| 1 |
Plants efarinose. |
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(2) |
| + |
Plants farinose, sometimes only sparsely so on calyx. |
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(10) |
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| 2 (1) |
Corolla 4-7 mm in diam.; leaves not cartilaginous on margin. |
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(3) |
| + |
Corolla more than 1 cm in diam.; leaves cartilaginous on margin. |
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(4) |
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| 3 (2) |
Scapes glandular; leaf blade coarsely pinnatifid-dentate with obtuse teeth |
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291 Primula sapphirina |
| + |
Scapes without glands; leaf blade sharply dentate on upper 1/2 of margin |
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292 Primula flabellifera |
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| 4 (2) |
Umbels compact; pedicel 1-2 mm, concealed in bracts |
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135 Primula faberi |
| + |
Umbels lax; pedicel usually more than 3 mm, distinctly longer than bracts. |
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(5) |
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| 5 (4) |
Leaf blade coarse dentate |
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137 Primula odontica |
| + |
Leaf blade denticulate or subentire. |
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(6) |
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| 6 (5) |
Leaf blade lanceolate to elliptic-lanceolate, apex acute; corolla lobes narrowly oblong |
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138 Primula virginis |
| + |
Leaf blade obovate to oblanceolate; corolla lobes suborbicular to elliptic. |
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(7) |
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| 7 (6) |
Leaf blade rounded or obtuse at apex. |
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(8) |
| + |
Leaf blade acute at apex. |
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(9) |
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| 8 (7) |
Plants delicate; corolla 0.8-1.2 cm |
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139 Primula silaensis |
| + |
Plants robust; corolla 1.2-1.6 cm |
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140 Primula amethystina |
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| 9 (7) |
Calyx 3.5-5 mm; corolla broadly campanulate, pubescent inside |
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141 Primula valentiniana |
| + |
Calyx 6-8 mm; corolla narrowly campanulate, glabrous inside |
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142 Primula kingii |
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| 10 (1) |
Plants dwarf, less than 5 cm tall |
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227 Primula nutantiflora |
| + |
Plants robust, more than 5 cm tall. |
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(11) |
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| 11 (10) |
Corolla red to purple. |
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(12) |
| + |
Corolla yellow or white. |
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(15) |
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| 12 (11) |
Leaf blade rounded to truncate at base |
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145 Primula alpicola |
| + |
Leaf blade attenuate at base. |
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(13) |
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| 13 (12) |
Calyx with vertical stripes of farina |
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116 Primula secundiflora |
| + |
Calyx without vertical stripes of farina. |
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(14) |
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| 14 (13) |
Corolla limb 0.6-1.3(-1.8) cm wide, shorter than tube; leaf blade erose-dentate |
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149 Primula waltonii |
| + |
Corolla limb 2-2.5 cm wide, longer than tube; leaf blade incised-dentate |
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150 Primula ioessa |
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| 15 (11) |
Leaf blade attenuate at base. |
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(16) |
| + |
Leaf blade cordate, truncate, or rounded at base. |
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(17) |
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| 16 (15) |
Leaves thin papery or submembranous, reticulate veins prominent abaxially |
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143 Primula sikkimensis |
| + |
Leaves firm papery or subleathery, reticulate veins obscure abaxially |
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144 Primula chumbiensis |
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| 17 (15) |
Leaf blade broadly ovate to ovate-oblong or suborbicular, slightly longer than wide or nearly as long as wide. |
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(18) |
| + |
Leaf blade elliptic to oblong, usually at least 2 × as long as wide. |
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(19) |
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| 18 (17) |
Scapes slender, 10-40 cm; umbels 2-8-flowered |
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147 Primula firmipes |
| + |
Scapes robust, 30-120 cm; umbels (10-)15-30(-80)-flowered |
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148 Primula florindae |
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| 19 (17) |
Bracts linear-lanceolate to subulate; calyx parted to near middle; leavesfirmly papery or subleathery |
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144 Primula chumbiensis |
| + |
Bracts lanceolate to ovate; calyx usually parted to 1/3; leaves thinly papery or submembranous. |
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(20) |
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| 20 (19) |
Calyx campanulate to tubular-campanulate, lobes triangular to triangular-lanceolate; stamens in pin flowers inserted near base of corolla tube |
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145 Primula alpicola |
| + |
Calyx tubular-campanulate, lobes lanceolate; stamens in pin flowers inserted at middle of corolla tube |
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146 Primula reticulata |
