78 Class V. Order I. 



tube short, border five cleft, spreading and at length revolute. 

 elothfed on the upper part with a coating of dense, fleshy, obtuse 

 fibres. The colour in the Amer. variety is generally white, 

 with a tinge of red, particularly on the outside. Stamens five, 

 shorter than the corolla, and alternate with its segments ; an- 

 thers, oblong arrow-shaped. Germ ovate ; style cylindrical, per- 

 sistent, as long as the corolla ; stigma bifid, compressed. Cap- 

 sule ovate, two valved, one celled. Seeds numerous, minute, at- 

 tached to two lateral receptacles. Margins of ponds and brooks, 

 Cambridge. May. Perennial. 



81. VILLARSIA. 



VILLABSIA LACUNOSA. Vtnt. Common Villarsio,. 



Leaves heart shaped, angular behind, entire, pitted 



beneath ; umbels on the, petioles ; corollas glabrous. 



Syn. VILLARSIA AQUATIC A. Ginel. 



MENTANTHES TRACHTSPERMA. Mich. 



An aquatic with small floating leaves. The petioles are very 

 slender and flexible. Leaves one or two inches in diameter, 

 heart shaped, the lobes somewhat angular, like those of Nym- 

 phsea odorata ; entire, smooth, dotted underneath. Flowers 

 small, white in umbels growing on the side of the petiole, about 

 half an inch below the leaf. The umbel is generally immersed 

 in the water, but one or more flowers rise above the surface, 

 and expand each day. Calyx in five lanceolate acute segments. 

 Corolla five parted, emarginate and curled upon the margin. 

 Anthers inserted at the divisions of the corolla, separated by 

 small glandular bodies upon pedicels, which appear like stamens 

 and may occasion a mistake in the class. Germ oval. Style 

 short, erect. At the place of the umbel is frequently a knot of 

 solid, oblong, acute bodies, resembling stern bulbs, and tending 

 downward. Fresh pond. July. 



This species appears somewhat different from V. cordata and 

 V. trachysperma of Elliott. 



82. CONVOLVULUS. 



CONVOLVULUS SEPIUM. L. Large Bindweed. 



Leaves arrow shaped with the posterior lobes trun- 



