New Species of South American Plants 99 



"Twining to 5 or 6 feet, the flowers white. Common in a 

 damp clearing, Sierra del Libano, 6,000 feet, January to April. 

 Collected January 23." (Herbert H. Smith, Colombia, No. 

 1679.) 



Vincetoxicum (Qynoctonum) acutissimum. 



Glabrous. Stems slender, terete. Petioles i to 2 cm. long, 

 slender. Blades 5 to 10 cm. long, 2 to 3.5 cm. broad, ovate 

 with rounded base and somewhat abruptly acuminate and acute 

 summit, thin, bright-green, pale beneath,' the venation obscure, 

 very coarsely reticulate. Flowers in two's, the peduncle ex- 

 tremely short, the pedicel about 3 mm. long, stout. Calyx 

 parted nearly to the base, the lobes 6 mm. long, lance-linear, 

 acutish. Corolla 2.5 cm. broad, lobed two-thirds of the way, 

 rotate, the lobes oval or sub-rotund, purplish, with handsome 

 dark veins. Crown coarsely pilose externally, saucer-shaped, 

 7 mm. broad, membranaceous, the margin sinuate and denti- 

 culate. Corpuscle ovoid, acuminate and acute, the filament 

 thick, the pollinia ovoid, large, pendulous. 



"A vine, near Las Partidas, in the edge of the forest, about 

 3,500 feet, March 10." (Herbert H. Smith, Colombia, No. 

 1646.) 



Marsdenia ecorpuscula. 



Yellowish-gray-tomentellate throughout. Branches slender, 

 terete, twining. Petioles 2.5 to 4 cm. long, broadly and shallowly 

 channelled, striate. Blades 5 to 10 cm. long, and almost equally 

 broad, ovate, strongly cordate, the sinus broad, open and. 

 rounded, the lobes rounded, the summit abruptly short-pointed, 

 the point broad, acutish, the venation not prominent, broad 

 and weak, purplish, the principal secondaries 4 or 5 on a side, 

 one pair from the summit of the petiole, all much-branched, 

 the branches interarching near the margin, the remaining vena- 

 tion loosely reticulate. Peduncles 1.5 cm. long, stout, the 

 pedicels much shorter, stout, lanceolate-bracted at the base, 

 the bracts foliaceous. Calyx campanulate, parted nearly to 

 the base, lo-glandular within, the lobes 5 mm. long, lance- 

 linear, obtuse, erect. Corolla-tube cylindraceous, stout, a half 

 or more longer than the calyx, tomentose like the lobes, annu- 

 late at the mouth, the lobes spreading or recurved, fleshy, short, 

 broad, and rounded. Crown of 5 thick, fleshy, purple scales 

 more than half the length of the stamen-tube, each bearing a 

 linear, oblong, short appendage at the summit. Anthers with 

 hyaline inflexed rather large appendages. Stigrna rounded, a 

 little exceeding the anthers. Pollinia large, ovoid, free, there 

 being no corpuscle or filaments. 



"Leaves variable in shape on the same plant, often not 

 cordate, the flowers crimson or crimson-brown, of variable 



