Lady Bird Johnson Wildflower Center [LBJWC]. 2014. Penstemon deustus Douglas ex Lindl. Native Plant Database. Austin, TX: Lady Bird Johnson Wildflower Center. https://www.wildflower.org/plants-main [Accessed 2022 June 21].

Lady Bird Johnson Wildflower Center [LBJWC]. 2014. Penstemon deustus Douglas ex Lindl. Native Plant Database. Austin, TX: Lady Bird Johnson Wildflower Center. https://www.wildflower.org/plants-main [Accessed 2022 June 21].

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