472 LOASEA, 
1. Cevallia sinuata, Lag. Nov. Gen. et Sp. p. 11, t. 1: Hook. Ic. Pl. t, 252. 
Trxas; New Mexico.—Norta Mexico, Sonora (Lorrey); San Luis Potosi to San 
Antonio, Texas (Parry, 258). Hb. Kew. 
3. PETALONYX. 
Petalonyx, A. Gray, Pl. Thurb. in Mem. Amer. Acad. v. p- 319 ; Benth. et Hook. Gen. Plant. i. p. 803. 
Monotypic. | 
1. Petalonyx thurberi, A. Gray, Pl. Thurb. p. 319; Torrey in Rep. Emory’s 
Exped. t. 22. 
Nort Muxico, valley of the Gila, Sonora (Thurber, 683). Hb. Kew. 
. 4. SCLEROTHRIX. 
Sclerothriz, Presl, Symb. Bot. ii. p. 3; Benth. et Hook. Gen. Plant. i. p. 803. 
Two or three species, ranging from Mexico to Peru. 
1. Sclerothrix fasciculata, Presl, Symb. Bot. ii. p. 3, t. 53. 
Ancyrostemma micranthum, Poepp. et Endl. Nov. Gen. et Sp. iii. p. 65, t. 272. 
SourH Mexico, Orizaba (Sal/é).—VENEZUELA and CotomBia to Perv. Hb. Kew. 
5. MENTZELIA. 
Menizelia, Linn. Gen. Plant. n. 670; Benth. et Hook. Gen. Plant. i. p. 804. 
About thirty species, growing chiefly on the western side of North and South 
America. 
1. Mentzelia hispida, Willd. Sp. Pl. ii. p. 1176; Bot. Mag. t. 3205. 
Mentzelia stipitata, DC. Prodr. iii. p. 843; Calques des Dess. Fl. Mex. 358; The Botanist, i. t. 34. 
Mentzelia aspera, Cav. nec Linn. 
CaLiForNia.—NortH Mexico, Zacatecas (Coulter, 54; Hartweg, 16), region of San 
Luis Potosi, 6000 to 8000 feet (Parry & Palmer, 257); Sourx Mexico, Tacubaya 
(Bilimek, 250), Cordillera of Oaxaca (Galeotti, 3681), Real del Monte (Coulter, 53), 
valley of Mexico (Bourgeau, 295; Schaffner, 160 or 149), without locality (Parkinson). 
—Southward to Peru. Hb. Kew. 
2. Mentzelia lobata, Hemsley. 
Microsperma lobata, Hook. Ic. Pl. t. 234. 
- Eucnide lobata, A. Gray, Pl. Lindh. p. 192. 
Microsperma rudis, Schauer in Linnea, xx. p. 721? 
Norta Mexico, Saltillo &c. (Gregg), Santa Catarina, near Monterey, Nuevo Leon 
(Berlandier, 1390); SovrH Mexico, Zimapan (Coulter, 5d), Oaxaca (Ghiesbreght). 
Hb. Kew. 
