Thomson, J.D.; Wilson, P.; Valenzuela, M.; Malzone, M. 2000. Pollen presentation and pollination syndromes, with special reference to Penstemon. Plant Species Biology. 15(1): 11-29.

Thomson, J.D.; Wilson, P.; Valenzuela, M.; Malzone, M. 2000. Pollen presentation and pollination syndromes, with special reference to Penstemon. Plant Species Biology. 15(1): 11-29.

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