66 New Species of South American Plants 



and sparsely puberulent. Stems elongated, brown, angled or 

 costate. Stipules lo to 13 mm. long, ovate, scarious, brown, 

 nerved, the deep-brown midrib terminating in a seta, the mar- 

 gin lacerate-ciliate, the hairs extending down upon the stem- 

 joint. Petioles 6 mm. long, slender, the blades 7 to 10 cm. long, 

 1.5 to 2.5 cm. broad, lanceolate • with obliquely rounded base 

 and regularly acuminate and acute summit, the margin and 

 surfaces as above described, extremely thin, sub-5-nerved by 

 the two basal pairs of secondaries which are erect and run about 

 two-thirds of the way to the summit. Pedicels filiform, those 

 of the staminate flowers extremely slender. 



Staminate Flowers. — Sepals 2, 1.5 cm. long, nearly i cm. 

 broad, ovate, blunt, slightly cordate. Stamens 12, about 4 

 mm. long, the filaments filiform, about half as long as the 

 anthers, which are lanceolate and minutely mucronate. Petals 

 wanting. 



Pistillate Flowers. — Pedicels stouter than those of the 

 staminate flowers. Ovary obovoid, 14 mm. long, 9 mm. broad, 

 one wing more than 2 cm. long and 14 mm. wide, obliquely 

 ovate, obtuse, ascending to about the level of the summit of 

 the petals, the other wing about half as large. Petals oblong, 

 14 mm. long. Styles 3, distinct, pubescent, trifid two-thirds of 

 the way to the base, the branches clavate, about a third the 

 length of the petals. 



Antahuacana, Espirito Santo, near Cochabamba, Bolivia, 

 750 m., June 1909 (Buchtien, No. 2283). 



Begonia heterodonta. 



Sparsely pilose on both leaf-surfaces and the young branch- 

 lets with scattered stout tapering white hairs. Stsms thickish 

 but weak, nerved, pale-brown, leafy above. Stipules i cm. 

 long, 3 or 4 mm. broad, lanceolate with attenuate .summit, pale- 

 brown, scarious, not early deciduous. Petioles 3 or 4 mm. long. 

 Midrib of the blades 5 to 10 cm. long, the blade highly inequi- 

 lateral, the larger side 2 to 4 cm. broad, its rounded base descend- 

 ing one or two cm. lower than the summit of the petiole, sup- 

 ported by four ribs which rise together with the midrib from the 

 summit of the petiole; smaller side i to 2 cm. broad, its margin 

 ascending from the summit of the petiole at an angle of about 

 65 degrees, supported by one or two nerves which rise from the 

 midrib near its base; blade acuminate and acute, very thin, 

 pale beneath, the margin very coarsely and unequally dentate, 

 the large teeth serrate, with very unequal attenuate teeth, their 

 points sub-setose. Flowers few, in a slenderly peduncled, loose 

 and open terminal cyme, on filiform pedicels. 



Staminate flower. — Perigone segments 2, ovate, twice as 

 long as the stamens, which are (always ?) 5 in number, the fila- 

 ments united at the base, little longer than the nearly rotund 

 anthers. 



