158 PROCEEDINGS OF THE AMERICAN ACADEMY, 



RUTACEAE. 

 Zanthoxylum, L. 



^ Z. Pterota, HBK. Nov. Gen. & Sp. vi. 3 (1823) ; Hook. f. (3), 

 231; Anderss. (1), 244, & (2), 106; Rob. & Greenm. (1), 145 

 {Xanthoxyloji) . Z. lentiscifuUuin, Anderss. 11. cc. Fagara Pterota, L. 

 Syst. Nat. ed. 10, 897 (1760) ; Engl. & Prantl, Nat. Pflanzenf. iii. Ab. 

 4, 117. F. lentiscifolia, H. & B. ace. to Willd. Enum. Ilort. Berol. 

 165. — Galapagos Ids.: Habel. Abingdon Isl, : alt. 525 m., Snod- 

 gruss & Heller, no. 836 (hb. Gr.). Albemarle Isl. : Iguana Cove, 

 Siwdgrass «fe Heller, nos. 53 (hb. Gr.), 903 (hb. Gr.) ; mountain east 

 of Tagns Cove, alt. 925 ra., Snodgrass & Heller, no. 231 (hb. Gr.). 

 Charles Isl. : Andersson, identity doubtful ; Lee (hb. U. S. Nat. Mus.). 

 Chatham Isl. : southwest end, middle region, Bauv, no. 40 (hb. Gr.). 

 James Isl. : Darwin. — Narborough Isl. : southern part, small tree, 

 abundant at 615 m. alt., Snodgrass & Heller, no. 333 (hb. Gr.). 

 Further distrib. S. United States, Mex., W. Ind., S. Am. 



SIMARUBACEAE. 

 Castela, Turp. 



^ C. galapageia, Hook. f. (3), 229, & (4), 262 ; Rob. & Greenm. (1), 

 145. C. galapageja, Anderss. (1), 243, & (2), 106. C. Galapngei, 

 Engl. & Prantl, Nat. Pflanzenf. iii. Ab. 4, 219. 



This species, like Euphorbia viminea and several other Galapageian 

 plants, shows pronounced formal differences on the different islands, thus: 



Forma typica, inarmata ; foliis lineari-lanceolatis acutis. — Chatham 

 Isl. : Darwin ; Baur ? 



Forma albemarlensis, inarmata vel aculeis parvis gracilibusque 

 armatis ; foliis oblongis obtusis mucronatis, 1.5-3.4 cm. longis, saepissime 

 dentibus 1-2 parvis lateralibus instructis, supra baud lucidis. — Albe- 

 marle Isl. ; southern part, Baur, no. 45 (hb. Gr.) ; Tagus Cove, Snod- 

 grass &. Heller, nos. 156 (hb. Gr.), 924 (hb. Gr.), the latter showing the 

 hitherto undescribed fruit to be obovoid, 12 mm. long, 9 mm. thick, very 

 smooth and shining. 



Forma bindloensis, inarmata ; foliis integerrimis, anguste obovatis, 

 rotundatis vel mucronulatis, 1-1.6 cm. longis, supra baud lucidis. — 

 BiNDLOE Isl. : B<mr, no. 43 (hb, Gr.). 



Forma carolensis. spinis brevibus robustioribus arniata ; foliis spatu- 

 latis basi manifeste attenuatis, demura supra valde lucidis 2-2.5 cm. 



