262 DAVENPORT ACADEMY OF SCIENCES. 



Trillium, L. Wake Robin. Birthroot. 



813. T. recurvatum, Beck. 

 Rich woods ; infrequent. 



814. T. erect urn, L. 



Rich woods; scarce. Flowers white, rather small. 



PONTEDERIACE^. 



Pontederia, L. 



815. P. cordata, L. Pickerel-weed. 



Ponds and slowly-flowing waters ; frequent in Muscatine Co. 



Heteranthera, Ruiz. & Pav. 



816. H. graminea,Vah\. Mud Plantain. 

 Mud and shallow water ; infrequent. 



XYRIDACEiE. 



Xyris, Gronov. 



817. X. f/exuosa, Muh\. Yellow- eyed Grass. 

 Bog^y places near Cedar River; rare. 



COMMELINACE^E. 



Commelina, Dill. 



818. C Virginica, L. 



Dry sandy soil along railroad tracks near Fruitland. 



Tradescantia, L. Spiderwort. 



819. T. Virginica, L. 

 Railroad tracks ; common. 



820. T. Virginica, var. villossa, Watson. 



Sandy soil, Cedar River region. Flowers are often light rose- 

 color. 



JUNCACEjE. 



Juncus, Tourn. Rush. 



821. J. marginatus, Rostk. 



Muscatine county ; infrequent. 



822. J. tenuis, Willd. 



Fields, roadsides, etc.; common. 



823. J. acuininati/s, Michx. 



Muscatine county ; infrequent. 



