SCROPIIULARINE^E 



315 



a leaf of the first whorl is carried up on the internode above it, and 

 occasionally a leaf of the second whorl may be below the level of 

 the others. 



Above this the most frequent number of leaves in a whorl seems 

 to be four ; but it varies from three to five, and occasionally the 

 whorls are broken or interrupted. 



Ultimate leaves four to five in a whorl, lanceolate-linear, sub- 

 acute, deep opaque or glaucous-green, with a shallow channel above, 

 paler beneath with a prominent midrib and two faint lateral nerves 

 near to and parallel with the margin, and indistinct, alternate, 

 ascending nerves passing from the midrib to the submarginal nerves. 



FIG. 556. Uliodoclnton volubile. Nat. size. 



Rhodochiton volubile, Zucc. (fig. 556). 



Hypocotyl subterranean or short. 



Cotyledons petiolate, coarsely and thinly hairy ; lamina rotund- 

 ovate, apiculate, 6 mm. long, 5 mm. wide ; petiole channelled above, 

 tapering downwards, 3 mm. long. 



Stem erect, terete, thick and succulent at the base, and becoming 

 much more slender upwards as it commences to twine, villous, 

 purplish ; 1st internode 7 mm. long ; 2nd 5'5 mm. ; 3rd 9'5 mm. ; 

 4th 9-5-10 mm. ; 5th 1-6 cm. 



Leaves simple, cauline, opposite, decussate, exstipulate, petiolate, 



