386 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Specimens examined: 



Oaxaca: Valley of Oaxaca, alt. 1,560 to 2,040 meters, October 2, 1894, Nelson 

 1515; Oaxaca Valley, alt. 1,500 meters, November 7, 1894, C. L. Smith 790; 

 Tlacolula et San Dionicio, August 4, Andrkux 128; Etla, September 19, 

 1895, L. C. Smith 798. 

 Mexico: 1844, Galeotti 587; Guadalupe, Valley of Mexico, August 24, 1903, Rose 

 & Painter 6535; Guadalupe, October 11, 1861, Bourgeon 518; Cerro de Guada- 

 lupe, alt. 2,250 metere, September 15, 1903, Pringle 11697; Chapultepec, 

 February, 1903, Pwrpus 58; near the city of Mexico, Bustamente y R.; 1838, 

 Vischer; City of Mexico, Bilimek 197; Valley of Mexico, Schaffner 184; 

 Ixtepeji, October, 1844, Galeotti 587. 

 'Hidalgo: Banks and ledges, Dublan, alt. 2,040 meters, September 16, 1902, 



Pringle 11142; Coxcatlan, September, 1909, Purpus 4210. 

 Queretaro: Near Queretaro, August, 1906, Rose & Rose 11151; Queretaro, 



November 21, 1827, Bcrlandier. 

 Vera Cruz: Orizaba, 1853, Miiller 913. 

 Guanajuato: Ravine near Guanajuato, 1891, Duges 299. 



Jalisco : Rocky banks of river, Falls of Juanacatlan, October 2, 1891, Pringle 3879- 

 In Central Mexico the shrub is known by the common name of jazmincillo, pos- 

 sibly because of the resemblance of the whitish flowers open at night to those of 

 some of the jasmines. 



Here may be introduced for convenience a related South American type: 

 Pihoniella glahrata (Heimerl) Standley, sp. nov. 

 Pisonia hirtella glabrata Heimerl, Ann. Cons. Jard. Geneve 5: 196. 1901. 

 Type locality, "Sorata," Bolivia. 

 Specimens examined: 



Bolivia: Vicinity of Coohabamba, 1891, Bang 1063; without definite locality, 



Bang 1809; Sorata, alt. 2,400 meters, February, 1886, Rusby 2500. 

 Argentina: Sierra de Tucuman, February, 1874, Lorcntz & Hieronymus 776. 

 This, the only other species of the genus, is well differentiated from /'. arboreseens 

 by its lack of pubescence and its different leaves. The two species occupy distinc 

 areas, neither being known to occur in the southernmost part of Mexico, in Central 

 America, or in any of the intervening countries of South America. 



4. PISONIA L. 



Pisonia L. Sp. PI. 1026. 1753. 



Calpidia Du Petit-Thou. Veg. Isles Austr. Afr. 37. pi. 10. 1806. 



Pallavia Veil. Fl. Flum. 151. 1825. 



Tragularia Koen.; Roxb. Fl. Ind. 217. 1832, as synonym. 



Type species, Pisonia aculeata L. 



The type species of Pallavia is Pisonia aculeata. 



The genus as generally understood is a rather large one, its representatives being 

 found in various parts of North and South America, the West Indies, Africa, Asia, 

 and Australia, as also on many of the islands of the Pacific. It consists of several 

 well-defined groups, some of which deserve generic rank. Torrubia, which has been 

 here included, was restored by Dr. N. L. Britton several years ago. 



KEY TO THE SPECIES. 



Stamina te flowers very narrowly campanulate, 5 mm. long (sub- 

 capitate) 1 . /'. donnellsmithii. 



Staminate flowers broadly campanulate, 3 mm. long or less. 

 Anthocarp 14 to 20 mm. long, the glands along its angles 



in more than one row 2. P. macranthocarpa. 



