TRIANDRIA. MOXOGYNIA. 29 



spathulate, 1 or more in the same spatha, axillary In L. 

 gvamineus; in all the others, bursting as it were from the 

 base of the petiole. Flowers extremely evanescent, in 

 all the species white, except the L. graminens, wh»ch ap- 

 pears to be scarcely of the same genus, all the others 

 appertain to Heteranthera, and the L. gramineus is now 

 called ScHOLLERA, being further generically distin- 

 guished by having a capsule of one cell. 



Species. 1. owZ/s, Mich, (spatha 2 or 3-flowered? v. 

 V.) Heteranthera fo';«osa of Beau vo is. 2- re7nfor7ms, Mick, 

 H. acuta of Beauvois This appears to be the same plant 

 with the H. rejiiformis of the Flora Peruviana.f 3. gra- 

 mincus; (now S choller a j^ra?«/«ea.) Found in almost all 

 the rivers of the United States from the Delaware south, 

 and in the Ohio, to the west. 



41. STIPULICIDA. Michaux. 



Calix 5-parted, persistent. Corolla 5-petal- 

 led, petals entire, and as long as the calix. 

 Style short, stigmata 3. Capsule l-celled, 3- 

 vaived. Seeds few, each attached to the recep- 

 tacle by an umbilical filament. 



A small perennial herb, with a leafless, dichotomous, ar- 

 ticulated stem; the base of each branch subtended by 3 

 opposite, lacerated stipula. Flowers minute, terminal, al- 

 most sessile, growing from 3 to 6 together. Radical 

 leaves minute, spathuiate. 



Species, l.setacea. Very nearly allied to the genus PO" 

 lycarpon. 



42. POLYCNEMUM. L. 



Calix 3-leaved. Petals 5 caliciform. Cap- 

 side 1-seeded, membranaceous, not opening, co- 

 vered by the calix. (Stamina 1,2, 3, and 5.) 



Stem herbaceous, branching, diffuse, leaves crowded, 

 linear, subulate, or filiform, and carnose; flowers calicine, 



f The leaf buds of this species are large and involute, including 

 an extraordinary quantity of embryon foliage, enTeloped like 

 the Braceiiia in a gelatinous fluid. It is also extremely local; 

 in Pennsylvania it is scarcely known beyond the vicinity of Fhi^ 

 ladelphia, and is not noticed by Mr. ElUot as existing in tU 

 Southern states. 



