FLORA OF THE GALAPAGOS ISLANDS. 159 



]()ngi>'. — Charles Isl. : Snodgrass & Heller, no. 452 (hb. Gr.); 

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



Forma duncanensis, inarmata ; foliis anguste lanceolatis, base 

 apiceque acutis. — Duncan Isl. : Baur, no. 47 (hb. Gr.). Perliaps 

 only a young form. 



Forma jacobensis, spinis perbrevibns arraata ; foliis late oblongis, 

 integerrimis, basi apiceque rotundatis mucronatis supra lucidis et trans- 

 verse rugulosis 1-1.3 cm. longis. — Ja:mes Isl.: a shrub 3 to 6 dm. high, 

 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 hand lucidis. — Jekvis Isl. : Baur, no. 4G (hb. Gr.). 



These forms po?.«ess, as will be seen from the above brief characters, 

 rather striking 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 is 

 very near C, Nicholsonii, Hook., but the branches do not exhibit the ten- 

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

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



BURSERACEAE. 



BURSERA, L. 



B. GRAVEOLENS, Trlan. & Planch. Ann. Sci. Xat. ser. 5, xiv. 308 

 (1872) ; Engl, in DC. IMonogr. iv. 49. Elnphrium graveolens, HBK. 

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

 ser. 3, vi. 368 (1846). Sponduis Edmonsfonei, Hook. f. (3), 230; 

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

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

 Habel. Abingdon Isl. : common, large, extending from the beach to 

 350 m. alt., Snodgrass & Heller, no. 809a (hb. Gr.). Albemarle 

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

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

 Iguana Cove, Snodgrass & 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 JMr. Ileller. Charles Isl. : 

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

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

 Heller. iNDEii-ATiGABLE Isl. : Steindachner in hb. Vienna jMus., ace. 

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



