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The scape is slender, 1-5 cm tall, sparsely glandular. 1-4 flowers are borne at the apex of the scape, sessile without pedicels.
The corolla is blue-purple, 4.5-6 mm long, with a short tube nearly equaling the calyx, and a limb diameter of 4-6 mm. The lobes are nearly square or slightly inverted-ovate to elliptic, 2-lobed at the apex.
Primula sapphirina has a bell-shaped corolla that hangs downwards, lacks spherical hair tufts at the throat, and has shorter flower styles compared to Primula primulina.