Turn left and walk to oasis. Look at large shrub to your left across from pond in oasis. It is labeled Feltleaf Ceanothus. Ceanothus arboreus Feltleaf Ceanothus, Catalina C., Catalina Mountain Lilac. Largest growing of the Ceanothus spp.
Leaves are alternate, ovate, finely toothed and the upper and lower surface has fine hairs.
Leaves on this species are probably the largest you'll find for Ceanothus spp . Flowers are powder blue color and fragrant. Prefers soils with good drainage and can survive without supplemental water. Growth rate is moderate. Likes full sun but can tolerate half shade.