Lady Bird Johnson Wildflower Center [LBJWC]. 2017. Penstemon speciosus. Austin, TX: Lady Bird Johnson Wildflower Center. http://www.wildflower.org/plants/result.php?id_plant=PESP [Accessed 2017 May 22].

Lady Bird Johnson Wildflower Center [LBJWC]. 2017. Penstemon speciosus. Austin, TX: Lady Bird Johnson Wildflower Center. http://www.wildflower.org/plants/result.php?id_plant=PESP [Accessed 2017 May 22].

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