32 IOWA ACADEMY OF SCIENCE 
ZANNICHELLIA (Michx) L. 
32. Z annichellia palustris L. Horned Pondweed. Scarce in bayous 
and sluggish streams. 
NAJAS L. 
33. Najas flexilis (Willd.) Rostk. & Schm. Soft Naiad. In ponds and 
springs. 
ALISMACEAE. 
SAGITTARIA L. 
34. Sagittaria longirostra (Mitch.) J. G. Sm. Long-beaked Arrow- 
head. A peculiar form with obovate achenes, winged all 
around and the beak nearly erect, has been taken rarely. It 
is placed here with some hesitation but can fit no other de- 
scribed species. 
35. Sagittaria latifolia Willd. Broad Leaved Arrowhead. Common 
in marshy places. 
36. Sagittaria arifolia Nutt. Arum Leaved Arrowhead. Not rare in 
marshes along the Iowa River. 
HYDRO CHARITACEAE. 
ELODEA Michx. 
37. Elodea canadensis Michx. Water Weed. In bogs and marshes. 
GRAMINEAE. 
ANDROPOGON (Royen) L. 
38. Andropogon scoparius Michx. Broom Beard Grass. Abundant 
in dry soils. 
39. Andropogon tennesseensis Scrib. Tennessee Beard Grass. Dry 
meadows. 
40. Andropogon fur catus Muhl. Forked Beard Grass. Very common. 
SORGHASTRUM Nash. 
41. Sorghastrum nutans (L.) Nash. Indian Grass. Common in dry 
soils. . 
