IOWA ACADEMY OP SCIENCES. 
195 
ALISMACE^. 
Alisma. 
11. A. flantago-aquatica L. {A. plantago L.) Abundant 
everywhere in wet ground. 
Sagittaria. 
12. S. latifolia Willd. {S. variahilis Eng.) Abundant 
in swamps and wet ground. 
13. S. rigida Pursh. {S. heterophylla rigida Eng.) 
Frequent near ponds and swamps. 
GRAMINE.^. 
Andropogon. 
14. A. scoparius Michx. Common in dry uncultivated 
and unpastured ground. 
15. A, furcatus lAwhl. Same habitat as the preceding; 
common. 
Chrysopogon. 
16. C. avenaceus (Michx.) Benth. Same habitat as the 
two preceding; common. 
Syntherisma. 
17. S. sanguinalis (L.) Nash. [Panicum sanguinale L.) 
Common, especially in cultivated ground. 
18. S. linearis (Krock.) Nash. {Panicum glahrum Gau- 
din.) An abundant and troublesome weed in 
lawns, gatdens and waste ground. 
Panicum. 
19. P. crus-galli L. Abundant in moist ground , especially 
about buildings. 
20. P. porter ianum Nash. {P.latifolium Walt.) Fre- 
quent in woods. 
21. P. xanthophysum A. Gr, Dry, open ground; in- 
frequent. 
22. P. scrihnerianum Nash. (P. scoparium Wats.) Dry 
open ground; frequent. 
23. P. puhescensJ^dim. {P. dichotomum L. — apparently; 
which species, as limited by -Britton, has the culm 
and leaves nearly glabrous and does-not occur as 
