New Species of South American Plants 91 



nate. Corolla about 2 cm. broad, the lobes obovate, the crown 

 conspicuous, 2 mm. long. Lobes of the disk ovate, obtuse, 

 slightly exceeding the ovoid ovary. Anther 7 mm. long, nar- 

 rowly acuminate and very acute. 



"Twining to 10 or 12 feet. Occasional in damp somewhat 

 open places in forest and in clearings near streams, 4,500 to 

 6,000 feet, flowering December to May. Collected at Las 

 Nubes, 4,500 feet, December 18." (Herbert H. Smith, No. 

 1656.) 



Prestonia robusta. 



Glabrous except for a minute puberulence on the pedicels. 

 Stems rather stout, sulcate when dried. Petioles nearly 1.5 

 cm. long, broad, the blades 8 to 16 cm. long, 6 to 12 cm. broad, 

 nearly elliptical, the base slightly produced, very thick, the 

 very slender venation inconspicuous, the principal veins mostly 

 slenderly grooved, the principal secondaries about 8 or 9 on each 

 side, almost divaricate, straight and branching at an acute 

 angle, the finer, crooked venation more or less parallel with the 

 secondaries. Peduncle very stout, more than twice the length 

 of the petiole, several-flowered, the pedicels very short and 

 stout. Calyx about 15 mm. long, very thick and coriaceous, 

 the lobes ovate and acuminate. Corolla (but one imperfect 

 seen) with a tube about as long as the calyx and the limb ap- 

 parently about 1.75 or 2 cm. broad. Follicles of the pair un- 

 equal, the longer 16 cm. long, about i cm. broad, nearly straight, 

 slightly narrowed upward, slightly thickened at the end, strongly 

 striate; apparently immature. 



"Tumapasa, 1800 feet, December 15, 1901, the flowers 

 greenish." (R. S. Williams, Bolivia, No. 571.) 



Prestonia gracilis. 



Pubescent throughout, the stsms very slender, sulcate. 

 Petioles 6 to 8 mm. long, very slender, channeled above, the 

 blades 6 to 8 cm. long, 2 to 3.5 cm. broad, lanceolate with 

 rounded base and short-acuminate and acute summit, tnin, 

 the slender and sparse venation inconspicuous, crooked and 

 loosely reticulate. Cymes corymbose, the peduncle i or 2 cm. 

 long, slender, the very slender pedicels nearly as long as the 

 flowers, and the longest bracts nearly as long as the pedicels, 

 lanceolate, attenuate, striate. Calyx 15 mm. long, parted to 

 the base, the divisions ovate, acuminate and acute, thin, hyal- 

 ine, finely nerved. Disk 3 mm. long, almost equaling the ovoid 

 oljtuse ovary, the margin sinuately lobed. Scales of the calyx 

 a third the length of the disk, broad and obtuse. Corolla-tube 

 nearly twice the length of the calyx, the limb 1.5 cm. broad. 

 Crown annulate, short, thick, the ligules linear, obtuse, thick- 



