Recommended books about cherry blossoms:
Ornamental Cherries in Vancouver, by Douglas Justice
Flowering Cherries, by Geoffrey Chadbund.
Japanese Flowering Cherries, by Wybe Kuitert.
Trees of Vancouver, by Gerald Bane Straley.
Ornamental Cherries, by Ingram Collingwood.
Thank you to Douglas Justice for providing this list of resources during the Blossom Biology workshop at VanDusen Garden.