (PoUigonuiii Pctuisyh-aiiiciDii L.) Seeds black 



(11- bniwn, sblninK. In red clover, grasses, and cereals. 



c. Lady's Thumb (Poh/f/oii itin I'lisicaria L.) Black, shining. Common in 



clovers, alfalfa, grasses, and cereals. 



d. Knotgrass ( I'oli/i/oinim (iriciiliirc L.J r.nnvn. dnll. In clovers, alfalfa. 



un-asses. and cereals. 



e. Black Bindweed fPoIi/f/'m inn Con rnJnihis L.) Black, dull, hnll gray. In 



gi'iisscs and cereals. 



f. Lamb's Quarters (('IiokjixhUiiiii alhidii L-) Black or gray and shining. 



hnll brown. In farm seeds generally. 



g. Halberd-leaved Orache (Atriplcx luu^tata L.) Hull brown, seed black or 



mav. In i:uro]iean alfalfa, red and crimson clovers, 

 h. Wild Saltbush (Atriplc.r tninrafa (Tory.) A. Gniif.) Hull i.crsistent. 



siraw-colored or brown. In domestic alfalfa. 

 1. Russian Thistle (Sdlsola Tntiiu.^ L.) Seed brown or green, hnll brown 



or straw-colored. In domestic alfalfa. 

 j, Rough Pigweed ( A iiiaiaiitJni.^ rcfropcxii.s L.) Black, shining, oval lens- 



shajied. In farm seeds generally. 

 k. Prostrate Amaranth (Anniruiithns hlitoidCN S. Wats.) Similar to .j. but 



l;ii-ger. more convex and circular. In domestic alfalfa. 

 I. Tumble-weed ( A)ii(tnnitli ii.^ f/raecizans L.) Sinnlar to k. but much 



smaller. In all farm seeds, 

 m. Purslane (rortuhica olciucca L.) Black, oval, tiatt<'ned. Rarely found 



ill clovers and grasses, 

 tn. Corn Cockle (A(/ro.steini)ia (lifluiflo L.) I'.i'own or black, very rough. 



.Mosllv in grasses, ndllets. and cereals. 

 0. Night-flowering Catchfly (Silciic iiovtifloni L.i Dusty gray, tubercles 



nol in distinct rows. Connnon in red and alsike clovers and cereals. 

 p. Forked Catchfly (Silnir dicliotoma EJirli.) I'.rown. tubercles in distinct 



rows. In Kni'oiiean alfalfa and red clover, 

 q. White Campion (Lyvlniis <ilhu Mill) Light gray, tubercles black tippetl. 



In European red and crimson clovers and coarse grasses. 

 r. Cow-herb fVnccarid Vaccaria (L.) Britton.) Black, splu'rical. surface 



finely tul)ercled. In domestic alfalfa and cereals, 

 s. Common Chickweed (Alsiiic inolia L.) B<'ddisb brown, flattened, tu- 



bercled. In farm seeils gen(>rally. 

 t. Large Mouse-ear Chickweed (Cerastimn viil(/(itiiin !..) Reddish, lulier- 



( les (birk<'r. In clovers, gi'asses. and cereals. 

 u. Thyme-leaved Sandwort ( Areiiaria. scrinjUifoHa L.) I'dack. minute. In 



cbi\'ei's and grassi's. 

 V. Sandwort fArciiaria s/).) Gray or mottled. In Lnropi'an crimson clover. 

 w. Spurry i Sftcrf/iila arrciisi.s L.) Black, rim lighter, thick lens shaped. In 



chi\-ers and grasses. 

 X. Knawel ( Sclci-aiilli i(.^ innniiix L.) Straw-cidored. In crimson clover and 



grasses. 



jViihiicfnl .seed. 



