Riggin'S Penstemon (Penstemon triphyllus)
Description
Penstemon triphyllus is a member of Penstemon subg. Saccanthera sect. Saccanthera subsect. Serrulati (Bennett et al. 1987). It is unusual in having whorls of three leaves at each node.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Magnoliophyta
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Class: Magnoliopsida
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Order: Lamiales
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Family: Plantaginaceae
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Genus: Penstemon
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