COX VOL VUL AGILE 281 



one fork entering each lobe, superposed face to face, and then 

 doubled longitudinally, the midrib and radicle following the curved 

 back of the seed and the lateral margins of the cotyledons turned 

 towards the inner angle, at first merely convex on the back and 

 concave on the inner side, but ultimately becoming much crumpled 

 transversely ; radicle lying in a grooved process attached close to 

 the micropyle on the dorsal aspect. 



The sinus of the cotyledons seems to facilitate their doubling 

 upon each other longitudinally, or may even be the effect of that 

 act and the intrusion of the tegmen, for the lobes become longer 

 and more developed as the seed progresses to maturity ; the whole 

 embryo which is very large conforms to the shape of the seed which 

 with its fellow shares equally one cell of the ovary, while the six 

 seeds fill the globose capsule. 



Seedling. 



Primary root nearly vertical, a short taproot, with long, colour- 

 less, branched fibres. 



Hypocotyl herbaceous, 6-8 cm. long, 2-2-5 mm. thick, terete, 

 glabrous, seldom slightly pubescent, bright green. 



Cotyledons seven-nerved at the base, 3'5-4'5 cm. long, 3'5-4 

 cm. wide, pubescent otherwise like those of I. hispida. 



Stem herbaceous, suberect, terete, pubescent, the rather long 

 hairs pointing downward ; first few internodes about 1"5 cm. long, 

 1/5 mm. thick. 



Leaves. No. 1. Long-petioled, 5-6 cm. long, 3-4 cm. wide, 

 cordate, acuminate, entire, radiately incurvinerved at the base, 

 and alternately along the midrib, pubescent all over, thin, bright 

 green above, paler beneath. 



No. 2. Similar, but the apex cuspidate with one small lateral 

 lobe. 



No. 3. Similar, but slightly trilobed. 



Ultimate leaves simple, cauline, alternate, exstipulate, petio- 

 late, radiately incurvinerved at the base, and alternately upwards, 

 reticulate, pubescent all over, membranous, bright green above, 

 paler beneath ; petioles rather slender, semiterete, channelled above, 

 pubescent or hairy. 



Ipomoea Nil, Roth. 



Hypocotyl suberect, herbaceous, 6-9 cm. long, 1-5-2 mm. thick, 

 terete and reddish near base, ridged and pale green higher up, 

 glabrous. 



