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Penstemon secundiflorus (8)	Penstemon secundiflorus var. secundiflorus (15)	Penstemon seorsus (5)	Penstemon serrulatus (20)
Penstemon sp. (12)	Penstemon speciosus (171)	Penstemon spectabilis (75)	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 subulatus (1)	Penstemon sudans (20)
Penstemon superbus (2)	Penstemon thompsoniae (32)	Penstemon thompsoniae ssp. jaegeri (8)	Penstemon thurberi (31)
Penstemon tracyi (29)	Penstemon triflorus (1)	Penstemon uintahensis (4)	Penstemon utahensis (72)
Penstemon venustus (12)	Penstemon virens (12)	Penstemon virgatus (1)	Penstemon virgatus var. asa-grayi (9)
Penstemon watsonii (22)	Penstemon whippleanus (52)	Penstemon wilcoxii (5)	Penstemon wislizeni (4)

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