OCTANDRIA TRIGYNIA. 357 



tern ate, subsolitary ; leaves linear, acuminate, straight; stipules tubu- 

 lar, lacerate, with the segments finely attenuate at the extrunity. 

 HAB. Rocks and sandy fields. July September, <S> ; stem 6 10 

 inches high ; ang. scab. 



* * Flowers spiked. 



t Spikes axillary or terminal ; stamens 5 8 ; stigmas mostly 2 ; 

 nut ovate. PERSICARIA. 



P. punctatum : flowers octandrous, glandular-punctate ; styles 3-part- 



ed ; stipules slightly hairy, ciliate ; spike filiform, at first cernuous ; 



leaves lanceolate, with pellucid punctures, scabrous on the margin 



and midrib. 

 HAB. Wet places. Aug. October, 1|.; stem l feet high; flower 



white plant acrid. 

 P. mite : flowers octandrous, somewhat crowded ; styles 3-parted ; 



leaves narrow-lanceolate, somewhat hairy ; stipules hairy, with long 



ciliae. 

 HAB. Wet places. August September, 1}.; stem 18 inches high : 



flower pale red or white ; plant not acrid. 

 P. virginianum : flowers four-cleft, unequal, remote, pentandrous ; 



styles 2 ; spike very long, virgate ; leaves oval-lanceolate. 

 HAB. Moist shady places. August September, r l\.; stem 2 4 feet 



high ; flower white ; fr. birost. 

 P. amphibium : flowers pentandrous ; styles bifid ; spike oblong or 



ovate ; leaves petiolate, oblong or lanceolate, subcordate. 



a. terrestre : stem nearly erect ; leaves oblong- lanceolate, often cordate 

 at the base, smooth above, slightly pubescent beneath ; spike ovate- 

 oblong. 



HAB. Borders of ponds. August, 7]. ; stem assurgent, 8 inches 

 high ; spike bright rose color. 



b. aquaticum: leaves floating, ovate-lanceolate; spike cylindrical-ob- 

 long. 



HAB. Floating in lakes. August, 1|_; stem3 IQft. long, branch.; 



flower rose-color. 

 P. pennsylvanicum : flowers octandrous ; style 2-cleft ; spike oblong, 



crowded ; peduncles hispid ; leaves lanceolate, slightly hairy ; stip- 

 ules smooth and naked. 

 HAB. Fields, and along ditches. July October, <v) ; stem 2 4tfeet 



high ; leaves pale green ; flower red. 

 P. lapathifolium : flowers hexandrous ; styles 2 ; spikes oblong, rather 



crowded, erect ; peduncles scabrous ; leaves ovate-lanceolate, on short 



petioles, hoary. 

 HAB. Wet places. August, <v) ; stem 2 4 feet high, leaves pale 



green. 

 P. persicaria : flowers hexandrous ; styles bifid ; spikes ovate-oblong, 



erect ; peduncles smooth ; leaves lanceolate ; stipules smooth, c3- 



iate. 

 HAB. Low grounds. July August, <v) ; stem 1 2 feet high 



spikes dense, rose-colored. 

 P. orientale: flowers heptandrous, digynous, leaves ovate; stem erect; 



stipules hairy, hypocrateriform. 



