No. 17] FLOWERING PLANTS AND FERNS Pe 
Commelina Virginica L. (C. angustifolia Michx. ) 
Common on dry sandy soil. Oxford; Lost Gap; Hinds 
Co.; Coastal Islands (Tracy). 
Geol. Survey Herb. 
TRADESCANTIA. Spiderwort. 
° 
Tradescantia refiexa Raf. (T. canaliculata Raf.) 
Jackson (Dr. T. P. Bailey.) Mareh-April. 
Tradescantia Virginica L. 
Common on dry sandy soil. Oxford; Jackson. May. 
Tradescantia incarnata Small. 
Sandy soil (Small)). Spring. 
Tradescantia pilosa Lehm. 
Rich, shaded sandy soil. Chunky; Ripley. May-July. 
Geol. Surv. Herb. 
PONTEDERIACEAE. Pickerel Weed Family. 
PONTEDERIA L. Pickerel Weed. 
Pontederia cordata L. 
Sluggish streams and ponds. Coastal counties (Hilg. Ms.) 
April-July. 
PIAROPUS Raf. Water Hyacinth. 
Piaropus crassipes (Mart.) Britton. 
In floating masses on sluggish streams and ponds. Com- 
mon in southern counties; Jefferson, Wilkinson, Lafayette coun. 
ties. Coastal Regions. 
JUNCACEAE. Rush Family. 
JUNCUS L. Rush. 
Juncus effusus L: 
North Mississippi (Hilg. Ms.) June. 
Juncus Roemerianus Scheele (J. maritimus Chapm.) 
Along the Gulf Coast (Tracy). July. 
