350 MISC. PUBLICATION 200, U. S. DEPT. OF AGKICULTURE 



Figure 718.— Distribution of 

 Atopecurus carolinianus. 



N^ 



fc 



^ 



1. Polypogon monspeliensis (L.) Desf. Rabbitfoot grass. (Fig. 

 721, A.) Annual; culms erect or decumbent at base, 15 to 50 cm 

 tall (sometimes depauperate 

 or as much as 1 m tall); 

 ligule 5 to 6 mm long; blades 

 in average plants 4 to 6 mm 

 wide; panicle dense, spike- 

 like, 2 to 15 cm long, 1 to 

 2 cm wide, tawny-yellow 

 when mature; glumes his- 

 pidulous, about 2 mm long, 



the awns 6 to 8 mm long, rarely longer; lemma 

 smooth and shining, about half as long as the 

 glumes, the delicate awn slightly exceeding them. 

 O — Ballast and waste places, New Brunswick 

 to Georgia, west to Alaska and CaliforniaC infre- 

 quent in the East, mostly confined to the coaital 

 States, a common weed in the Western States; 

 at low altitudes, south to Argentina (fig. 722); 

 introduced from Europe. 



2. Polypogon maritimus 

 Willd. (Fig. 721, B.) An- 

 nual; culms 20 to 30 cm tall, 

 upright or spreading; ligule 

 as much as 6 mm long; 

 blades usually less than 5 

 cm long, 2 to 4 mm wide; 

 panicle mostly smaller and 

 less dense than in P. monspel- 

 iensis; glumes about 2.5 mm 

 long, hispidulous be- 

 low, the deep lobes 

 ciliate-f ringed , the 

 awns 7 to 10 mm long; 

 lemma awnless. o 

 — Introduced, Georgia 

 (Tybee Island), Cali- 

 fornia (Napa and New 

 York Falls, Amador 

 County) ; Mediterra- 

 nean region. 



3. Polypogon lutosus 

 (Poir.) Hitchc. Ditch 

 polypogon. (Fig. 723.) 

 Perennial; culms tuft- 

 ed, geniculate at base, 

 30 to 80 cm tall; ligule 

 2 to 5 mm long or the 

 uppermost longer; 

 blades commonly 4 to 

 6 mm wide ; panicle ob- 

 long, 5 to 15 cm long, 

 more or less interrupt- 

 ed or lobed; glumes equal, 2.5 to 3 mm long, scabrous, the awns 3 to 5 



Figure 717.— Alope- 

 curus carolinianus. 

 Plant, X 1; glumes 

 and floret, X 10. 

 (Kearney 1147, Va.) 



Figure 719.— Atopecurus howellii. 

 Panicle, X 1; glumes and floret, 

 X 10. (Gilbert 78, Oreg.) 



Figure 720.— Alopecur us sac- 

 catus. Panicle, X 1; glumes 

 X and floret, 10. (Suksdorf 

 188, Wash.) 



