Chari, J.; Wilson, P. 2001. Factors limiting hybridization between Penstemon spectabilis and P. centranthifolius. Canadian Journal of Botany. 79(12): 1439-1448.

Chari, J.; Wilson, P. 2001. Factors limiting hybridization between Penstemon spectabilis and P. centranthifolius. Canadian Journal of Botany. 79(12): 1439-1448.

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