42 MISSOURI BOTANICAL GARDEN. 
as they are now known in the herbarium at once points 
to the probability of other equally interesting discoveries 
and indicates the need of definite outlining of the extremely 
limited ranges of most of those now recognized. 
In his exploration of the San Benito islands Dr. Palmer 
noticed on West San Benito two representatives of this 
genus, but he collected neither; his observation was recorded 
by Vasey and Rose (Contr. U. 5. Nat. Herb.1; 20. 1890) 
in their account of the plants of those islands. Though 
there is no improbability of more than one species of the set 
of A. Shawii being found on the rather isolated islands and 
the mainland about Sebastian Viscaino Bay—as actually ap- 
pears to be the case on the scarcely detached islands about 
Magdalena Bay, Dr. Rose though he had the occurrence of 
a second species in mind when he visited San Benito last 
spring did not then note its presence and I am unable to 
see anything except A. sebastiana in the herbarium mate- 
rial from that region. Among the living plants brought back 
by Dr. Rose, however, are small plants from San Benito, 
bearing the field number 41, which are very different from 
the herbarium material of the corresponding number, 16041, 
representing A. sebastiana. No doubt these living plants are 
of the second species noted by Dr. Palmer, which, though 
aberrant, is obviously of the Deserticolae, and for complete- 
ness is now given name and place, though its described char- 
acters unfortunately are comparable with those of a large 
majority of garden agaves and probably far from represen- ° 
tative of mature plants. 
One curious distributional fact is that the Campaniflorae 
and Datyliones are each represented by slightly differentiated - 
species, peculiar respectively to the Cape region and the mid- 
peninsula. 
All of the Lower Californian agaves referred to in such 
publications as I have seen are accounted for in the follow- 
ing pages, except A. spiralis, which Mr. Brandegee tells me 
was found wild about La Paz and in his garden at San Diego 
responded to the care given it by developing into a truly 
arborescent plant about 3 m. high which suckered freely so 
