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Identifying a Mystery Pinguicula: primuliflora or caerulea?

A grower bought an unnamed Pinguicula from a retail store (photo via TinyPic).

Identification

Most likely P. primuliflora – leaves match, but it's been in very low light. Could also be P. caerulea. Differentiate at flowering: primuliflora has purple flowers with yellow center; caerulea has tall blue-striped flowers. Both are southeastern US natives.

Carnivorous Plants: Pinguicula ‘Aphrodite’ Color Change and Poi Dog Nepenthes Temperature Tolerance; Damaged Sarracenia Hood: Cut or Keep?; Fungus Gnats in Outdoor Bog Garden: Unusual—Check Setup; Mexican Butterworts (Pinguicula gigantea) Struggling in Arizona Heat; Identifying a Mystery Sarracenia from Lowe's: Hybrid or Species?; Black Spot on Nepenthes New Shoot: Cosmetic Damage, Not a Health Crisis; Identifying Nepenthes × ventrata (deRoose's Alata) and Pitcher Maintenance; Mystery Plant Identified: It's Catnip (Nepeta cataria); Purple Passion Plant (Gynura aurantiaca) Identified; Removing Large Creeping Juniper Without Chemicals

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