52 METASPERMAE OF THE MINNESOTA VALLEY. 
North America: Mass. and N. J. to Minn. and Van- 
couver; S. to Gulf of Mexico and to Sacramento, Calif. 
Minn. valley: Reported from N. E. districts; rare; 
damp fields and shores of lakes or along streams. 
Panicum nudum Watt. FI. Car. (1788). 
P. dichotomiflorum Micux. FI. N. Am. (1803). 
P. divergens MunL. Gram. (1817). 
P. autumnale Bosc. Mem. (1822), 
P. fragile Kuntu, Enum. (1833). 
Wats. and Coult., Gray’s Man. 6 ed. 630; Upham, Fl]. Minn. 172; Vas., 
Mon, 33. 
North America: Ill. to S. Minn., Mo. and Tex? 
Minn. valley: Reported from S. central region; rare 
or doubtful; hillsides or plains; sandy soil. 
Panicum capillare Linn. Spec. 58 (1753). 
Milium capillare MomNcH, Meth. 203 (i794). 
? Panicum strigosum ELu. Sk. I, 126 (1821). 
Wats. and Coult., Gray’s Man. 6 ed. 630; Britt., Fl. N. J. 281; Mac., 
Fl. Can. II, 177; Wats., Fl. Calif. II, 258; Coult., Fl. Colo. 403; Webb., Fl. 
Neb. 106; Chap., Fl. So. St. 574; Upham, Fl. Minn. 172; Richt., Pl. Eur. I,’ 
26; Led., Fl. Ross. IV, 470; Wats., King Exp. 394; Cov., Fl. Ark. 232; 
Vas., Mon. 33. 
Introduced in S. Europe and Russia. 
North America: N.S., N. Br., Q., Ont. to Saskatch- 
ewan, Man., Brit. Col. and Vancouver; S. to N. Eng., N. J. 
and Fla.; W. to Pac. coast and S. Calif. 
Minn. valley: Throughout; abundant; dry fields and 
along embankments. 
HERs.: Taylor 1155, Glenwood; Sheldon 956, Redwood 
Falls; Sheldon 1460, Pipestone; Foote 8, Worthington; Oest- 
lund 340, Hennepin Co.; Sandberg 597, Red Wing; Sheldon 
1529, Lake Benton; Herb. Sheld. 1671, Minneapolis. 
CENCHRUS Linn. Gen. Corr. n. 989 (1787), p. p. 
Benth. and Hook., Gen. Pl. III. 1105; Durand, Ind. Gen. Phan. 467; 
Engler and Prantl, Nat. Pflanz. 2, II. 36 (Hackel). 
Living species: 12; tropical and subtropical regions and in 
temperate N. and S, America. N. America, 4, So. Sts., 4; E. 
Sts., 1; California, 1; Rocky Mts., 1; Pl. King., 1. 
Cenchrus tribuloides Linn. Spec. ed. II. 1488 (1762). 
C. carolinianus WALT. F). Car. 79 (1788). 
C. echinatus MUHL. Gram. 52 (1817). 
Wats. and Coult., Gray’s Man. 6 ed. 634; Britt., Fl. N. J. 282; Mac., Fl. 
Can. II. 181; Webb.,F 1. Neb. 106; Wats., Fl. Calif. I. 261; Coult., Fl. Colo. 
404; Chap., Fl. So. Sts. 579; Upham, Fl. Minn. 173; Engl. Hackel, Nat. 
