RUTACER. 169 
5. Zanthoxylon pentanome, DC. Prodr. i. p. 725; Calques des Dess. Fl. Mex. 
187. | 
MEXiIco, without locality (Mogino & Sessé). 
6. Zanthoxylon pterota, Linn., H. B: K. Nov. Gen. et Sp. vi. p. 3. 
NortH Mexico, Santa Rosa, Cohahuila (Bigelow) ; Soura Mexico, Tepic (Lay), prov. 
Mexico (Bates), between Misantla and Nantla (Schiede & Deppe).—Also in the West 
Inpies. Hb. Kew. 
7. Zanthoxylon rigidum, H. B. K. Nov. Gen. et Sp. vi. p. 4. 
Panama (Duchassaing) — COLOMBIA. 
8. Zanthoxylon, sp. 
Soutn Mexico, valley of Cordova (Bourgeau, 2232). Hb. Kew. 
9. Zanthoxylon, sp. 
Sourn Mexico, Orizaba (Botteri, 990). Hb. Kew. 
10. Zanthoxylon, sp. 
SoutH Mexico, Jalapa (Linden, 728), region of Orizaba (Bourgeau, 2621). Hb. Kew. 
11. Zanthoxylon, sp. 
PANAMA, swampy ground near Frijoli railway-station (8. Hayes, 138). Hb. Kew. 
7. DECATROPIS. 
Decatropis, Hook. fil. in Benth. et Hook. Gen. Plant. i. p. 298. 
A monotypic, shrubby or arboreous genus. 
1. Decatropis coulteri, Hook. fil. /.c. (Tab. XIII.) 
Arbor (?), ramis novellis cano- vel rufo-velutinis. Folia alterna, imparipinnata, exstipulata, 4-5-juga, 
_ suprema 6-9-pollicaria, foliolis petiolulatis oppositis coriaceis lanceolatis oblongisve, 2—3-polli- 
caribus, retusis, subtus dense cano- vel rufo-velutinis, supra costa canaliculata hirsuta excepta 
glaberrimis, minutissima reticulatione notatis, petiolo bipollicari, rhachi petiolulisque crassis 
teretibus velutinis. Flores albi, parvi, sessiles, in paniculas amplas ramosas axillares dispositi, 
ramis panicularum calycibusque lanato-velutinis ; calyx subcupularis, 5-dentatus ; petala 5, 
lanceolata, membranacea; stamina 10, alterna breviora, filamentis filiformibus; ovarium alte 
5-lobum, glabrum, apice tori insertum, lobis dorso carinatis, inter carinas concavis, stylis 
connatis brevissimis, ovulis in loculis 2 collateralibus. Fructus ignotus. 
SoutH Mexico, Zimapan (Coulter, 871). Hb. Kew. 
EXPLANATION OF TAB. XIII. 
Flowering branch, natural size. 
Figs. 1 and 2, flowers, enlarged; 3 and 4, ovary, enlarged (one of the lobes removed from the 
latter). 
BIOL. CENT.-AMER., Bot. Vol. 1, Nov. 1879. | Z 
