Trapa.] Onagracece. 235 



Moist low country ; very rare. I have only seen Moon's specimens 

 collected at Kalutara. 



Also in India, Malaya, Japan. 



(Enothera fruticosa, L. A form of this common N. American plant 

 has become semi-naturalised by roadsides in the Uva hill-country, having 

 probably originated from Hakgala Garden. Another species, perhaps 

 CE. odorata, is also found in similar localities. 



3. TRAPA, L. 



Aquatic herb ; 1. alt., floating, stipulate ; fl. solitary, 

 axillary ; cal.-tube adnate to lower half of ov., segm. 4, in 

 2 pair, outer pair persistent and becoming spinous in fruit ; 

 pet. 4 ; stam. 4, inserted outside lobes of epigynous disk ; 

 ov. half-inferior, 2-celled, with a solitary pendulous ovule in 

 each cell ; style slender, surrounded at base with a disk of 

 8 rounded lobes, stigma capitate ; fruit large, bony, in- 

 dehiscent, horned, angular, 1 -seeded ; seed large, completely 

 filling fruit, cotyledons extremely unequal, one very large and 

 thick, the other merely a very small scale, radicle superior, no 

 endosperm. — Sp. 2 ; both in Fl. B. hid. 



T. bispinosa, Roxb. Hort. Beng. 11 (181 3). Ikiliya, 5. 



Thw. Enum. 124. C. P. 2932. 



Fl. B. Ind. ii. 590. Roxb. PI. Cor. t. 234. 



An aquatic, stems long, flexuose, ascending in the water, 

 cylindrical, smooth, the more submerged part thickly set with 

 pairs of green pectinate spreading organs (? roots) coming off 

 from immediately below the position of stip. of fallen 1., and 

 i-ii in. long; 1. crowded in upper part of stem, petiole at 

 first short, but growing as the internodes lengthen to 4 in., 

 cylindrical, upper portion roughly hairy, dilated at a short 

 distance below the end into a large fusiform, spongy float, 

 lower portion glabrous, blade floating on surface of water, 

 \\ in. by \\ in. wide, rhomboid-triangular, truncate and entire 

 at base, irregularly incise-serrate above, acute, very glabrous 

 and shining, dark green mottled with brown above, densely 

 pubescent and reddish-purple beneath, stip. linear, mem- 

 branous, caducous ; fl. few, solitary, axillary, on short, stout, 

 hairy ped. ; sep. subacute, pubescent outside ; pet. ovate, 

 delicate; fruit ripening under water, iv. in. wide, turbinate, 

 somewhat compressed, extended above at each end into a 

 spreading, flattened, spinous horn, the top tipped in centre by 

 a short, sharply pointed, conical beak, each side at the base 



