428 TETRANDRIA MONOGYNIA. Trapa. 



TRAPA. Schreb. gen. N. 203. 

 Calyx four-parted, or four-leaved. Corol four-petalled. 

 Germ inferior, two-celled ; cells from one to two-seeded ; at- 

 tachment of the ovuluin superior. Nut turbinate, armed with 

 two or four horns, (which were the leaflets of the calyx.) 

 Embryo .simple, lodged in the apex of the ample perisperm. 



1. T. bicoinis. 



Nuts with two, opposite, recurved, very obtuse horns. 

 Chin. Lin ko. 



A native of China, where it is carefully cultivated in lakes, 

 ponds and other receptacles of water. 



2. T. bispinosa. R. 



Nut with two opposite, straight, barbed, spinous horns. 

 Nectary cup-shaped, curled. 



Shringata. Asiat. Res. vol. m.p. 253. 



Sans. Sr/ngatw, Julwkwutwko. 



Beng. Panee-phul. Smghara. 



Panover-tsjerana, Rlteed. Hort. Ma\ vol. xi. p. 64. t. 33. 

 (evidently intended for this plant, and not T.natans.) Found 

 floating on sweet, standing water in Bengal and many other 

 parts of India. Flowering time the rainy season. 



Root consisting of numerous, simple, capillary fibres which 

 issue from the under margins of the cicatrices of the fall- 

 en leaves. Stems stoloniferous, often several feet long, float- 

 in^. Leaves petioled, alternate, approximate round the 

 apex of the shoots, of a rhomboidal reniform shape; with the 

 posterior margins entire, and the anterior ones serrate den- 

 tate, smooth above, of a deep green, villous and purple un- 

 derneath ; from three to four inches broad, and nearly as long. 

 Petioles villous, lengthening with the age of the leaves, to- 

 wards the apex much smaller; this part contains many inflat- 

 ed vescicles, which render the whole plant very buoyant. 

 Stipules two pair, the superior ones simple, semi-lanceolate 



