Lady Bird Johnson Wildflower Center [LBJWC]. 2020. Penstemon acuminatus Douglas ex. Lindl. Native Plant Database. Austin, TX: Lady Bird Johnson Wildflower Center. https://www.wildflower.org/plants-main [Accessed 2022 April 14].

Lady Bird Johnson Wildflower Center [LBJWC]. 2020. Penstemon acuminatus Douglas ex. Lindl. Native Plant Database. Austin, TX: Lady Bird Johnson Wildflower Center. https://www.wildflower.org/plants-main [Accessed 2022 April 14].

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