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Penstemon cardinalis (3)	Penstemon cardwellii (6)	Penstemon carnosus (5)	Penstemon centhrantifolius (1)
Penstemon centranthifolius (121)	Penstemon cinereus (1)	Penstemon cinicola (24)	Penstemon clevelandii (3)
Penstemon clevelandii var. clevelandii (46)	Penstemon clevelandii var. connatus (41)	Penstemon clevelandii var. mohavensis (6)	Penstemon clutei (6)
Penstemon comarrhenus (11)	Penstemon concerts (1)	Penstemon concinnus (16)	Penstemon confertus (23)
Penstemon confusus (32)	Penstemon cusickii (11)	Penstemon cyananthus (6)	Penstemon cyananthus var. cyananthus (7)
Penstemon cyananthus var. subglaber (5)	Penstemon cyaneus (16)	Penstemon davidsonii (53)	Penstemon davidsonii var. davidsonii (64)
Penstemon davidsonii var. menziesii (2)	Penstemon davidsonii var. praeteritus (6)	Penstemon debilis (4)	Penstemon decurvus (6)
Penstemon deustus (60)	Penstemon deustus var. deustus (15)	Penstemon deustus var. pedicellatus (20)	Penstemon deustus var. suffrutescens (23)

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