Vol. I] STEWART— BOTANY OF THE GALAPAGOS ISLANDS 85 



north side, extending to above 1800 ft. according to F. X. 

 Williams. Jervis Isl. : small trees on the lower parts (no. 

 1771). Narborough Isl.: north side, small trees on lava 

 beds (no. 1772). Tower Isl. : small trees, much infested with 

 lichens. This species forms one of the most common trees in 

 the dry and transition regions on the islands where it occurs. 

 It seldom attains a great height, usually having a broadly 

 spreading crown and a short thick trunk. Its absence from 

 Duncan Island is rather peculiar, as it is found on all of the 

 adjacent islands, and the conditions here do not seem to be 

 such as would inhibit its growth. Further distr. Mex., W. 

 Ind., S. Am. to Peru. 



B. malacophylla Rob. (1), 160. — Seymour Ids., north (?) 

 and SOUTH : Snod grass and Heller. ' At both the times our 

 party visited south Seymour, viz. in July and November, the 

 Bursera trees were out of foliage. So far as is known this 

 species does not occur on the north side of Indefatigable 

 although this island is separated from Seymour by a channel 

 which is only about a half mile in width and is probably of 

 comparatively recent origin. Endemic. 



POLYGALACEAE 



Poly gala L. 



P. Anderssonii Rob. (1), 160. P. puberula Anderss. (1), 

 232, (2), 100. — Indefatigable Isl. : northwest side, Anders- 

 son; Baur. Endemic. 



P. galapageia Hook. f. (3), 233; Rob. (1), 160.— Abing- 

 don Isl. : fairly abundant on the lava beds on the lower parts 

 (no. 1773). Albemarle Isl.: Cowley Bay, not abundant 

 (no. 1775) ; Tagus Cove, abundant from the beach to 600 ft. 

 (no. 1774). BiNDLOE Isl.: occasional in tufaceous soil near 

 the shore (no. 1776). Charles Isl.: Darzvin; Andersson; 

 Baur. Chatham Isl. : Wreck Bay, abundant in sandy soil 

 near the shore (no. 1777) ; north side, Baur. Indefatigable 

 Isl. : north side, abundant in light ashy soil near the shore (no. 

 1778) ; northwest side, abundant in tufaceous soil near the 

 shore (no. 1779). James Isl.: northeast side, specimens seen 

 at 200 ft. Jervis Isl. : Baur. Endemic. 



