263 THE FLORA. 



Plants mostly herbaceous, witli unsjmmetrical ^6>w7ers, without fragrance ; 

 calyx mostly 5-parted, free from the ovary, persistent; 

 corolla bi-labiate or otherwise irregular, lobes imbricated in the bud ; 

 stamens on the corolla tube, 1 or 3 of the 5 usuallj^ imperfect or mmute ; 

 ovary 2-ceUed; style 1; stigma 2-lobed; capsule 2-celled, many-seeded. 



Analysis of the Genera. 



* Herbs with the leaves alternate or all radical ... .2 



* Herbs with the leaves opposite or sometimes whorled 4 



* Trees with large cordate leaves and large blue panicles. . . .a 



2 Flowers diandrous, having but 2 perfect stamens.... c 



2 Flowers didynamous, having 4 stamens, 2 of them longer. . . .8 



2 Flowers pentandrous, having the 5 stamens all perfect b . 



8 Corolla bi-labiate, with the throat closed (personate).. ..d 

 3 Corolla bi-labiate, throat open, upper lip arched, . . .e 



3 Corolla rather bell-shaped, with 5 nearlj equal lobes f 



4 Flowers with only 2 perfect stamens g 



4 Flowers with 4 perfect stamens, the 5th scarcely appearing. ... 5 



4 Flowers with 4 perfect stamens and a 5th sterile distinct filament. . . .n 



o Corolla 2-lipped, the limb quite irregular 6 



5 Corolla limb nearly regular, with 4 or 5 plain, spreading lobes o 



6 Stamens included in the tube of corolla, generally in pairs k 



6 Stamens ascending beneath the arched upper lip m 



6 Stamens descending into the sack-shaped lower lip h 



a Corolla trumpet-shaped, stamens arched downwards. Fragrant, t Paulow'nia. 



b Corolla wheel-shaped, stamens declinate. Scentless. i/M^/e»«.VERBA3'cDM. 1 

 c Corolla 4-lobed, minute, white. Plant small. Lvs. radical. S, Amphian'thus. 

 c Corolla 4-lobed. Fls, spiked. Lvs. mostly radical. Scape If. N.-W. Synthi^ris. 

 c Corolla deeply many-cleft, variously colored. Lvs. cleft, t Schizan'thus. 

 d Corolla protracted into a spur behind. Racemes leafy. Toad-flax. Lina'ria. 2 

 d Cor. swollen into a sack behind. Eac. leafy, t Snap-dragon. Antirrhi'num. 

 e Bracts lobed, generally colored. Anth. -cells unequal. Fainted-cup. Castille''ja. 

 e Bracts and leaves entire, green. Flowers purplish. Chaff-seed. Sohwal'bea. 

 e Bracts and leaves serrate, green. Flowers yellow. Lousewort. Pedicula''eis. 

 f Tall, erect, with large, nodding flowers. Gardens. Foxglove. Digita'lis. 

 f Low and minute. Corolla equally 5-cleft. In mud. Mudwort. Limosel'la. 

 f Climbing, slender. Corolla large, gibbous at base, t Mexico. Maurax'dia. 

 f Climbing, slender. Corolla large, equal at base, t Mexico. Lophospkr''mum. 

 g Corolla labiate. Calyx 5-parted. Sterile filaments minute or 0. Grati'ola. 3 

 g Corolla labiate. Calyx 5-parted. Sterile filam. forked. Mud-flower. Ilysan'thus. 

 g Corolla labiate. Calyx 4-parted. Flowers very small. Semiflower. Hemian'thus. 

 g Corolla rotate, with 4 nearly equal Icbes, lower smallest. Speedivell. Veron^ica. 4 



