DIDYNAMIA ANGIOSPERMIA. 391 



HAB. Rocky hills. July, Tj.; afoot high, hairy; leaves rugose, 

 Jlower blue. 



277. LIMOSELLA. 



L. subulata : leaves linear, very narrow, scarcely dilated at the apex ; 



scape 1-flowered, as long as the leaves. 

 HAB. Muddy shores. Aug. Tj.; an inch high; eaves radical; 



flowers minute, bl. white. 



278. SCROPHULARIA. Figwort. 



S. marilandica : leaves cordate, serrate, acute, rounded at the base ; 



petioles ciliate below ; panicles fasciculate, loose, few-flowered ; stem 



obtusely angled. 

 HAB. Woods. July Oct. '4; stem 2 4 feet high, smooth ; leaves 



thin; flowers greenish-purple. 

 S. lanceolata : leaves lanceolate, unequally and incisely serrate, acute 



at the base ; petioles naked ; fascicles of the panicle corymbed. 

 HAB. Woods. Aug. 7| ; stem 3 feet high, smooth ; leaves repand. 



serrate ; Jlower greenish purple. 



279. ANTIRRHINUM. Toad-flax. 



A. Linaria : leaves linear-lanceolate, crowded ; spikes terminal ; 



flowers imbricate ; calyx smooth, shorter than the spur. 

 HAB. Road-sides, &c. June Nov. 9L; stem 1 2 feet high ; leaves 



pale green ; flowers yellow. . 

 A. canadense: assurgent, smooth, mostly simple; leaves scattered, 



erect, linear, obtuse ; flowers racemose ; scions procumbent. 

 HAB. Wet or dry soils. July Nov. <g) ; a foot high, very slend. ? 



fl. very sm., blue. 



280. GERARDIA. 



* Flowers purple. 



G. purpurea : stem angular, much branched ; leaves scabrous-linear, 

 long and acute; flowers subsessile; segments of the calyx subu- 

 late. 



HAB. Sandy soils and swamps. August Oct. <v) ; stem I 2 feet 

 high, slend. ; fl. large, axill. 



G. maritima : stem angular ; leaves linear, fleshy, short, rather obtuse ; 

 flowers pedunculate ; upper segments of the corolla ciliate ; calyx 

 truncate, with minute teeth. 



HAB. Salt marshes. July Sept. <v) ; stem 6 12 in. high ; fl. 

 middle-sized. 



G. t'enuifolia : much branched ; leaves linear, acute, scabrous ; pedun- 

 cles axillary, longer than the flowers ; teeth of the calyx acute. 



HAB. Fields and woods. Aug. Sept. <5) ; stem 6 10 in. high ; 

 fl. spread, smooth. 



Gr. auriculata : subsimple, scabrous ; leaves ovate, lanceolate, auricu- 

 late at the base, very entire, sessile ; flowers sessile, axillary 



