106 
IOWA ACADEMY OF SCIENCES. 
(7. interior Bailey. Bull. Torr. Bot. Club, 20: 426, N. 1883. 
Probably common. Probably confused formerly in Iowa as 
some form of G. ecMnata Murray. Not before reported from 
Iowa. 
C. cephalophora Muhl. Mr. A. S. Skinner, coll. Determined 
by Mr. Cratty, 
G. tribulo'des Wahl. Wet ground, frequent. 
G. tribuloides Wahl., var. reducta Bailey. Wet ground, 
probably frequent. 
(7. tribuloides Wahl, yar. bebbii Bailey. Mr. A. S. Skinner, 
coll. Determined by Mr. Cratty, who also saw the other two 
forms of the species. 
G. scoparia Schkuhr. Low ground, frequent. 
G. straminea Willd. Low ground, frequent. 
GRAMINE^. 
Spartina cynosuroides Willd. Low prairies, common. 
Panicum glabrum Gaudin. Waste ground, frequent. 
P. sanguinale L. Cultivated and waste ground, common. 
P. proliferum Lam. Waste ground, infrequent. 
P. capillare L. Waste and cultivated ground, common. 
P. virgatum L. Low prairies, infrequent. 
P. latifolium L. Woods, frequent. 
P. dicliotomum L. Woods and waste ground, common. 
P. crus- gain L. Waste ground, common. 
Setariaglauca'Bed^VLY. Cultivated and waste ground, abundant. 
S. viridis Beauv. Cultivated and waste ground, abundant. 
S. italica Kunth. Frequently escaped. 
Genchrus tribuloides L. Sandy soil, common. 
Leersia virginica Willd. Wet ground, frequent. 
L. oryzoides Swartz. Wet ground, frequent. 
Zizania aquatica L. Ponds, infrequent. 
Andropogon furcatus Muhl. Prairies, common. 
A. scoparius Michx. High prairies, frequent. 
Glirysopogon nutans Benth. Prairies, frequent. 
Phalaris arundinacea L. Wet ground, infrequent. 
Stipa spartea Trin. High prairies, infrequent. 
Oryzopsis melanocarpa Muhl. Rocky woods, infrequent. 
Mulilenbergia glomerata Trin. Low ground, common. 
M. mexicana Trin. Low ground, frequent. 
M. sylvatica Gray. Woods, frequent. 
M. diffusa Schreber. Woods, infrequent. 
Brachyelytrum aristatum Beauv. Rocky woods, frequent. 
