iowa academy of sciences. 207 



Panicum L. 



41. P. scyihnerianuyn Nash. {Panicum 2^(inc{florHm A. 



Gray.) Dry prairies and knolls; common. 



42. P. dichotomnm L. Dry knolls; a hirsute form; in- 



frequent. 



43. P. depanpcratum Muhl. Dry ground, woods and 



prairies; rare. 



44. P. virgatum L. Very common. 



45. P. capillare L. Very common, as well as useless. 

 Ch.^tochloa. Scribner. Fox-tail grass. 



46. C ijlauca (L.) Scribner. {I.ropJionis glauciis (L.) 



Nash. Setaria (/laHca Beauv.) A very trouble- 

 some weed, introduced in cultivated fields. 



47. C. viridis (L.) Scribner. ilxopliorus vlridis (L.) 



Nash. Setaria viridis Beauv.) Introduced like 

 the preceding, but less common. 



ZiZANiA L. Wild Rice. 



48. Z. aquaticn L. Common in marshes. The seeds of 



this annual grass during very dry seasons will lie 

 dormant, only germinating when the proper 

 conditions of moisture exist. 



HOMALOCENCHRUS Micg. 



49. H. virginicus (Willd.) Britton. {Leerzia virglnica 



Willd.) Low places in woods; common. 



50. //. ori/zoides (L.) Poll. {Leerzia orgzoides Sav.) 



Common in marshes, and along streams. 

 Phalaris L. 



51. P. ariindinacea L. Rare, near Armstrong. 

 Savastana Schrank. Sweet vernal Grass. 



52. S. odorota (L.) Scribner. {Hierochloa borealisU. and 



S.) Our earliest flowering grass; common in low 

 ground, and quite difficult to subdue. 

 Stipa L. 



53. S. spartea Trin. Porcupine Grass. Common in high 



prairies. 

 Oryzopsis Michx. 



54. 0. meJanocarpa Muhl. Frequent in woods. 



