BLADDERWOUT FAMILY. 225 



6. AN AGALLIS, PIMPERNEL. (Old Greek name, meaning delightful.) 

 Low herbs of the Old World, flowering all summer. 



A. arvensis, COMMON P. or POOR-MAN'S WEATHER-GLASS, the small 

 (red, purple, or white) flowers said to close at the approach of rain ; in gardens 

 and running wild in sandy fields ; spreading on the ground, with pale ovate 

 leaves shorter than the peduncles, and rounded petals fringed with minute 

 glandular teeth. 



A. CSerulea, BLUE P., of the gardens, a tender mostly larger form of the 

 preceding, with larger blue flowers. (T) 



7. SAMOLUS, WATER-PIMPERNEL, BROOKWEED. (Old name, 

 of unknown meaning.) Fl. late summer. 2/ 



S. Valerandi, var. Americanus. Along rills and wet places ; spread- 

 ing, 6' 10' high, with obovate leaves, and very small flowers on slender pedi- 

 cels, which bear a bractlet at the middle, but no bract at base. 



8. HOTTONIA, WATER VIOLET or FEATHERFOIL. (Named 

 for a Prof. Hotton of Holland.) Fl. summer. 2/ 



H. inflata. A singular plant in pools and ditches, smooth, with stems and 

 branches much inflated except at the joints, bearing finely cut pectinate leaves ; 

 flowers white. 



72. LENTIBULACE^I, BLADDERWORT FAMILY. 



Aquatic or marsh herbs, with the ovary and pod as in Primrose 

 Family, but with irregular bilabiate flowers bearing a spur or sac 

 underneath, and only 2 stamens: represented by the two follow- 

 ing genera. 



1. UTRICULARIA. Calyx parted into 2 nearly entire lips. Corolla deeply 2- 



lipped, the lower lip bearing above a prominent palate closing the throat, and 

 below a large spur. Anthers 2, converging in the throat of corolla. Stigma 

 2-lipped. Leaves finely cut, mostly into threads or fibres, many bearing 

 little air-bladders; some are leafless. 



2. PINGUICULA. Upper lip of calyx S -cleft, lower 2-cleft. Lips of corolla 



distinctly lobed, the hairy or spotted palate smaller, so that the throat is 

 open. Otherwise as in Urricularia. Leaves all in a tuft at base of the 

 1-flowered scapes, broad and entire, soft and tender. 



1. UTRICULARIA, BLADDERWORT. (Utriculus, a little bladder.) 



Fl. all summer. The following are the commonest species. 



* Floating, branching, bladder-bearing : corolla violet-purple. 



U. purpurea. Only E. & S., with 2-4 flowers on the peduncle, and a 

 rather short spur appressed to the 3-lobed lower lip of corolla. 



* * Floating, branching, bladder-bearing : corolla yellow. 



U. inflata. Only E. & S.: swimming free, the petioles of the whorl of 

 leaves around base of the 5-10-flowcred scape inflated into oblong bladders, 

 besides little bladders on the thread-like divisions of the leaves. 



U. vulgaris, LARGE B. Common in still or slow water ; the stems 

 long and very bladder-bearing on the thread-like many-parted leaves; flowers 

 5- 10 in raceme, large, with spur rather shorter than lower lip. 



U. intermedia. Chiefly N. in shallow water, with stems 

 bearing rather rigid leaves with linear-awl-shaped divisions, and no bladd 

 these being on separate leafless branches, the slender raceme few-flowered ; 

 spur nearly equalling the very broad lo\ver lip. 



U. gibba. Chiefly Middle States : small, with short branches bearing 

 sparse thread-like leaves and some bladders, 1 - 2-flowercd peduncles only 1 

 high, and blunt conical spur shorter than lower lip. 

 15 



