FLORA OF THE GALAPAGOS ISLANDS. 159 
longis.— Cuartes Ist.: 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. — DuNncAN Ist.: Baur, no. 47 (hb. Gr.). Perhaps 
only a young form. 
Forma jacobensis, spinis perbrevibus armata; foliis late oblongis, 
integerrimis, basi apiceque rotundatis mucronatis supra lucidis et trans- 
verse rugulosis 1-1.3 cm, longis. — James Ist.: a shrub 8 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 haud lucidis. — Jervis Ist. : Baur, no. 46 (hb. Gr.). 
These forms possess, 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 the tip so conspicuous in the species just mentioned. 
C. galapageia was also collected by Habel acc. to Hemsl. in litt. 
BURSERACEAE. 
Bursera, L. 
B. GRAVEOLENS, Trian. & Planch. Ann. Sci. Nat. ser. 5, xiv. 803 
(1872) ; Engl. in DC. Monogr. iv. 49. Elaphrium graveolens, HBK. 
Nov. Gen. & Sp. vii. 81 (1825). £. Tacamaco, Tul. Ann. Sci. Nat. 
Ser. 3, vi. 368 (1846). Spondias Edmonstonei, Hook. f. (3), 230; 
Anderss, (1), 243, & (2), 106; Rob. & Greenm. (1), 145. Guaiaeum, 
Baur, A 
eg ABinGpon Ist.: common, large, extending from the beach to 
Ist a” Snodgrass & Heller, no. 809a (hb. Gr.). ALBEMARLE 
ay “erae; southern part, Baur, no. 58 (hb. Gr.); Elizabeth Bay, 
le on the north shore, Snodgrass & Heller, no. 259 (hb. Gr.) ; 
. a Cove, Snodgrass & Heller, no. 21 (hb. Gr.); mountain east of 
agus Cove, Snodgrass & Heller, no. 227 (hb. Gr.). BARRINGTON 
3 small and leafless, 28 May, acc. to Mr. Heller. Cuartes Ist.: 
. ay ace. to Hook. f.,1.c. CuarHam Isx.: rather common, ace. 
". Heller. Hoop Isz.: scattered and rather small, acc. to Mr. 
INDEFATIGABLE Ist. : Steindachner in hb. Vienna Mus., ace. 
to 
nel. 1. c.; common on the north coast, acc. to Mr. Heller. James 
