28 Rusby: An Enumeration of South American Plants 



Diastemma purpurascens sp. nov. 





Sparsely to very sparsely coarse-pilose throughout : stems 4-7 

 cm. high, tufted, erect, sub-simple, but appearing as though 

 branched by the widely spreading pedicels : petioles 4—6 mm. long, 

 broad, weak : leaves deep purple, 1.5-4 cm. long, 1-2 cm. broad, 

 ovate, abruptly short-produced at the base, blunt at the apex, 

 coarsely sinuate at the margin, thin, the midrib and about 4 pairs 

 of secondaries very prominent underneath : pedicels 1—2 cm. long, 

 thickened upward, weak : calyx-tube turbinate, in flower 3 mm. 

 long by 2 mm. broad, the lobes about equal, rotund ovate, nar- 

 rowed at the base, spreading orreflexed, herbaceous, both the tube 

 and the lobes greatly enlarging in fruit: corolla nearly 1 cm. long, 

 the tube campanulate, strongly declined or deflexed at the base, 

 the mouth oblique, 7 or 8 mm. broad. 



Unduavi, 8000 ft., Oct., 1885 (no. 2604), and Yungas, 4000 

 ft., 1885 (no. 1984). 



Isoloma Sprucci Britton, Mem. Torr. Club, 6 : 97. Mapiri, 

 5000 ft., Apr., 1886 (no. 21 51). The same as Bang's no. 1 541 

 and Spruce's no. 5841. 



Isoloma flexuosa sp. nov. 



Ferruginous-tomentose, the upper leaf-surfaces coarsely short - 

 strigose : stems ascending, very weak and flexuous, obtusely 

 angled : petioles 1—3 cm. long, weak, broad : blades 4-8 cm. long, 

 2—5 cm. broad, ovate, rounded at the base, acute at the apex, 

 crenate, thin, pale, the venation coarse, strongly prominent under- 

 neath, the secondaries about 10 pairs, strongly incurved, the ter- 

 tiaries meeting about midway between them : pedicel 2 or 3 cm. 

 long, weak, shaggy : calyx-tube 5 mm. broad, sub-hemispherical, 

 the lobes nearly 1 cm. long, foliaceous, ovate, with contracted 

 base, acute : corolla red, strongly declined, very oblique at the base, 

 less so at the mouth, 1.75 cm. long, 1 cm. broad, as pressed, cam- 

 panulate, with highly contracted mouth, the short lobes unequal, 

 erect-spreading : anthers all coherent, the quadrilateral mass about 

 3.5 mm., square: style nearly 1.5 cm. long, thickish, pilose, the 

 stigma slightly dilated, blunt : disk nearly as long as the ovary, of 

 five separate, thick, fleshy glands, two of them larger and 2-lobed. 



(no. 2424) 



Isoloma 



Coarsely pilose, the older portions sparsely, the younger densely, 

 or somewhat tomentose : stems thick, but weak, decumbent or 

 ascending, pale, coarsely angled : petioles 3-5 cm. long, broad 



