Vol. I] STEWART— BOTANY OF THE GALAPAGOS ISLANDS 83 



Forma bindloensis Rob. (1), 158. — Bindloe Isl. : common 

 bushes. The specimens have the stem armed and many of the 

 leaves are obtuse cuneate, (no. 1752). 



Forma carolensis Rob. (1), 158. — Abingdon Isl.: common 

 bushes to 500 ft. (no. 1753). Charles Isl.: 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 Isl. : 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). Seymour Isl., south : occa- 

 sional bushes. Stem unarmed, leaves similar to those described 

 byRob. 1. c, (no. 1760). 



Forma duncanensis Rob. (1), 159.— Barrington Isl.: 

 bushes with procumbent armed branches, leaves oblanceolate 

 acute with revolute margins, .4-1 cm. long, (no. 1754). Dun- 

 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). 



