| 1 |
Corolla campanulate, exannulate. |
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(2) |
| + |
Corolla funnelform, usually annulate. |
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(6) |
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| 2 (1) |
Corolla rose-lavender or rose-purple; calyx lobes oblong-lanceolate to lanceolate, apex subacute; capsule ca. 2 × as long as calyx |
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187 Primula boreiocalliantha |
| + |
Corolla yellow or white; calyx lobes oblong, apex rounded or obtuse; capsule usually ca. as long as calyx. |
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(3) |
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| 3 (2) |
Leaf blade laciniate-dentate |
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188 Primula agleniana |
| + |
Leaf blade regularly serrate or crenulate. |
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(4) |
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| 4 (3) |
Scapes robust, 5- or 6-flowered |
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189 Primula obliqua |
| + |
Scapes slender, 1- or 2-flowered. |
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(5) |
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| 5 (4) |
Leaf blade linear-lanceolate, 5-10 mm wide, base attenuate |
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190 Primula falcifolia |
| + |
Leaf blade ovate to ovate-lanceolate, 15-25 mm wide, base cordate to rounded or cuneate |
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191 Primula elizabethiae |
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| 6 (1) |
Calyx campanulate; corolla lobes dentate or lobed; capsule globose, submembranous, crumbled irregularly. |
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(7) |
| + |
Calyx tubular or narrowly campanulate; corolla lobes entire (lobed or dentate in P. calliantha, P. elongata, P. farreriana, P. macrophylla, P. megalocarpa); capsule oblong, opening by short teeth. |
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(25) |
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| 7 (6) |
Corolla yellow. |
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(8) |
| + |
Corolla lilac, rose-purple, or white. |
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(14) |
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| 8 (7) |
Leaf blade attenuate at base. |
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(9) |
| + |
Leaf blade rounded to cordate or short decurrent at base. |
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(11) |
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| 9 (8) |
Leaf blade crenate to denticulate; calyx lobes ovate to ovate-oblong, apex obtuse |
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86 Primula strumosa |
| + |
Leaf blade coarsely dentate or pinnatifid; calyx lobes ovate to lanceolate, apex acute or dentate. |
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(10) |
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| 10 (9) |
Leaf blade incised to pinnately lobed; pin flower style exserted from corolla tube |
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87 Primula chionata |
| + |
Leaf blade irregularly coarse dentate; pin flower style slightly exserted |
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88 Primula chionogenes |
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| 11 (8) |
Leaves efarinose, with scattered minute reddish brown or blackish glands abaxially |
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85 Primula calthifolia |
| + |
Leaves densely yellow farinose abaxially. |
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(12) |
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| 12 (11) |
Calyx 9-10 mm, parted to 2/3 |
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83 Primula jucunda |
| + |
Calyx 5-7.5 mm, parted to middle. |
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(13) |
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| 13 (12) |
Scapes 3-10 cm, usually shorter than leaf rosette; pin flower style ca. as long as corolla tube |
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84 Primula hilaris |
| + |
Scapes 7-18(-35) cm, longer than leaf rosette; pin flower style exserted from corolla tube |
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86 Primula strumosa |
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| 14 (7) |
At least some leaf blades cordate to truncate at base. |
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(15) |
| + |
Leaf blade attenuate at base. |
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(17) |
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| 15 (14) |
Leaf blade obtuse at apex, regularly crenulate; calyx efarinose, glandular |
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91 Primula tsariensis |
| + |
Leaf blade acute at apex, acutely dentate; calyx ± farinose. |
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(16) |
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| 16 (15) |
Calyx parted to 1/3, lobes triangular to subrectangular |
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89 Primula griffithii |
| + |
Calyx parted below middle, lobes lanceolate |
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90 Primula tanneri |
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| 17 (14) |
Pedicel 1-3 mm. |
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(18) |
| + |
Pedicel at least 5 mm. |
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(19) |
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| 18 (17) |
Flowers homostylous; stamens inserted at middle of corolla tube |
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98 Primula hookeri |
| + |
Flowers heterostylous; stamens in thrum flowers inserted toward apex of corolla tube |
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99 Primula bomiensis |
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| 19 (17) |
Corolla lobes crenate or entire. |
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(20) |
| + |
Corolla lobes emarginate. |
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(21) |
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| 20 (19) |
Leaf blade irregularly lobulate to pinnatifid, lobules denticulate; calyx parted to 1/3 |
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96 Primula sonchifolia |
| + |
Leaf blade erose-denticulate; calyx parted to middle |
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97 Primula whitei |
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| 21 (19) |
Leaf blade pinnately incised or lobed; calyx lobes entire or dentate |
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87 Primula chionata |
| + |
Leaf blade crenulate or dentate; calyx lobes entire. |
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(22) |
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| 22 (21) |
Plants farinose; pin flower style exserted from corolla tube |
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92 Primula calderiana |
| + |
Plants efarinose; pin flower style reaching upper 1/2 of corolla tube. |
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(23) |
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| 23 (22) |
Corolla exannulate, tube pilose inside |
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95 Primula tongolensis |
| + |
Corolla annulate, tube glabrous inside. |
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(24) |
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| 24 (23) |
Scapes with a solitary flower; corolla limb to 3.5 cm wide |
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93 Primula chamaedoron |
| + |
Scapes with 5-15 flowers; corolla limb 2-3 cm wide |
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94 Primula chamaethauma |
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| 25 (6) |
Corolla yellow. |
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(26) |
| + |
Corolla lilac or violet. |
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(29) |
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| 26 (25) |
Corolla lobes emarginate at apex |
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173 Primula calliantha |
| + |
Corolla lobes entire or crenate. |
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(27) |
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| 27 (26) |
Plants dwarf, scapes less than 10 cm; leaf blade linear-lanceolate, white farinose |
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175 Primula crocifolia |
| + |
Plants more robust, scapes to 20 cm; leaf blade not as above. |
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(28) |
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| 28 (27) |
Calyx lobes lanceolate to sublinear; corolla lobes with 4-6 teeth at apex |
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176 Primula elongata |
| + |
Calyx lobes elliptic to oblong-lanceolate or lanceolate; corolla lobes entire |
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177 Primula orbicularis |
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| 29 (25) |
Corolla lobes deeply emarginate at apex. |
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(30) |
| + |
Corolla lobes entire. |
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(33) |
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| 30 (29) |
Plants white farinose; calyx lobes lanceolate, apex acute. |
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(31) |
| + |
Plants yellow farinose; calyx lobes oblong, apex acute to subobtuse. |
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(32) |
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| 31 (30) |
Bracts leaflike; leaf blade lanceolate to oblanceolate, entire to denticulate |
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165 Primula macrophylla |
| + |
Bracts not leaflike; leaf blade elliptic tooblong-elliptic, distinctly denticulate |
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171 Primula farreriana |
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| 32 (30) |
Leaf blade lanceolate to linear-lanceolate, finely denticulate, apex acute to subobtuse; calyx lobes oblong-oblanceolate; capsules 1.5-3 cm |
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172 Primula megalocarpa |
| + |
Leaf blade narrowly ovate to obovate-oblong or oblanceolate, crenulate, apex rounded to obtuse; calyx lobes narrowly oblong; capsules 1-1.3 cm |
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173 Primula calliantha |
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| 33 (29) |
Leaves efarinose at anthesis. |
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(34) |
| + |
Leaves conspicuously farinose at anthesis. |
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(37) |
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| 34 (33) |
Leaf blade elliptic to oblong-ovate or oblong-lanceolate, ± regularly blunt denticulate |
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159 Primula nivalis |
| + |
Leaf blade lanceolate to oblanceolate, subentire or obscurely denticulate. |
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(35) |
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| 35 (34) |
Corolla limb 1-1.3 cm in diam., lobes puberulent on both sides |
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160 Primula melanantha |
| + |
Corolla limb 1.6-3 cm in diam., lobes glabrous. |
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(36) |
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| 36 (35) |
Corolla lobes lanceolate to narrowly oblong, paler in color than tube |
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161 Primula woodwardii |
| + |
Corolla lobes oblong, same color as or darker than tube |
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24 Populus purdomii |
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| 37 (33) |
Farina yellow. |
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(38) |
| + |
Farina white. |
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(41) |
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| 38 (37) |
Calyx parted to base, lobes lanceolate |
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168 Primula ninguida |
| + |
Calyx parted to 2/3, lobes narrowly oblong to lanceolate. |
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(39) |
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| 39 (38) |
Farina bright yellow; pin flower style or thrum flower stamens reaching mouth of corolla tube |
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169 Primula chionantha |
| + |
Farina pale yellow; pin flower style or thrum flower stamens reaching middle of corolla tube. |
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(40) |
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| 40 (39) |
Calyx lobes oblong to lanceolate, apex subacute; corolla lobes oblong-elliptic |
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170 Primula sinoplantaginea |
| + |
Calyx lobes lanceolate to oblong, apex subobtuse; corolla lobes suborbicular to obovate |
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165 Primula macrophylla |
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| 41 (37) |
Calyx parted to near middle. |
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(42) |
| + |
Calyx parted below middle. |
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(44) |
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| 42 (41) |
Leaf blade elliptic to oblong-ovate or oblong-lanceolate, ± regularly denticulate |
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159 Primula nivalis |
| + |
Leaf blade lanceolate to oblanceolate, entire or obscurely denticulate. |
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(43) |
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| 43 (42) |
Pin flower style or thrum flower stamens reaching mouth of corolla tube |
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163 Primula melanops |
| + |
Pin flower style or thrum flower stamens slightly longer than calyx |
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162 Primula purdomii |
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| 44 (41) |
Leaf blade linear, 2-4(-6) mm wide |
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164 Primula graminifolia |
| + |
Leaf blade not linear, at least 1 cm wide. |
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(45) |
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| 45 (44) |
Leaf blade lanceolate to oblanceolate, apex acute to obtuse; capsules longer than calyx |
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165 Primula macrophylla |
| + |
Leaf blade (at least of outer leaves) elliptic to oblong, apex subrounded; capsules ca. as long as calyx. |
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(46) |
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| 46 (45) |
Calyx parted to base, lobes spreading, lanceolate |
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166 Primula youngeriana |
| + |
Calyx parted to 2/3-3/4, lobes erect, oblong-lanceolate |
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167 Primula russeola |
