28o 
ALBAN STEWART 
botanist of the expedition sent hence by the CaHfornia Academy of 
Sciences, as well as to extend its range to Abingdon, Barrington, Hood,, 
Indefatigable, Narborough, and Seymour, so that this species is now 
known to occur on all of the larger islands of the group. After re- 
turning from the expedition I studied the collections and prepared the 
results for pubhcation at the Gray Herbarium. I felt some doubt 
about the distinctness of the forms described by Robinson after I had 
compared the Academy specimens with his material. In fact I was 
convinced that the form jervensis did not differ from the form albe- 
marlensis, and I considered it as such in my work upon the flora of 
these islands.^ The time at my disposal then would not allow me to 
make a critical study of this species so that it had to be abandoned 
until now. 
Forma albemarlensis Robinson 
This form is described as being unarmed or armed with small 
slender spines. Leaves oblong obtuse mucronate, 1.5-3.4 cm. long, 
very often furnished with 1-2 small lateral teeth; not shiny above. 
After comparing the Academy material with the type specimen of this 
form, I succeeded in a way in matching specimens from Albemarle, 
Indefatigable, and Narborough Islands with it. The specimens from 
these islands can be separated into two groups, viz., those which have 
the stem unarmed, and those which have the stem armed with spines 
to a greater or less extent. In the unarmed group are specimens from 
Tagus Cove and Villamil, Albemarle Island, and from the northeast 
and southeast sides of Indefatigable Island, while in the armed group 
are specimens from the northwest side of Indefatigable and from 
Narborough Islands. The armed specimen from Indefatigable 
Island is provided with short spines which are somewhat thickened at 
the base, while the specimen from Narborough Island has but one 
spine on it which is slender and nearly 7 mm. long. 
Great variation occurs in the leaf characters of the different speci- 
mens, well illustrated in figure i, which consists of tracings of leaves 
taken from a specimen collected at Tagus Cove, Albemarle Island. 
Leaves which are distinctly of the oblong obtuse mucronate type, 
similar to those described as being typical of this form, occur on this 
vSpecimen, figure I a. In addition to this kind of leaf, however, there 
are still others, which are rather oblanceolate mucronate, figure I h] 
^ A Botanical Survey of the Galapagos Islands, Proc. Calif. Acad. IV., i: 82. 
1911. 
