ROBINSON. — STUDIES IN THE EUPATORIEAE. 5 



and southern Mexico, Central America, and Andean South America 

 to northern Chili. The only known exception to this range of the 

 genus is the occurrence of P. trhurvia Cav. in the mountains of 

 Haiti, a station called to my attention by Professor Urban. The 

 genus is capable of pretty clear division into four subgenera, of which 

 Erythradenia is Mexican, Eup'tqueria is of Mexico, Central America, 

 and Haiti, Phalacraea of the moister Andean region from Colombia to 

 Ecuador, and Artemisioides characteristic chiefly of the drier parts of 

 the Andes of Peru and Chili. 



Since the treatment of some eight species in DeCandolle's Prodromus 

 in 1836 no effort has been made to revise the genus, although the 

 number of its species has been considerably increased since that time. 

 The following revision has been drawn up after personal examination 

 of nearly all the specific t}^es and of all the specimens of the genus 

 found in several of the leading herbaria of Europe. 



PIQUERIA Cav. (in memoriam Andreae Piquerii — hispanice, An- 

 dres Piquer — medici hispanici et auctoris philosophici). — Capitula 

 parva homogama 3- » -flora, involucro ovoideo vel cylindrico vel 

 campanulato, squamis saepius paucis subaequalibus laxe imbricatis 

 vel subuniseriatis, receptaculo nudo piano vel leviter convexo. Co- 

 rollae tubulosae albae vel caerulescentes, tubo proprio saepissime brevi 

 piloso vel glanduloso-puberulo, faucibus saepe ampliatis, dentibus 

 limbi ovato-deltoideis suberectis vel saepius ovati-oblongis et paten- 

 tibus acutiusculis. Achaenia 5-angulata prismatica deorsum plus 

 minusve angustata basi saepe oblique callosa apice rotundata calva 

 vel disco annulari deciduo vel rarissime setis paucis brevibus coronata. 

 Styli rami filiformi-clavellati louge exserti saepe valde recurvati. 

 Antherae breviter oblongae, connectivo apice nee incrassato nee ap- 

 pendiculato. — Ic. iii. 18, t. 235 (1795); Usteri, N. Ann. xviii. 62 

 (1800) ; Pers. S)ti. ii. 397 (1807) ; Rees, Cycl. xxvii. (18U) ; Cass. Bull. 

 Soc. Philom. 1819, p. 127 (1819), et Diet. Sci. Nat. xli. 115 (1826) ; Less. 

 Syn. 154 (1832); DC. Prod. v. 104 (1836); Endl. Gen. 366 (1838); 

 Eeichenb. Nom. 97 (1841); Jameson, Syn. PI. Aequat. ii. 75 (1865); 

 Benth. et Hook. £ Gen. ii. 238 (1873) ; Hemsl. Biol. Cent. -Am. Bot. 

 ii. 77 (1881); Hoffm. in Engl, et Prantl, Nat. Pflanzeuf. iv. Ab. 5, 

 133 (1890) ; Hook, f et Jacks. Ind. Kew., ii. 544 (1894) ; Bailey et 

 Scott in Bailey, Cycl. Hort. iii. 1357 (1901). Phalacraea DC. Prod. v. 

 105 (1836); Endl. Gen. 366 (1838). Stevia Hort. — Herbae annuae 

 vel perennes vel frutices. Caulis erectus vel decumbens foliosus ramo- 

 sus. Folia opposita vel alterna petiolata vel subsessilia Integra vel 

 saepius serrata vel dentata vel rarius angulata. 



