| 1 |
Corolla 3-6 cm. |
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(2) |
| + |
Corolla 1.5-3.5 cm. |
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(9) |
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| 2 (1) |
Corollas almost white, pale yellow, or yellowish green, with dark blue spots and/or stripes. |
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(3) |
| + |
Corollas pale to dark blue (basal part of tube may be whitish or yellowish). |
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(4) |
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| 3 (2) |
Usually only lowermost axillary flowers with true pedicels or all flowers sessile above bracts; pedicels generally less than 1 cm |
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69 Gentiana algida |
| + |
All or most flowers distinctly pedicellate; basal pedicels often over 4 cm |
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73 Gentiana purdomii |
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| 4 (2) |
Calyx lobes 2-8.5 mm. |
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(5) |
| + |
Calyx lobes 1-2(-3) mm. |
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(6) |
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| 5 (4) |
Flowering stems ± decumbent, 3-10(-17) cm; flowers sessile or subsessile; stamens inserted at basal part of corolla tube |
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71 Gentiana nubigena |
| + |
Flowering stems erect, 15-35 cm; flowers pedicellate; stamens inserted near middle of corolla tube |
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74 Gentiana trichotoma |
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| 6 (4) |
Stems densely papillate; calyx tube not split |
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67 Gentiana striolata |
| + |
Stems glabrous to subglabrous; calyx tube split down 1 side or not. |
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(7) |
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| 7 (6) |
Upper stem leaves scarcely reduced; petiole of basal leaves 4-8 cm; calyx lobes straight |
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68 Gentiana omeiensis |
| + |
Upper stem leaves distinctly reduced; petiole of basal leaves 1-3 cm; calyx lobes spreading or reflexed. |
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(8) |
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| 8 (7) |
Basal leaves linear-lanceolate to linear-elliptic; corolla blue |
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59 Gentiana wilsonii |
| + |
Basal leaves oblong, narrowly elliptic, or oblanceolate; corolla dark blue |
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61 Gentiana atuntsiensis |
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| 9 (1) |
Corollas almost white, pale yellow, or yellowish green, with dark blue spots and/or stripes. |
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(10) |
| + |
Corollas pale to dark blue (basal part of tube may be yellowish or whitish). |
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(14) |
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| 10 (9) |
Flowers distinctly pedicellate; calyx lobes erect. |
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(11) |
| + |
Flowers sessile (axillary cymules may be pedunculate below bracts) or lowest axillary flowers rarely on pedicels to 1 cm; calyx lobes spreading or reflexed. |
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(12) |
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| 11 (10) |
Basal leaves oblong to spatulate; corolla obconic |
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72 Gentiana erectosepala |
| + |
Basal leaves linear, linear-elliptic, or rarely oblong; corolla tubular-campanulate to funnelform |
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73 Gentiana purdomii |
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| 12 (10) |
Stems papillate, most so toward apex |
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62 Gentiana handeliana |
| + |
Stems glabrous. |
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(13) |
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| 13 (12) |
Calyx tube split on 1 side, lobes 1-1.5 mm |
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63 Gentiana phyllopoda |
| + |
Calyx tube not split, lobes 3.5-5.5 mm |
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64 Gentiana apiata |
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| 14 (9) |
Flowers solitary; corolla 1.5-2 cm |
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70 Gentiana himalayaensis |
| + |
Flowers in narrow panicles, cymes, whorls, or clusters; corolla 2-3.5 cm. |
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(15) |
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| 15 (14) |
Flowers in cymes; gynophore 2.1-2.7 cm; calyx lobes 3-6 mm |
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75 Gentiana laxiflora |
| + |
Flowers in narrow panicles, whorls, or clusters; gynophore 0.8-2 cm; calyx lobes 1-3 mm. |
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(16) |
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| 16 (15) |
Flowers in narrow panicles; all but uppermost flowers consistently pedicellate |
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65 Gentiana microdonta |
| + |
Flowers in whorls or clusters; flowers sessile or lowest occasionally short pedicellate. |
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(17) |
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| 17 (16) |
Basal leaves oblong, narrowly elliptic, or oblanceolate; corolla dark blue. |
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(18) |
| + |
Basal leaves linear-lanceolate or linear-elliptic; corolla pale blue. |
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(19) |
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| 18 (17) |
Corolla tubular, lobes 1.5-2 mm |
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60 Gentiana subuliformis |
| + |
Corolla funnelform, lobes 3.5-5 mm |
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61 Gentiana atuntsiensis |
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| 19 (17) |
Calyx lobes straight |
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66 Gentiana wasenensis |
| + |
Calyx lobes spreading to reflexed |
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59 Gentiana wilsonii |
