138 Robinson and Greenman—Galdpagos Flora. 
with each other, is shown not only by Luphorbia viminea, 
ut by various other endemic species and groups of species of 
the same and other genera and orders. ; 
All the Galapageian species of Huphorbia for instance, with 
the exception of Z. amplewicaulis Hook. fil., form a closely 
related group, doubtless having a comparatively recent com- 
The forms of Euphorbia viminea Hook. fil. are as follows: 
Forma ALBEMARLENSIS(typica). Internodes 4 to 5} lines long * 
leaves of the stem and of the slender elongated branches 2 0 5 
margins except near the apex strongly revolute; leaves 0 : 
fascicles and scarcely developed branchlets similar but only 1 nt 
lines long and more distinctly retuse at the apex.—Albema 
Island; collected first by Macre, and again by Dr. Baur on thé 
southern end of the island in July, and on the eastern side 10 
August, 1891. 
orma JAconensis. Internodes 3 to nearly 6 lines long: att 
of the stems and branches 3 to 6 lines long, half a line broae, 
scarcely dilated at the apex ; fascicled leaves as in the preceding: 
—Collected by Dr. Baur near Orchilla Bay, James Island, 18 be 
Ene tana from the last by its slightly longer and less dilat 
eaves, 
Forma CasTeLtana. Internodes 24 to 4 lines long: leaves Ae 
stem and branches 3 to 4 lines long, three-fourths lines bro : 
a line in width at the dilated apex, truncate and retuse, mue 
firmer and thicker than in any of the other forms, very pale above 
whitened beneath; fascicled leaves very short, 1 to 14 lines long: 
—Collected on Tower Island, by Dr. Baur, September, 1891. 
orma CHaTHAMENsis. Internodes from 3 to 5} lines rit» 
eaves of the stem and branches 4} to 7 lines long, half line broad, 
1 
slightly dilated at the truncate or often retuse tip, pale 10 the 
