536 VERBENACEZ. 
1. Petra arborea, H. B. K. Nov. Gen. et Sp. ii. p. 282; Griseb. Fl. Brit. W. 
Ind. p. 498. | 
Petrea mexicana, Willd., ex Schauer in DC. Prodr. x1. p. 619. 
Petrea erecta, Lodd. Bot. Cab. t. 1606. 
Petrea ovata, Mart. et Gal. in Bull. Acad. Brux. xi. p. 329. 
South Mexico, Cordillera of Vera Cruz, 6000 feet (Galeotti, 795; Linden, 18; 
Jurgensen, 28), valley of Cordova (Bourgeau, 2125), Zimapan (Coulter, 1174), Actopan 
(Schiede), Tampico (Berlandier ; Palmer).—VunnzvELA; TrintpaD. Hb. Kew. 
2. Petra volubilis, Jacq. Amer. p. 180, t. 114; DC. Prodr. xi. p. 618; Griseb, 
Fl. Brit. W. Ind. p. 498; Bot. Mag. t. 628. 
Panama, Lion-Hill station (8. Hayes), near Panama (Seemann, 594).—Southward to 
Braziu, and in the West Inpiges. Hb. Kew. 
3. Petrea, sp. - 
Sout Mexico, Yucatan and Tabasco (Johnson, 106). Hb. Kew. 
Perhaps not different from P. voludilis; specimen imperfect. 
9, CITHAREXYLUM. 
Citharexylum, Linn. Gen. Plant. n. 760; Benth. et Hook. Gen. Plant. ii. p. 1149. 
About twenty arboreous and shrubby species, inhabiting Tropical America from 
Mexico to Bolivia and Brazil. 
Probably half of the following names are synonyms. 
1. Citharexylum affine, D. Don in Edinb. New Phil. Journ. 1831, p. 238; DC. 
Prodr. xi. p. 611. | 
Sourn Mexico, Chalco (Andrieux, 135), Zimapan (Coulter, 1173), without locality 
(Mogino & Sessé). Hb. Kew. 
2. Citharexylum caudatum, Linn. Sp. Pl. p. 872; DC. Prodr. xi. p. 612. 
Citharexylum erectum, Jacq. Ic. Rar. t. 501. 
Citharexylum lucidum, Ch. et Schl. in Linnea, v. p. 97. 
_ Sourn Mexico, Mirador (Linden, 32), Jalapa, 2500 feet (Galeotti, 7051); Panama, 
Chagres (fendler, 290).—Jamatca; CuBpa. Hb. Kew. 
Grisebach (Fl. Brit. W. Ind. p. 497) regards C. caudatum, Linn., and C. lucidum, Ch. 
et Schl., as distinct species, recording the former as from Jamaica only. 
8. Citharexylum ellipticum, Sessé et Mog., ex D. Don in Edinb. New Phil. 
Journ. 1831, p. 238; DC. Prodr. xi. p. 614. 
MEXICO. 
4, Citharexylum incanum, Sessé et Mog., ex D. Don in Edinb. New Phil. 
Journ. 1831, p. 238; DC. Prodr. xi. p. 614. 
Mexico (Mogino & Sessé). 
