Vor. I] STEWART—BOTANY OF THE GALAPAGOS ISLANDS 83 
Forma bindloensis Rob. (1), 158.—BrInpLok Ist. : common 
bushes. The specimens have the stem armed and many of the 
leaves are obtuse cuneate, (no. 1752). 
Forma carolensis Rob. (1), 158.—AsBincpon Ist.: common 
bushes to 500 ft. (no. 1753). CHAR Es Ist.: bushes 6-7 ft. 
high to 700 ft. Specimens taken below 350 ft. have larger 
leaves than do those from around 700 ft., (nos. 1758-1759). 
CHATHAM Ist.: Wreck Bay, common bushes on the lower 
parts. The type specimen of the species was collected on this 
island by Darwin and is described by Hook. f., 1. c., as being 
unarmed with the leaves linear lanceolate acute. The specimen 
under consideration has the stem armed with the leaves varying 
from oblong obtuse to spatulate. It resembles the form caro- 
lensis very much, (no. 1757). Srtymour Is., sourH: occa- 
sional bushes. Stem unarmed, leaves similar to those described 
by Rob. |. c., (no. 1760). 
Forma duncanensis Rob. (1), 159.—Barrineron Ist.: 
bushes with procumbent armed branches, leaves oblanceolate 
acute with revolute margins, .4-1 cm. long, (no. 1754). Duwn- 
CAN IsL.: prostrate bushes above 300 ft. The specimen is 
armed with very strong spines, leaves oblanceolate with mar- 
gins strongly revolute, .9-1.6 cm. long. The type specimen is 
evidently a young branch, the leaves at the base of which tend 
to assume the revolute form. There is a single weak spine on 
the type specimen, (no. 1755). Jervis IsL.: occasional pros- 
trate bushes to 1050 ft. Stem armed, leaves attenuate obtuse, 
.6-1.9 cm. long, (no. 1756). There is much variation in the 
arming of the stems and in the size of the leaves in the speci- 
mens from the different islands, as well as in specimens from 
the same island. The specimen from Barrington has the larg- 
est leaves and spines intermediate in size, that from Duncan 
has the leaves intermediate in size and the largest spines, while 
the specimen from Jervis has the smallest spines. The most 
important character which the specimens from the different 
islands have in common is the procumbent habit. 
Forma jacobensis Rob. (1), 159.—James IsL.: James Bay, 
bushes 4-5 ft. high, fairly common below 300 ft. Stem armed, 
leaves broadly oblong obtuse to lance-oblong acute, with or 
without revolute margins on the same specimen, (no. 1761). 
