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Penstemon rubicundus (22)	Penstemon rupicola (38)	Penstemon rydbergia (1)	Penstemon rydbergii (30)
Penstemon rydbergii var. aggregatus (3)	Penstemon rydbergii var. oreocharis (60)	Penstemon rydbergii var. rydbergii (8)	Penstemon scapoides (57)
Penstemon secundiflorus (8)	Penstemon serrulatus (9)	Penstemon sp. (12)	Penstemon speciosus (169)
Penstemon spectabilis (71)	Penstemon spectabilis var. spectabilis (41)	Penstemon spectabilis var. subviscosus (22)	Penstemon spectabilis? (1)
Penstemon stenophyllus (11)	Penstemon stephensii (24)	Penstemon strictus (17)	Penstemon subglaber (10)
Penstemon sudans (16)	Penstemon superbus (2)	Penstemon thompsoniae (19)	Penstemon thompsoniae ssp. jaegeri (12)
Penstemon thurberi (31)	Penstemon tracyi (29)	Penstemon triflorus (1)	Penstemon uintahensis (4)
Penstemon unilateralis (15)	Penstemon utahensis (70)	Penstemon venustus (9)	Penstemon virens (12)

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