@article {887, title = {Irregular pollen grains in some Hypericum species.}, journal = {Grana}, volume = {15}, number = {part 1 - 3}, year = {1976}, note = {Palynology. Geog=1 - 7KBD, Royal Botanic Gardens, Kew.}, pages = {117 - 125 (1975 publ. 1976) - Illus.}, keywords = {Systematics: ANGIOSPERMAE HYPERICACEAE: HYPERICUM}, author = {Clarke, GCS} }