170 | | RUTACEAE. 
8. POLYASTER. 
Polyaster, Hook. fil. in Benth. et Hook. Gen. Plant. i. p. 299. 
A monotypic shrubby genus. 
1. Polyaster boronioides, Hook. fil. in Benth. et Hook. Gen. Pl. i. p. 299. 
SoutH Mexico, Zimapan (Coulter, 874). Hb. Kew. 
9. MEGASTIGMA. 
Megastigma, Hook. fil. in Benth. et Hook. Gen. Plant. i. p. 299. 
The genus is limited to the two following shrubby species :— 
1. Megastigma galeottii, Baill. Adans. x. p. 331. 
SoutH MzExico, cactus-abounding plains on the Cordillera of Oaxaca ( Galeotti, 7012). 
Hb. Kew. 
2. Megastigma skinneri, Hook. fil. in Benth. et Hook. Gen. Pl. i. p. 299. 
GUATEMALA, without locality (Skinner). Hb. Kew. 
10. ESENBECKIA. 
Esenbeckia, Kunth, in H. B. K. Nov. Gen. et Sp. vii. p. 246; Benth. et Hook. Gen. Plant. i. 
p. 299. 
A genus comprising upwards of twenty arboreous and shrubby species, restricted to 
America and the West Indies. 
1. Esenbeckia berlandieri, Baill. Adans. x. p. 151. 
North Mzxico, the woods around Tampico, Tamaulipas (Berlandier, 3125). Hb. 
Kew. 
Tribe TODDALIEZ. - 
The members of this tribe are spread over nearly the whole range of the family. 
11. PTELEA. 
Ptelea, Linu. Gen. Plant. n. 152; Benth. et Hook. Gen. Plant. i. p. 801. 
Shrubs or small trees; about six species, inhabiting North America, including 
- Mexico. 
1. Ptelea angustifolia, Benth. Pl. Hartw. p. 9. 
Texas ; New Mexico ; Catirornta.x—Nortu Mexico, Leon and Zacatecas (Hartweg, 42). 
Hb. Kew. | 
2. Ptelea parvifolia, A. Gray, MSS. in Hb. Kew. 
Fruticosa glabra dense ramosa, foliis suboppositis petiolatis trifoliolatis, foliolis subcoriaceis cre- 
berrime nigro punctatis sessilibus, lateralibus multo minoribus, floribus minutissimis tetra-. 
meris, fructu obovato-elliptico basi auriculato. | 
