Table 3 Codon usage of the Subtribe Swertiinae species. T3s/C3s/A3s/G3s/GC3s represents the thymine/cytosine/adenine/guanine/ GC content at synonymous third codon position, GC notes the total GC content, CAI represents codon adaptation index, ENc represents effective number of codons

Comastoma falcatum

0.4124

0.2578

0.3724

0.238

0.163

53.67

0.377

0.397

Comastoma pulmonarium

0.4122

0.2586

0.3700

0.2395

0.163

53.77

0.379

0.398

Gentianopsis barbata

0.4104

0.2581

0.3742

0.2384

0.162

53.79

0.377

0.396

Gentianopsis grandis

0.4581

0.1773

0.4242

0.1892

0.163

50.70

0.281

0.384

Gentianopsis paludosa

0.4113

0.2578

0.3740

0.2383

0.162

53.73

0.377

0.396

Lomatogoniopsis alpina

0.4124

0.2579

0.3728

0.2391

0.164

53.70

0.377

0.396

Lomatogonium perenne

0.4123

0.2577

0.3728

0.2389

0.164

53.70

0.377

0.396

Pterygocalyx volubilis

0.4128

0.2573

0.3732

0.237

0.163

53.76

0.376

0.396

Veratrilla baillonii

0.4081

0.2583

0.3751

0.2382

0.163

53.90

0.378

0.399

Halenia coreana

0.4107

0.26

0.3634

0.2402

0.161

53.94

0.382

0.402

Halenia elliptica

0.4109

0.2582

0.3727

0.237

0.162

53.73

0.377

0.397

Swertia bifolia

0.4107

0.2595

0.3734

0.2368

0.164

53.79

0.377

0.397

Swertia bimaculata

0.4114

0.2585

0.3735

0.2373

0.163

53.71

0.377

0.397

Swertia cincta

0.4113

0.259

0.3721

0.2391

0.163

53.76

0.378

0.397

Swertia cordata

0.4117

0.2586

0.3728

0.2367

0.163

53.78

0.377

0.397

Swertia dichotoma

0.4108

0.2584

0.3738

0.2371

0.162

53.80

0.377

0.397

Swertia dilatata

0.4115

0.2586

0.3722

0.2386

0.163

53.78

0.378

0.397

Swertia diluta

0.4097

0.2605

0.3633

0.2418

0.162

54.00

0.383

0.403

Swertia erythrosticta

0.4110

0.2589

0.3737

0.2368

0.163

53.81

0.377

0.396

Swertia franchetiana

0.4557

0.1778

0.4231

0.1884

0.162

50.62

0.282

0.387

Swertia hispidicalyx

0.4115

0.2591

0.372

0.2382

0.163

53.77

0.378

0.397

Swertia kouitchensis

0.4107

0.259

0.372

0.2382

0.163

53.85

0.378

0.398

Swertia leducii

0.4109

0.2588

0.3732

0.2373

0.163

53.84

0.377

0.397

Swertia macrosperma

0.4103

0.2603

0.3714

0.2372

0.163

53.82

0.379

0.398

Swertia multicaulis

0.4109

0.2579

0.3724

0.2391

0.162

53.81

0.378

0.397

Swertia mussotii

0.4111

0.2597

0.3711

0.2373

0.163

53.85

0.378

0.398

Swertia nervosa

0.4101

0.2592

0.3728

0.2381

0.163

53.78

0.378

0.397

Swertia przewalskii

0.4107

0.2591

0.3733

0.2373

0.163

53.78

0.377

0.397

Swertia pubescens

0.4118

0.2596

0.3716

0.2391

0.164

53.77

0.378

0.397

Swertia punicea

0.4108

0.2589

0.3722

0.2382

0.164

53.86

0.378

0.398

Swertia souliei

0.4097

0.2605

0.3664

0.2396

0.162

53.89

0.381

0.401

Swertia tetraptera

0.3115

0.2644

0.3721

0.3384

0.149

57.76

0.451

0.410

Swertia verticillifolia

0.4570

0.1781

0.4229

0.1894

0.162

50.77

0.282

0.385

Swertia wolfgangiana

0.4111

0.2588

0.3736

0.2369

0.163

53.79

0.377

0.396

Mean

0.4122

0.2518

0.3765

0.2368

0.162

53.64

0.372

0.397