ARISTOLOCHIACE^E 



445 



nerved upwards with alternate branching nerves. The 

 lamina hangs perpendicularly from the apex of its horizontal 

 petiole. The whole seedling of Aristolochia elegans (fig. 624) 

 is smaller. The cotyledons are broadly oval, obtuse, emar- 

 ginate, suddenly narrowed into the petiole, trinerved through- 

 out their length and reticulate. The first pair of leaves are 

 smaller than the cotyledons, for which they might be mis- 

 taken as they are nearly on the same level, suborbicular and 

 emarginate, but they are trinerved at the base only with alter- 

 nate nerves upwards. The following three leaves are broadly 

 reniform and trinerved with copiously branching nerves. 



Aristolochia caudata, L. 



Hoot short, oblique, slightly branching. 



Hypocotyl about G cm. long, 2 mm. thick, terete, glabrous, 

 herbaceous, green. 



Cotyledons with shallow channelled, glabrous, horizontal petioles 

 and vertically reclinate or pendent blade 2'5 cm. long, 2 cm. wide, 

 oblong, rounded, entire, penninerved, glabrous, thin, deep glaucous- 

 green above, paler beneatb. 



Stem. 1st internode 2 mm. long and as thick ; 2nd twice as long, 

 but thinner than the first, terete, slightly pubescent, green. 



Leaves simple, cordate at tbe base, otherwise entire, cauline, 

 alternate (the first two opposite), exstipulate, petiolate, glabrous, 

 glaucous-green above, paler beneath ; petiole somewhat pubescent. 



Nos. 1 and 2. Opposite, long petioled, re- 

 clinate, witb a blade 3 cm. long, 2'5 cm. 

 wide, subcordate, acute, subpalmatinerved, re- 

 ticulate, entire, quite glabrous, deep glaucous- 

 green above ; petiole 3 cm. long, T5 mm. 

 wide, slightly pubescent. 



Nos. 3, 4, &c. Alternate, broadly cor- 

 date through the appearance of a small vein- 

 let and accompanying parenchyma at the 

 base of the lowest vein of each of the two 

 basal primary nerves. 



Aristolochia elegans, Masters (fig. 624). 



Ilypocotyl erect, terete, slender, glabrous, 

 8-10 mm. above the soil. 



Cotyledons broadly oval, obtuse, minutely emarginate, suddenly 

 tapering into the petiole, foliaceous, membranous, glabrous, trinerved 



FIG. 624. 



Aristolochia elegans. 

 Nat. size. 



