370 DECANDRIA PENTAGYN1A. 



HA8. Sandy fields. June Aug. ; stem 6 10 inches high ; 

 leaves filiform., 8 10 wkorled. . 



S. sag inoides : glabrous ; leaves opposite, subulate, awnless ; pedun- 

 cles solitary, very long, smooth. 



HAB. Sandy fields. July, ; stem spread., 2 3 inches long ; 

 peduncles axillary and term. 



219. CERASTIUM. Mouse-ear duckweed. 



C. vulgatum ; hairy and viscid, cespitose, suberect; leaves ovate, 



flowers capitate, longer than their pedicels. 

 HAB. Fields and dry hills. May September, <v) ; plant pale 



green, -viscid when young. . 

 C. viscosum : hairy and viscid, spreading ; leaves oblong-lanceolate ; 



flowers somewhat panicled, shorter than their pedicels. 

 HAB. Fields and road sides. May September, 7]. ; darker green, 



spreading, rarely vise. 



220. AGROSTEMMA. Corn-Cockle. 



A. Githago : hairy ; calyx much longer than the corolla ; petals en- 

 tire, without a crown. 



HAB. Corn-fields. June July, ; plant pale green, 2 feet high; 

 Jlower large, purple. 



221. OXALIS. Wood-sorrel. 



* Stemless. 



O. Acetocella: stemless; scape 1-flowered, longer than the leaves; 

 leaves ternate, dilated-obcordate, pilose ; styles as long as the interi- 

 or stamens ; root dentate. 



HAB. Mountains. June, 1\. ; leaves often purple beneath Jlow- 

 er s large, wh. veined. 



O. violacea: stemless; scape umbelliferous; flowers nodding ; leaves 

 ternate, obcordate, smooth ; segments of the calyx callous at the tip ; 

 styles shorter than the exterior stamens ; root squamose. 



HAB. Rocky woods. April June, '4; root thick, with ciliate 

 scales fl. violet. 



* * Caulescent. 



O. stricta : hairy ; stem erect, branched ; leaves ternate, obcordate , 

 umbels longer than the petioles ; petals obovate, entire ; styles as 

 long as the interior stamens. 



HAB. Sandy fields. May Aug. ^ 1 stem 410 in. high, never 

 creeping -ft. sm., yel. 



222. PENTHORUM. Virginia Stone-crop. 



P. sedoides : stem branched, angular above ; leaves lanceolate, subses- 

 sile, unequally serrate ; spikes simple, secund, recurved, paniculate ; 

 seeds elliptical. 



