OHDER 81. BUTTERWORTS. 257 



AKME'RIA vulga'ris, Thrift, is another sea-coast plant, sometimes cultivated, hay- 

 ing a tuft of linear leaves at base, and a bunch of rose-colored flawer? at top of the 

 scape. 



PLDMBA'GO Capen'is, Leadwort,ha pale blue fls. resembling Phlox. Cultivated. 



ORDER LXXXI. LENTIBULACEJ3. Butterworts. 



Herbs growing in water or wet places with bilabiate flowers on scapes; 

 calyx of 2 or 3 sepals. Corolla with a spur behind, throat bearded ; 

 stamens 2, included. Styles, 2, ovary free, capsule many-seeded. 



Analysis of the Genera. 



\ Leaves broad, entire. Corolla throat open. Calyx 5-parted. Growing 



in wet rocky places, chiefly South. Butterwort, PINOUICTTLA. 



Leaves finely dissected, sometimes 0. Corolla throat closed. UTKICULARIA. 1 



1. UTRICULA'RIA. Bladderwort. 



Calyx 2-parted. Corolla irregularly bilabiate, spurred. Stamens 2. 

 Stigma 2 lipped. Pod round, 1-celled. Plants loosely floating or fixed ill 

 the mud. Leaves mostly present, furnished with little sacks (utricles) filled 

 with air which floats them. Scape erect. .Summer. (Fig. 98.) 



Flowers purple Nos. 1, 2 



* Flowers yellow (a) 



a Plants rooting in the mud Nos. 3-5 



a Planis floating in the water . . . (b) 



b Plants buoyed by a whorl of inflated petioles No. 6 



b Plants buoyed by air-Madden? on special brauchlets. . . .Nof>. 7, 8 

 b Plants buoyed by air-bladders on the leaves.. ..(c) 



c Flowers of 2 kinds, the li^efs down on the stems. . . .No. 9 



c Flowers all alike and borne on the scapes (d) 



d Flower-stalks 2-12, nodding in fruit, on each scape . . . .Nog. 10, 11 

 d Flower-stalks 1-5, erect in fruit on each scape. . . . Nos. 12-15 



1 U. purpu'rea. Leaves whorled, on the long floating stems. Fls. 6" broad. Ponds. 



2 U. resupina'ta. Leaves scattered on the creeping stems. Flowers 4". Muddy shorca, 



3 TJ. cornn'ta. Scape tall (8-12'), scaly, 2-5-flo\vered. Fls. large, spur de-curved. 



4 U. subula'ta. Scape 2-5' high, very slender, flowers few, small. Spur iuflexed. 



5 TJ. biparti'ta. Scape 2-3', flowers 1-3, on slender pedicels. Low^r lip of the cor 



olla entire. South. 

 i U. infla'ta. Floating stem Ion?. Scape 6-10' high, flowers 4 or 5, 8" broad. 



7 TJ. interme'dia. Leaves crowded, in 2 rows, rigid. Fls. 2 or 3, spur conical 



8 TJ. Robbin'sii. Leaves alternate, thread-like. Fls. 4-7, spur fusiform. 



$ U. clandesti'na. Stem flowers solitary, bud-like. Scape with 2 or 3 fls. seldom seen. 



10 U. vulga'ris. Scape with 5-12 fls. Corolla throat closed. Spur conical. 



11 TJ. minor. Scape with 3-6 fls. Corolla throat open. Spur blunt, very short 



