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| 1 |
Plicae margin fringed. |
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(2) |
| + |
Plicae margin erose, denticulate, or short laciniate. |
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(4) |
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| 2 (1) |
Annuals; calyx tube with broad wings; corolla 2.3-2.5 cm |
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107 Gentiana alata |
| + |
Perennials; calyx tube with narrow wings or merely sharply ridged along veins; corolla 2.5-4.5 cm. |
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(3) |
| |
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| 3 (2) |
Stems, leaves, and calyces densely white and purple pilose; calyx tube prominently veined but not winged |
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106 Gentiana villifera |
| + |
Plant glabrous or puberulent on petioles and leaf veins only; calyx tube narrowly winged |
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108 Gentiana rhodantha |
| |
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|
|
| 4 (1) |
Corolla yellow, greenish yellow, or yellowish white. |
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(5) |
| + |
Corolla pale to dark blue, violet, or purple. |
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(6) |
| |
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| 5 (4) |
Corolla tube outside puberulent along veins, sometimes purple suffused but not distinctly striped; lobes slightly acuminate to subacute; plicae horizontally truncate, margin erose; stamens inserted near base of corolla tube |
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110 Gentiana souliei |
| + |
Corolla tube glabrous, distinctly dark striped; lobes long acuminate to caudate; plicate obliquely truncate, margin denticulate; stamens inserted at middle of corolla tube |
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109 Gentiana striata |
| |
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| 6 (4) |
Calyx tube angled, sometimes with slightly rough sharp ridges but without conspicuous wings. |
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(7) |
| + |
Calyx tube conspicuously winged. |
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(9) |
| |
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|
|
| 7 (6) |
Corolla blue, 2.5-3.2 cm, tubular to funnelform; limb to 12 mm wide |
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111 Gentiana leptoclada |
| + |
Corolla violet to purple, 1-2 cm, salverform; limb 7-10 mm wide. |
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(8) |
| |
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|
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| 8 (7) |
Calyx lobes subulate; plicae triangular, 2.5-3 mm, margin erose |
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112 Gentiana primuliflora |
| + |
Calyx lobes narrowly ovate to triangular; plicae lanceolate, 4-6 mm, margin denticulate |
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113 Gentiana expansa |
| |
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|
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| 9 (6) |
Corolla 3-4.5 cm; calyx lobes narrowly elliptic, lanceolate, or ovate-lanceolate, base narrowed. |
|
(10) |
| + |
Corolla 2.2-3 cm; calyx lobes linear to subulate, base not narrowed. |
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(11) |
| |
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|
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| 10 (9) |
Leaf blade 1.3-2.5 cm; internodes 3-8 cm; calyx tube broadly winged; corolla lobes obtuse; seeds broadly winged |
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114 Gentiana pterocalyx |
| + |
Leaf blade 0.7-1.2 cm; internodes 1-2.5 cm; calyx tube narrowly winged; corolla lobes acuminate; seeds narrowly winged or wingless |
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115 Gentiana eurycolpa |
| |
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| 11 (9) |
Leaves toward stem apex adaxially hispidulous on veins; plicae margin erose; ovary gynophore 8-10 mm |
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116 Gentiana gentilis |
| + |
Leaves all adaxially glabrous; plicae margin denticulate; ovary gynophore 5-7 mm |
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117 Gentiana serra |
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