76 PONTEDERIACEAE 



3. Commelina Virginica L. Virginia Dav-flower. (Man. p. 240; 

 I. F. y'. 909.) In moist soil, N. Y. to 111. and Mich., Fla., Tex. and 

 probably through tropical Am. to Paraguay. —Pennsylvania : Lancaster, 

 Safe Harbor ; Franklin ; Dauphin. 



4. Conunelina erecta L. Slender Day-Flower. (Man. p. 240; 

 I. F. f. 90S.) In moist soil. Pa. to Fla., Tex., and in tropical Am. — 

 Pennsylvania : Lancaster. 



5. Commelina hirtella Vahl. Bearded Day-flower. (Man. p. 

 240; I. F. /. 906.) In moist soil, N. J. to Mo., Fla. and Tex. — Penn- 

 sylvania : Lancaster, on the Susquehanna ; York, York Furnace. 



Family 4. PONTEDERIACEAE Dumort. Pickerel-weed Family. 



Stamens 3, or rarely 1-4: perianth regular : fruit capsular, i. Heteranthera. 

 Stamens 6: perianth irregular : fruit utricular. 2. Pontederia. 



1. HETERANTHERA R. & P. 



Leaves not differentiated into blade and petiole, linear : perianth yellow. 



1. //. diibia. 

 Leaves differentiated into petiole and blade : perianth white or blue. 



2. H. reniforniis. 



1. Heteranthera dubia (J acq.) Mac M. Water Star-grass. (Man. 

 p. 243 ; I. F./. 91S.) In still water, Ont. to Ore., Fla. and Mex. Also 

 in Cuba. — Pennsylvania: Northampton; Bucks; Huntingdon; 

 Franklin ; Lancaster ; Dauphin ; Chester ; Delaware ; Erie. 



2. Heteranthera reniformis R. & P. Mud Plantain. (Man. p. 243 ; 

 I. F. /". 916.) In mud or shallow water, Conn, to N. J., 111. andKans.,La. 

 and in Central and S. Am. — Pennsylvania : Northampton ; Bucks ; 

 Berks ; Lancaster ; Dauphin ; Franklin ; York ; Chester ; Dela- 

 ware. 



2. PONTEDERIA L. 



1. Pontederia cordata L. Pickerel-weed. (Man. p. 243; I. F. 

 /. 915.) The borders of ponds and streams, N. S. to Minn., Fla. and Tex. 

 Pennsylvania : Northampton ; Monroe ; Lancaster ; York ; Sus- 

 quehanna ; Crawford ; Chester ; Lehigh ; Delaware ; Erie. 



la. P. cordata lancefolia (Muhl.) Morong. (Man.p. 243. ) Monroe; 

 Lehigh. 



ORDER 8. LILIALES. 



Styles present, distinct or united : stigmas terminal. 



Sepals and petals chaffs". Fam. i. Juncaceae. 



Sepals and petals not chaffy. 

 Styles distinct : capsule septicidal and rarely also loculicidal. 



Fam. 2. Melanthaceae. 

 Styles united : capsule primarily loculicidal. 

 Plants with bulbs, corms or woody caudices. Fam. 3. Liliaceae. 

 Plants with elongated rootstocks. Fam. 4. Con\'all.\riace.'VE. 



Styles wanting : stigmas introrse, sometimes elongated. 

 Flowers perfect. Fam. 5. Trilliaceae. 



Flowers dioecious. Fam. 6. Smilacace.ae. 



