FLORA OF THE GALAPAGOS ISLANDS. 159 



longis. — Charles Isl. : Snodgrass & Heller, no. 452 (hb. Gr.); 

 Baar, no. 41 (hb. Gr.), and (?) Baur, no. 42 (hb. Gr.). 



Forma duncanensis, iuarmata; foliis anguste lanceolatis, base 

 apiceque acutis. — Duncan Isl. : Baur, no. 47 (lib. Gr.). Perhaps 

 only a young form. 



Forma jacobensis, spinis perbrevibus armata ; foliis late oblongis, 

 integerrimis, basi apiceque rotundatis mucrouatis supra lucidis et trans- 

 verse rujjulosis 1-1.3 cm, lonjfis. — James Isl. : a shrub 3 to 6 dm. higli, 

 in sand near beach, James Bay, Snodgrass & Heller, no. 364 (hb. Gr. ). 



Forma jervensis, spinis brevibus gracilibusque armata ; foliis late 

 oblongis integerrimis 1.7 cm. longis apice rotundatis margine valde 

 revolutis supra baud lucidis. — Jekvis Isl. : Baur, no. 46 (hb. Gr.). 



These forms possess, as will be seen from the above brief characters, 

 rather strikiug differences. It is, however, very difficult to tell how 

 much of this variation is due to permanent divergence of character and 

 how much to individual environment and age. The species as a whole i.s 

 very near C. I^lchohonii, Hook., but the branches do not exhibit the ten- 

 dency to induration at the tip so conspicuous in the species just mentioned. 

 G. galapageia was also collected by Habel ace. to Hemsl. in litt. O 



BURSERACEAE. 



BURSERA, L. 



'' B. GRAVEOLENS, Trian. & Planch. Ann. Sci. Nat. ser. 5, xiv. 303 

 (1872) ; Engl, in DC. INIonogr. iv. 49. Elaphrium graveolens, II BK. 

 Nov. Gen. & Sp. vii. 31 (1825). B. Tacamaco, Tul. Ann. Sci. Nat. 

 ser. 3, vi. 368 (1846). Spondlas Edmonstonei, Hook. f. (3), 230; 

 Anderss. (1), 243, & (2), 106; Rob. & Greenm. (1), 145. Giiaiacum, 

 Baur, Am. Nat. xxv. 220. — Galapagos Ids.: Goodridge (hb. Gr.) ; 

 Habel. AniNODON IsL. : common, largo, extending from the beach to 

 350 m. alt., Snodgrass «fe Heller, no. 809a (hb. Gr. ). Albemarlio 

 Isl.: Macrae; southern part, Baur, no. 58 (hb. Gr.) ; Elizabeth Bay, 

 abundant on the norlh shore, Snodgrass & Heller, no. 259 (hb. Gr.) ; 

 Iguana Cove, Snodgrass <Sc Heller, no. 21 (hb. Gr.) ; mountain east of 

 Tagus Cove, Snodgrass & Heller, no. 227 (hb. Gr.). Barrixgton 

 Isl. : small and leafless, 28 May, ace. to Mr. Heller. Charles Isl. : 

 Ednionston, ace. to Hook, f., 1. c. Chatham Isl. : rather common, ace. 

 to Mr. Heller. Hood Isl. : scattered and rather small, ace. to Mr. 

 Heller. Indefatigable Isl.: Sleindachuer in hi). N'ii'iina .M us., ace. 

 to Engl. 1. c. ; common on the norih coast, ace. to Mr. Heller. James 



