282 ON SEEDLINGS 



Cotyledons like those of I. Roxburgh!! in size and shape, but only 

 trinerved, and sometimes asymmetrical. 



Stem herbaceous, terete, glabrous, shining light green ; 1st 

 internode 1 cm. long, T5 mm. thick ; 2nd 3 cm. long, 1 mm. 

 thick ; next longer and thinner. 



Leaves. No. 1. About 8 cm. long, 3 cm. wide (including 

 the channelled glabrous petiole), cordate or subcordate, acuminate 

 or cuspidate, entire, palmately incurvinerved, glabrous, thin, light 

 green. 



No. 2. Narrower in proportion to its length. 



Ultimate leaves as in I. Eoxburghii, but glabrous. 



Ipomcea dissecta, Willd. (fig. 542). 



Hypocotyl above ground very short, stout, fleshy, glabrous, pale 

 or colourless. 



Cotyledons foliaceous, very large, bifid for more than half their 

 length, very broad transversely,, with broadly oblong, obtuse, divari- 

 cate lobes, cordate at the base, glabrous, deep green, petiolate \ 

 venation consisting of a slender median nerve, bifurcate near its 

 apex, and giving off a strong lateral nerve on each side near the 



FIG. 542. Ipomcea dissecta. Half nat. size. 



base, and a stronger pair at the base of the lamina, and all four 

 with ascending branches which again divide more or less ; larger 

 lamina 1-15 cm. long, 8'9 cm. wide (each lobe 2*7 cm. long) ; 

 smaller lamina I'l cm. long, 3'6 cm. wide (each lobe 2'5 cm. long) ; 

 petioles unequal, semiterete, channelled above, glabrous, purplish, 

 the longer 5 cm. long, the shorter 4'1 cm. long. 



Stem herbaceous, erect, soon twining, terete, glabrous, marked 

 with small distant, papillose elevations, pale purplish ; 1st inter- 



