there are very few trees on the island: on the northeast side of the island near the shell middens are two clusters of old california buckeyes ("aesculus californica"), a single red willow ("salix laevigata") and some blue elderberry ("sambucus mexicana"). around the two ponds in the quarry on the southern shore are several arroyo willows ("salix lasiolepis"). a few non-native monterey pine ("pinus radiata") and monterey cypress ("cupressus macrocarpa") have also been planted near the caretaker's residence.