SCROPHULARINEA. 459 
2. Silvia serpyllifolia, Benth. in DC. Prodr. x. p. 513. 
Gerardia serpyllifolia, H. B. K. Nov. Gen. et Sp. ii. p. 848. 
Norra Mexico, region of San Luis Potosi, 6000 to 8000 feet (Parry & Palmer, 685) ; 
SoutH Mexico, Chalco (Andrieux, 178), Lake Texcoco, valley of Mexico (Bourgeau, 107), 
near Lake San Cristoforo, at about 7000 feet (Humboldt & Bonpland). Hb. Kew. 
36. GERARDIA. 
Gerardia, Linn. Gen. Plant. n. 747; Benth. et Hook. Gen. Plant. ii. p- 972. 
An exclusively American genus of about thirty-five species, chiefly inhabiting the 
eastern side of North America, though there are some scattered nearly all over tropical 
and temperate South America. 
1. Gerardia dasyantha, Ch. et Schl. in Linnea, v. p. 104; DC. Prodr. x. 
p- d17. 
Mexico (Schiede & Deppe). 
2. Gerardia grandiflora, Benth. in Hook. Comp. Bot. Mag. i. p. 209; 
Prodr. x. p. 518; A. Gr. Synop. Fl. N. Am. ii. p. 291. 
Wisconsin and Iowa to TrennessrE and Trxas.—Norta Mexico, Sierra Madre, 
Coahuila (Palmer). Hb. Kew. 
3. Gerardia peduncularis, Benth. in Hook. Comp. Bot. Mag. i. p. 209; DC. 
Prodr. x. p. 518, cum B. guatemalenst, loc. cit. 
Nort Mexico, region of San Luis Potosi, 6000 to 8000 feet (Parry & Palmer, 670), 
Sierra Madre (Seemann, 2099); Sourn Mexico, Vera Cruz to Orizaba (Miller, 1175 ; 
Botteri, 1054; Galeotti, 1015; Bourgeau, 2707), Cordillera of Oaxaca, 7000 feet 
(Galeotti, 1014), Zimapan (Coulter, 1284), Zacuapan (Linden, 207), Chiapas ((Ghies- 
breght); Guatemaa (Skinner ; Hartweg). Hb. Kew. | 
4, Gerardia wrightii, A. Gr. in Torr. Bot. U.S. & Mex. Bound. Surv. p. 118; 
Synop. Fl. N. Am. ii. p. 292. 
Arizona.—Norta Mexico, between Babocomori and Santa Cruz, Sonora (Wright). 
37. CASTILLEJA. 
Castilleja, Mutis ex Linn. fil. Suppl. Gen. Plant. p. 47; Benth. et Hook. Gen. Plant. ii. p. 973. 
About thirty-five herbaceous species, the greater part inhabiting North America, 
including Mexico; a few the Andes of South America; ong of the Mexican species is 
widely dispersed in the Andes; another occurs in Brazil; and one of the North- 
American species is also widely dispersed in Northern Asia. The Mexican species 
are in need of revision; and many of the determinations below can only be regarded 
as approximations. | | 
3n 2 
