208 . COMPOSITA. 
Soura Mexico, Guadalupe, Tacubaya, San Angel, &c., valley of Mexico, 6950 feet 
(Humboldt & Bonpland; Bourgeau, 164, 705; Bilimek, 491; Schaffner), Zimapan 
(Coulter, 348; Galeotti, 2434), Real del Monte (Coulter, 376; Galeotti, 2432), Oaxaca, 
5000 feet (Galeotti, 2119). Hb. Kew. 
6. Tridax obovata, Turcz. in Bull. Soc. Nat. Mosc. xxiv. p. 187; Walp. Ann. v. 
p. 238. 
Souta Mexico, Sierra San Pedro Nolasco &c. (Jurgensen, 124). Hb. Kew. 
7. Tridax palmeri, A. Gr. in Proc. Amer. Acad. xv. p. 38. 
Norta Mexico, on rocky bluffs at Alvarez, thirty miles south-east of San Luis, at 
8000 feet (Parry & Palmer, 489, 490, and 4823). Hb. Kew. 
8. Tridax procumbens, Linn. Sp. Pl. ed. 1, p. 900; DC. Prodr. v. p. 679. 
Amellus pedunculatus, Ort., ex Willd. 
North Mexico, Monterey (Haton & Edwards), region of San Luis Potosi, 6000 to 
8000 feet (Parry & Palmer, 520); Soura Mexico, Orizaba (Sallé), Yucatan (Linden, 
1242), Zacuapan &c., Vera Cruz (Linden, 486; Galeotti, 2275); Guatemata, Volcan 
de Fuego, 3800 feet (Salvin); Nicanaaua (Grsted); Costa Rica (Grsted); Panama, 
old walls about the city of Panama (S. Hayes, 692).—North part of Soura AMERICA 
and the West InpIEs; also naturalized in India and Mauritius. Hb. Kew. 
9. Tridax trifida, A. Gr. in Proc. Amer. Acad. xv. p. 39. 
Piilostephium trifidum, H. B. K. Nov. Gen. et Sp. iv. p. 255, t. 388. 
SoutH Mexico, between Guanajuato and Valladolid, at 5400 feet (Humboldt & 
Bonpland). 
Var. alboradiata, A. Gr. in Proc. Amer. Acad. xv. p. 39. | 
_ Norta Mexico, region of San Luis Potosi, 6000 to 8000 feet (Parry & Palmer, 511). 
Hb. Kew. 
10. Tridax trilobata, Hemsley. 
Galinsoga trilobata, Cav. Ic. Pl. ii. p. 42, t. 282; Bot. Mag. t. 1895; Sweet, Brit. Fl. Gard. t. 56. 
Sogalgina trilobata, Cass. Dict. xlix. p. 897; DC. Prodr. v. p. 678. 
South Mexico, Pedregal (Bourgeau, 846). Hb. Kew. 
146. LAYTA. 
Layia, Hook. et Arn. Bot. Beech. Voy. p. 148, non eorund. loc. cit. p. 182; Benth. et Hook. Gen. 
Plant. ii. p. 395. 
A North-American genus of about a dozen herbaceous species, chiefly inhabiting 
California and New Mexico. 
1. Layia (Madaroglossa) neomexicana, A. Gr. Pl. Wright. ii. p. 98. 
New Mexico.—Norra Mexico, Chihuahua (Parry). 
