118 Proceedings of the Biological Society of Washington. 



collected was found by Mr. Popenoe growing in volcanic loam in a 

 dooryard at Finca Capetillo. 



Jatropha sympetala Standi. & Blake, sp. nov. 



"Tree with milky sap;" branch stout, subquadrangular, grayish-fuscous, 

 glabrate ; young branchlet green, angulate, sparsely ascending-hispidulous ; 

 leaves alternate, crowded at base of young branchlet, the blades obovate, 

 7 to 9 cm. long, 3.5 to 5 cm. wide, strictly entire, obtusely apiculate or 

 emarginulate at the broadly rounded apex, cuneate-narrowed at base, 

 thin, feather-veined with 6 or 7 pairs of scarcely prominulous lateral 

 veins and obscure translucent anastomosing secondaries, punctate, above 

 light green, glabrous, beneath glaucescent and very densely papillose over 

 whole surface; petioles slender, unmargined, 1 to 1.5 cm. long; staminate 

 panicles shorter than leaves, several at base of young growth, densely 

 papillose-hispidulous, the peduncles 3 to 4.5 cm. long, many times di- 

 chotomously divided toward apex, the flowers crowded on the ultimate 

 branchlets; pedicels 2 to 3 mm. long; calyx 5-parted nearly to base, 1.2 

 mm. long, the segments oval, broadly rounded, ciliate and dorsally pubes- 

 cent; corolla "red," ellipsoid-ovoid, obtuse, 8 mm. long, the 5 lobes oval, 

 rounded, only 1.5 mm. long, densely cinereous-puberulous outside, the 

 tube glabrous; discal glands 5, free, ovoid, dark-colored, 1 mm. long, with 

 narrowed somewhat spreading apex; stamens 10, in two whorls of 5, 

 the 5 shorter with filaments united nearly half their length, the 5 longer 

 6 mm. long, their filaments united about 2 /s their length; pistillate flowers 

 and fruit unknown. 



Type in the U. S. National Herbarium, no. 988581, collected at Playa 

 de Coyula, Oaxaca, Mexico, June 13, 1919, by B. P. Reko (no. 350). 



Jatropha sympetala belongs to the subsection Canescentes of the section 

 Mozinna as the genus is divided in Pax's monograph, and is easily dis- 

 tinguished from any species of that section by its obovate not cordate 

 leaves. Its vernacular name is given as "pifioncillo." 



Guarea obtusata Blake, sp. nov. 



Tree; branchlet with light-colored pustulate-lenticellate bark, strigose 

 and strigillose ; leaves abruptly pinnate, the leaflets 2 to 4 pairs ; petiole 

 subterete, hispidulous-strigillose, glabrescent, 3.5 to 4 cm. long; rachis 

 similar, grooved above, 5 to 15 cm. long; leaflets opposite, on petiolules 4 

 mm. long, the upper elliptic-oblong or somewhat obovate-oblong, 14 to 

 17 cm. long, 4.5 to 7 cm. wide, broadly rounded at apex, cuneate and in- 

 equilateral at base, pergamentaceous, entire, equally green both sides, 

 glabrous above, beneath sordid-barbate in the axils of the 6 to 8 pairs of 

 prominent veins, otherwise glabrous, the secondaries and tertiaries promin- 

 ulous-reticulate; lower leaflets similar but somewhat smaller, about 9 to 

 11 cm. long; panicles axillary on the wood of the year, 3 to 4.5 cm. long, 

 bifid from the base, hispidulous-strigillose, rather dense; cymules mostly 

 3-flowered; pedicels stout, 3 to 5 mm. long, essentially glabrous; flowers 

 "white with pink tinge, very fragrant;" calyx saucer-shaped, about 1.5 



