LENTIBULACE^E. (BLADDERWORT FAMILY.) 275 



11. HOTTC^NIA, L. FEATHERFOIL. WATER ViOLBr. 



Calyx 5-parted, the divisions linear. Corolla salver-shaped, with a short 

 tube ; the limb 5-parted. Stamens 5, included. Pod many-seeded, 5 valveff ; 

 the valves cohering at the base and summit. Seeds attache! by their base, 

 anatropous. Aquatic perennials, with the immersed leaves pectinate, and the 

 erect hollow flower-stems almost leafless. Flowers white or whitish, whorled at 

 the joints, forming a sort of interrupted raceme. (Named for Prof. Notion, a 

 botanist of Leyden, in the 17th century.) 



1. H. inflata, Ell. Leaves dissected into thread-like divisions, scattered 

 on the floating and rooting stems, and crowded at the base of the cluster of pe- 

 duncles, which are strongly inflated between the joints ; pedicels, corolla, an- 

 thers, and style short. Pools and ditches, New England to Kentucky, and 

 southward. June. The singularly inflated peduncles are often as thick as 

 one's- finger. 



ORDER 71. LENTIBULACE^E. (BLADDERWORT FAMILY.) 



Small herbs (growing in water or wet places'), with a 2-lipped calyx, and a 

 2-lipped personate corolla, 2 stamens with (confluently) one-celled anthers, 

 and a one-celled ovary with a free central placenta, bearing several anatro- 

 pous seeds, with a thick straight embryo, and no albumen. Corolla deeply 

 2-lipped, spurred at the base in front ; the palate usually bearded. Ovary 

 free : style very short or none : stigma 1 - 2-lipped, the lower lip larger 

 and revolute over the approximate anthers. Pod often bursting irregular- 

 ly. Scapes 1 - few-flowered. A small family, consisting mostly of the 

 two following genera : 



1. UTRICUL.ARIA, L. BLADDERWORT. 



Lips of the 2-parted calyx entire, or nearly so. Corolla personate, the palate 

 on the lower lip projecting, and often closing the throat. Aquatic and im- 

 mersed, with capillary dissected leaves bearing little Jbladders, which are filled 

 with air and float the plant at the time of flowering ; or rooting in the mud, and 

 sometimes with few or no leaves or bladders. Scapes 1 - few-flowered. (Name 

 from utricidus, a little bladder.) 



# Upper leaves in a whorl on the otherwise naked scape, floating by means of large 

 bladders formed of the inflated petioles ; the lower dissected and capillary, bearing 

 little bladders : rootlets few or none. 



1. U. inflata, "Walt. (INFLATED BLADDERWORT.) Swimming free ; 

 bladder-like petioles oblong, pointed at the ends, and branched near the apex, 

 bearing fine thread-like divisions; flowers 5-10 (large, yellow); the appressed 

 spur half the length of the corolla; style distinct. Ponds, Maine to Virginia, 

 and southward, near the coast. Aug. 



* * Scapes naked (except some small scaly bracts), from immersed Imnching sterns^ 

 whicJi commonly swim free, and bear capillary dissected kaies furnished with smalt 



