LEGUMINOS^E 



447 



opposite leaves interpetiolar and connate into a subulate acute, 

 entire or bifid piece). 



Nos. 1 and 2. Opposite, unifoliolate ; leaflets subtriangular, 

 obtuse, strongly five-nerved and reticulate, with a large wide open 

 sinus at the base ; nerves ascending and incurved, the basal ones 

 branching into the auricles. 



No. 2. Alternate, pinnately trifoliolate ; leaflets stipellate. 



FIG. 290. Phaseolus vulgaris, var. Half nat. size. 



Vigna lutea, A. Gray. 



Hypocotyl none. 



Cotyledons subterranean. 



Stem erect, terete below, then angled from the leaf-base down- 

 ward with three decurrent nerves, pale green, frequently suffused 

 with purple ; 1st internode 5'5 cm. long ; 2nd 4 mm. 



Leaves cauline, compound, alternate (Nos. 1 and 2 simple and 

 opposite), stipulate, petiolate, glabrous or with a few scattered ad- 

 pressed hairs underneath when young, pale green and shining. 



Nos. 1 and 2. Ovate, acute, entire, subcordate and trinerved 

 at the base, reticulate ; petiole flattened and pubescent above, 



