﻿An Enumeration of the Plants Collected by Dr. H. H. Rusby in 



South America, 1895-1896 —XXV. 



By H. H. Rusby. 



(Continued from Bull. Torr. Bot. Club, 25: 500. 10 S. 1898. ) 



Stigmatic disk circular, slightly convex, the center sharply de- 

 pressed : fruit unknown. 



A glabrous twining shrub, the habit that of Blcpharodon, the 

 small (yellowish ?) flowers loosely umbelled in one or both axils, 

 the umbels short -peduncled. 



The genus is dedicated to Miss Anna Murray Vail, to whom 

 we are indebted for much valuable information concerning the 

 lations of American Asclepiadaceae. 



re- 



Vailia mucronata. 



Branches elongated, slender, terete, green, the internodes 3-5 

 cm. long : petioles about 1 cm. long : blades 4-6 cm. long, 1-2 

 cm. broad (on the older branches twice this size), lance-oblong, 

 the base blunt to rounded, the apex acute and strongly and stiffly 

 mucronate, dark-green above, pale underneath, the midrib very 

 broad, reddish, like the (about) 20 pairs of secondaries : peduncles 

 mostly shorter than the petioles, about 5-7-flowered, the pedicels 

 nearly twice the length of the peduncles, stoutish : calyx 3.5 mm, 

 broad, divided more than half way, the segments broadly ovate : 

 corolla nearly 1 cm. broad when fully expanded, divided two-thirds 

 of the way, the segments ovate, glabrous : outer ligule erect, a little 

 shorter than the stamen-column, ovate, obtuse : inner ligule erect, 

 ovate, obtuse, twice as broad as the outer, about as long as the 

 stamen-column, its upper half free. 



Bolivia. (Nos. 1275 and 2547.) The same as Bang's no. 2058. 



LOGANIACEAE. 



Spigelia elongata Britton sp. nov. 

 Rhizome short, suberect, stout, woody : roots 'stout, with nu- 

 merous elongated, widely spreading branches : stem erect, .5-1 m. 

 high loosely branched above, terete or bluntly and irregularly 

 angled above, stngose, grayish-green, the internodes mostly" about 

 6 or 8 cm. long : lower leaves sometimes ternately whorled only 



(542) 



