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. trinervia Cay. 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 
(rythradenia is Mexican, Eupiqueria 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 types and of all the specimens of the genus 
found in several of the leading herbaria of Europe. 
PIQUERIA Cay. (in memoriam Andreae Piquerii — hispanice, An- 
drés Piquer —medici hispanici et auctoris philosophici). — Capitula 
parva homogama 3-20-flora, involucro ovoideo vel eylindrico vel 
campanulato, squamis saepius paucis subaequalibus laxe imbricatis 
vel subuniseriatis, receptaculo nudo plano 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 longe exserti saepe valde recurvati. 
Antherae breviter oblongae, connectivo apice nec incrassato nec ap- 
pendiculato. —Ic. iii, 18, t. 235 (1795); Usteri, N. Ann. xviii. 62 
(1800) ; Pers. Syn. ii. 397 (1807) ; Rees, Cycel. xxvii. (1814) ; Cass. Bull. 
Soc. Philom. 1819, p. 127 (1819), et Dict. Sci. Nat. xli. 115 (1826) ; Less. 
Syn. 154 (1832); DC. Prod. v. 104 (1836) ; Endl. Gen. 366 (1838) ; 
Reichenb. Nom. 97 (1841); Jameson, Syn. Pl. Aequat. ti. 75 (1865) ; 
Benth. et Hook. f Gen. ii. 238 (1873); Hemsl. Biol. Cent.-Am. Bot. 
ii. 77 (1881); Hoffm. in Engl. et Prantl, Nat. Pflanzenf. iv. Ab. 5, 
133 (1890); Hook. £ et Jacks. Ind. Kew., ii. 544 (1894); Bailey et 
tt 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. 
