106 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Costa Rica: Cerro de San Isidro near San Ramon, at an altitude of about 1,300 

 meters, A. Brenes, flowers, June 14, 1901 (Institute ffe. geog. Costa Rica no. 14504; 

 U. S. National Herbarium no. 579710, type). 



This specimen comes near G. nigrcscens Schlecht. in the size and some details of the 

 flower and reminds likewise of G. barbatus H. B. K., especially by the peculiar append- 

 ages along the inner right margin of the petals, but by some other important char- 

 acters it is conspicuously distinct from the remaining Central-American species. 



Fig. 14.— Flower parts of Gonolobus pteudobarbatut. a, Calyx lolies; b, corolla lobes; c, translator^ m; 

 (/, gynostegium, from above, a, b, d, Scale 8; c, scale 30. 



Gonolobus dubius Pittier, sp. nov. Figure 15. 



Stems numerous, sublignose, suberect or spreading, hairy. Internodes unequal, 

 mostly long (up to 20 cm.), the plant thus appearing sparsely foliated. 



Petioles slender, 2 to 4 cm. long, minutely pubescent. Leaf blades 4 to 7 cm. long, 

 2 to 5 cm. broad, ovate-acuminate, cordate at base, with the rounded auricles very 

 open at earlier stages and close later; upper face dark green, subglabrous; lower face 

 sparsely hairy, pale or brownish, with salient, minutely hirsute venation; two small 

 glands at the insertion of the blade upon the petiole. 



Inflorescences axillary, of few (1 to 4) flowers. Peduncles and pedicels minutely 

 pubescent, the former 1 to 2 cm. long, the latter 3 to 4 cm. long and very slender. 

 Calyx lobes lanceolate-acuminate, 10 to I L mm. long, 2.5 mm. broad, minutely pubes- 

 cent outside, smooth inside, sparsely ciliate on the margin, a minute, pointed, yellow 

 gland at each intervening sinus. Corolla 3 to 4 cm. in diameter, stellate-pubescent 



