110 Plants of Santa Catalina Island. [ ZOE 
mente, and various islets and rocks about Santa Catalina and Santa 
Cruz. Dr. Gray sayst that it is nearly allied to ZL. acerifolia and 
L. phenicia of the Canary Islands. Like them it loves the sea, and 
it is extensively planted near San Francisco by market gardeners as 
a wind-break to protect their tender vegetables from the sharp sea 
winds. Though so abundant and so widely spread in cultivation, 
it has never, so far as known, become naturalized on the mainland, 
and if it ever does so will probably inhabit the rocky cliffs of the 
southern coast. : 
The four species described from various islands off the coast of 
California and Baja California—Z. assurgentifiora; L. insularis from 
Coronados Islands, near San Diego; ZL. venosa from San Benito; 
and L. occidentalis from Guadalupe —are all very closely related, 
and the differences, slight as they are, seem not to be constant. 
Specimens of Z. assurgentifiora from San Miguel have a papillose, 
densely pubescent calyx; petals pubescent within and the villous 
tufts usually found at each side of the base meeting in front; 
the sides of the carpels only slightly veined. Specimens from 
a small rock scarcely a mile from the shore of Santa Catalina have 
much less of the stellate pubescence, the calyx enlarging and be- 
coming thin in fruit. The fruit of plants growing about San Fran- 
cisco is smaller; the carpels strongly veined; the calyx papillose, 
stellate pubescent and little enlarged in fruit. The division of the in- 
volucel is variable in degree. L. venosa (which I have not seen) ap- 
pears to agree with this species in the villous bases of the petals, 
and the venation of the sides of the carpels. ZL. occidentalis and 
L. insularis appear to be nearly identical. 
CEANOTHUS SoREDIATUS Hk. & Arn. of Mr. Lyon’s list has 
been since described as a new species — C. arboreus Greene. On 
this island it is a large bush, and was in full bloom from new wood, 
a common circumstance in the coast forms of Ceanothus, which in 
such localities flower continuously for a considerable period. The 
resemblance between this plant and specimens of C. azureus from 
northern Mexico (Pringle’s No. 2,533) is most striking. 
RHUS DIVERSILOBA T. & G. More variable than on the main- 
Ok most noticeable form often having five leaflets (Pl. iv, 
g. 2). : 
tBot. Cal. i, 83. 
