DIDYNAMIA.— GYMNOSPERMIA. 237 



HAB. Marshes. Aug. U. Stem 12— 18 in. high, 

 minutely pubes. ; fl. large, blue. 



S. gracilis : stem mostly simple ; leaves remote, 

 broad-ovate, dentate, smooth and sessile, scabrous 

 on the margin ; upper ones smaller, entire ; flow- 

 ers axillary. 



HAB. Shady rocks. June. U. Stem 8—12 in. 

 high, slend., erect ; leav. veined ; fl. very small, 



**. Flowers racemose. 



P. lateriflora: much branched, smoothish ; leaves 

 on long, petioles, ovate, dentate, sometimes cord- 

 ate, membranaceous ; racemes lateral, leafy. 



HAB. Wet meadows. July— Aug. U. Stem 1— 

 2 ft. high; racem. long ; fl. small, blue. 



S. integrifolia : stem nearly simple, densely pu- 

 bescent ; leaves subse«sile, oblong, obtuse, cuneatc 

 at the base, obscurely toothed ; racemes loose, 

 leafy. 



HAB. Swamps. June. V-. Stem 18 in. high ; fl. 

 large, blue. — Plant very bitter. 



S. hyssopifolia : minutely and densely pubescent, 

 branched ; leaves lanceolate-linear, very entire ; 

 rare. 



HAB. Swamps. June. %. Stem If t. high ; leav. 

 obtuse ; fl. very large. 



S. ovalifolia: nearly simple, pubescent ; leaves re 

 mote, rhombic-ovate, obtuse, attenuated at the 

 base into the petiole, rounded-crenate ; racemes 

 terminal, loose ; bracts lanceolate, entire. 



HAB. Rocky woods. July. U. Stem 1^—2 ft, 

 high ; lower leav. cord. ; fl. large. 



S. canescens: branched; leaves ovate, acute, petio 

 late, acutely toothe-d, under side, with the bracts 

 and flowers hoary- vi Hose ; lower leaves subcord- 

 ate ; racemes pedicellate, subpaniculate, axillary 

 and terminal ; bracts ovate-lanceolate, longer than 

 the calyx. 



IIAB. Woods. July. U. Stem 2—3 ft. high, 

 leav. large , whitish beneath ; fl. deep blue. 



