486 PROCEEDINGS OF THE AMERICAN ACADEMY. 



9 to 12 dm. high. The closely and iiicisely toothed leaves, the rather 

 small blue flowers, a little over 13 mm. in length, render this species 

 readily recognizable. 



SoLANUM MARGINATUM, L. f. Suppl. 147. Complete specimens 

 agreeing in every detail with this interesting Old World species were 

 collected by Mr. C. G. Pringle in the Valley of Mexico, 23 August, 

 1896, no. 7336, and at Coutreras, Valley of Mexico, altitude 2400 m., 

 14 August, 1897, no. 6667; also by Professor A. Duges, in "Ravin 

 (cafiada) de Esperanza a 6 km. de Guanajuato" in the summer of 1897. 

 The species is well illustrated in Jacq. Ic. Ear. t. 45. 



Datura pruinosa. Herbaceous : stems, at least above, covered 

 with a fine short close pubescence : leaves ovate or ovate-oblong, 3 to 

 8 cm. long, one half to two thirds as broad, repand-dentate, acute or ob- 

 tusish at the apex, unequal at the base, puberulent on the upper surface, 

 pruinose-pubescent beneath : petioles 1 to 4 cm. long, pubescent: flowers 

 erect, pedicellate : pedicels during anthesis 4 to 8 mm. long, later be- 

 coming slightly elongated and reflexed : calyx tubular, 5-lobed, 3 to 

 4 cm. long, densely pubescent especially toward the base ; lobes ovate- 

 lanceolate, acute, somewhat unequal : corolla white, 5 to 6 cm. long, 

 glabrous or nearly so ; lobes tipped with a slender acumiuation : stamens 

 included ; filaments glabrous, adnate to the corolla-tube for one half its 

 length : capsule pendulent on the reflexed pedicels, subglobose or slightly 

 ovate-oblong, about 3 cm. long, armed with sliort slender prickles, these 

 as well as the surface of the capsule finely pubescent : seeds oblique, 

 light brown, pitted. — Collected by Rev. Lucius C. Smith, Cuicatlaii, 

 Oaxaca, altitude 550 m., 16 October, 1894, and 7 October, 1895, no. 943 ; 

 also by C. G. Pringle, Valley of Oaxaca, altitude 1540 m., 8 July, 1897, 

 no. 6732. A species readily recognized by the small flowers, and the 

 fine close pruinose pubescence of the young leaves and the tips of the 

 young branches. Most nearly related to D. Metel, L. 



Distictis laxiflora. Pithecoctenium laxljioriim, DC. Prodr. ix. 

 195. Having at hand numerous and perfect specimens of the above 

 species, it is evident, from the fruiting characters, that its affinity is 

 with the genus Distictis rather than Pithecoctenium. To DeCandolle's 

 excellent description, drawn, however, from a flowering specimen only, 

 may be appended the following : — climbing : flowers, even in the same 

 specimen, from 4 to nearly 10 cm. long, purple or violet: capsules ovate- 

 oblong or lance-oblong, narrowed at either end, in the dried state 7 to 

 9 cm. long, about 4 cm. broad, often slightly curved, smooth, glabrate, 

 longitudinally ridged along the midrib and margins of the valves, mar- 



