| 1 |
Leaf blade pinnately lobulate. |
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(2) |
| + |
Leaf blade entire or denticulate. |
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(3) |
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| 2 (1) |
Corolla rose to purple; leaf blade lobed to near midvein |
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151 Primula lungchiensis |
| + |
Corolla white; leaf blade lobed to 1/4 |
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152 Primula lactucoides |
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| 3 (1) |
Corolla yellow. |
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(4) |
| + |
Corolla rose-purple or lilac, rarely white. |
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(11) |
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| 4 (3) |
Corolla lobes linear, 1-2 mm wide |
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182 Primula tangutica |
| + |
Corolla lobes oblong to suborbicular, 3-6 mm wide. |
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(5) |
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| 5 (4) |
Plants glandular puberulent; leaf blade 2-2.5 cm |
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174 Primula cerina |
| + |
Plants glabrous; leaf blade much more than 2.5 cm. |
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(6) |
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| 6 (5) |
Leaf blade short attenuate at base, shorter than petiole |
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186 Primula handeliana |
| + |
Leaf blade long attenuate at base, longer than petiole. |
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(7) |
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| 7 (6) |
Corolla lobes broadly elliptic to suborbicular, 6-8 mm wide. |
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(8) |
| + |
Corolla lobes oblong, 3-5 mm wide. |
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(9) |
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| 8 (7) |
Scapes with 2 umbels; pedicel puberulent |
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178 Primula reflexa |
| + |
Scapes with 1 umbel; pedicel glabrous |
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179 Primula soongii |
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| 9 (7) |
Corolla lobes strongly reflexed, lying against tube |
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183 Primula szechuanica |
| + |
Corolla lobes ± spreading, not lying against tube. |
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(10) |
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| 10 (9) |
Plants efarinose; corolla pale yellow |
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184 Primula aemula |
| + |
Plants ± farinose; corolla purplish or yellow |
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181 Primula advena |
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| 11 (3) |
Corolla lobes narrowly oblong to linear. |
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(12) |
| + |
Corolla lobes elliptic to oblong. |
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(14) |
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| 12 (11) |
Corolla lobes linear, 1-2 mm wide |
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182 Primula tangutica |
| + |
Corolla lobes oblong, 2.5-3 mm wide. |
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(13) |
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| 13 (12) |
Calyx parted to 1/3 |
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180 Primula maximowiczii |
| + |
Calyx parted to middle |
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181 Primula advena |
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| 14 (11) |
Pin flower style or thrum stamens reaching mouth of corolla tube. |
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(15) |
| + |
Pin flower style or thrum stamens reaching middle of corolla tube, slightly longer than calyx. |
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(17) |
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| 15 (14) |
Leaf blade elliptic to oblong-elliptic, base short attenuate |
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158 Primula hoi |
| + |
Leaf blade obovate to oblanceolate or spatulate, base long attenuate. |
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(16) |
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| 16 (15) |
Calyx parted to middle or slightly below, lobes oblong-lanceolate, pedicel farinose |
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156 Primula optata |
| + |
Calyx parted to below middle, lobes lanceolate, pedicel efarinose |
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157 Primula limbata |
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| 17 (14) |
Leaf blade ovate, obtuse to subrounded at base; petiole 2-3 × as long as blade |
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153 Primula woonyoungiana |
| + |
Leaf blade obovate to spatulate, tapering at base; petiole seldom ca. 2 × as long as leaf blade. |
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(18) |
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| 18 (17) |
Leaf rosette at least 10 cm tall, base with few triangular bud scales; leaves efarinose or nearly so at anthesis |
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156 Primula optata |
| + |
Leaf rosette 2-8 cm tall, without basal bud scales but with old curling petioles; leaves conspicuously farinose at anthesis. |
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(19) |
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| 19 (18) |
Outer leaves oblong-spatulate to lanceolate, inner leaves narrowly oblanceolate; corolla tube ca. 1.5 × as long as calyx |
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154 Primula diantha |
| + |
Leaves spatulate to oblong-spatulate or oblanceolate; corolla tube at least 2 × as long as calyx |
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155 Primula minor |
