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Aesculus californica
http://www.botany.hawaii.edu/faculty/carr/images/aes_cal_fl.jpg
Closeup photo of flower.
Aesculus californica
http://www.fs.fed.us/database/feis/plants/tree/aescal/
Information on distribution and occurrence, value and use, characteristics, and fire ecology.
Aesculus californica (California Buckeye)
http://www.cnr.vt.edu/dendro/dendrology/syllabus/acalifornica.htm
Physical characteristics of leaf, flower, fruit, twig, and bark. Provides images.