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| 1 |
Corolla lobes distinctly shorter than tube. |
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(2) |
| + |
Corolla lobes about as long as or longer than tube. |
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(4) |
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| 2 (1) |
Basal rosettes present at flowering time, with leaves almost 3 × as long as larger stem leaves; stem leaves 3-5 pairs, 7-11 mm; corolla 1.7-2.2 cm; seed coat alveolate |
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5 Gentiana doxiongshangensis |
| + |
Basal rosettes absent or poorly developed, with leaves only slightly larger than stem leaves; stem leaves numerous, 1.5-4 mm; corolla (0.4-)0.7-1.5 cm; seed coat minutely reticulate. |
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(3) |
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| 3 (2) |
Stem leaf blades 3.5-4 mm; calyx tube 5-6 mm, lobes 3-3.5 mm; corolla white or pale yellow-white; plicae triangular, 2-2.5 mm |
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2 Gentiana leucantha |
| + |
Stem leaf blades 1.5-3 mm; calyx tube 2-2.5 mm, lobes 1.8-2.2 mm; corolla dark blue; plicae auricular, 0.3-0.5 mm |
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4 Gentiana infelix |
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| 4 (1) |
Basal rosettes absent at flowering time or poorly developed, with leaves no larger than those of flowering stems; stem leaves numerous; corolla blue or blue-purple, rarely yellow. |
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(5) |
| + |
Basal rosettes well developed at flowering time, larger rosette leaves usually more than twice as long as leaves of flowering stems; stem leaves 2-5 pairs; corolla white or pale yellow with pale blue streaks and/or spots. |
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(6) |
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| 5 (4) |
Apex of leaf blades and calyx lobes acuminate, with an aristate tip to 1 mm |
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1 Gentiana caryophyllea |
| + |
Apex of leaf blades and calyx lobes acute to obtuse, without an aristate tip |
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3 Gentiana decorata |
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| 6 (4) |
Basal leaf blades 5-12 × (0.8-)1-2.5 cm; flowers usually in axillary or terminal cymes, occasionally solitary |
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7 Gentiana otophora |
| + |
Basal leaf blades 1-5 × 0.2-1.2 cm; flowers usually solitary, rarely in cymes of 2 or 3 in G. sichitoensis. |
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(7) |
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| 7 (6) |
Corolla 2.5-3 cm, lobes about as long as tube |
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8 Gentiana otophoroides |
| + |
Corolla 1.6-2 cm, lobes distinctly longer than tube. |
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(8) |
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| 8 (7) |
Basal leaf blades linear to oblanceolate, 2-4 mm wide; stem leaf blades linear-lanceolate to ovate-lanceolate, 2-3 mm wide |
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6 Gentiana damyonensis |
| + |
Basal leaf blades spatulate to oblong-spatulate, 7-12 mm wide; stem leaf blades ovate to suborbicular, 6-8 mm wide |
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9 Gentiana sichitoensis |
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