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Penstemon pseudospectabilis (20)	Penstemon pseudospectablis (1)	Penstemon purpusii (4)	Penstemon rattanii (4)
Penstemon rattanii var. kleei (3)	Penstemon rhizomatosus (4)	Penstemon richardsonii var. dentatus (5)	Penstemon roezlii (42)
Penstemon rostiflorus (2)	Penstemon rostriflorus (98)	Penstemon rubicundus (7)	Penstemon rupicola (28)
Penstemon rydbergii (9)	Penstemon rydbergii var. oreocharis (35)	Penstemon rydbergii var. rydbergii (8)	Penstemon scapoides (35)
Penstemon secundiflorus (4)	Penstemon serrulatus (9)	Penstemon sp. (16)	Penstemon speciosus (96)
Penstemon spectabilis (40)	Penstemon spectabilis var. spectabilis (23)	Penstemon spectabilis var. subviscosus (24)	Penstemon spectabilis? (1)
Penstemon stephensii (24)	Penstemon strictus (5)	Penstemon sudans (7)	Penstemon superbus (1)
Penstemon thompsoniae (8)	Penstemon thompsoniae ssp. jaegeri (4)	Penstemon thurberi (27)	Penstemon tracyi (5)

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