Table 2 Linear regression estimations between allele length means and average values of morphological measurements. Allele length means (independent variable) and average values of morphological measurements (dependent variable) for the following different groups of data points were subjected to linear regression analysis: all Hawaiian mint accessions, Phyllostegia accessions only, Stenogyne accessions only, and accessions representing the four different island groups, Hawai'i, Maui Nui, O'ahu, and Kaua'i. Maui Nui represents a single island complex now separated into Kaho'olawe, Lana'i, Maui, and Moloka'i. Significant P values (P < 0.05) are shown in bold. No adjustments for multiple tests were made (see Methods).

Nutlet size

all mints

84

0.114

-7.631

0.119

0.002

Phyllostegia

44

0.163

-8.599

0.123

0.007

Stenogyne

39

0.071

-6.436

0.113

0.101

Hawai'i

38

0.067

-2.826

0.072

0.116

Maui Nui

22

0.076

-7.873

0.117

0.215

O'ahu

12

0.472

-25.315

0.299

0.014

Kaua'i

12

0.182

-14.158

0.192

0.167

Corolla lower lip length

all mints

84

0.075

-12.792

0.187

0.011

Phyllostegia

42

0.116

-11.812

0.200

0.027

Stenogyne

41

0.028

-3.235

0.068

0.296

Hawai'i

38

0.122

-20.890

0.260

0.032

Maui Nui

22

0.240

-33.907

0.387

0.021

O'ahu

12

0.018

-1.197

0.085

0.679

Kaua'i

12

0.032

-1.871

0.093

0.581

Corolla upper lip length

all mints

85

0.073

-7.066

0.126

0.013

Phyllostegia

43

0.174

-11.960

0.161

0.005

Stenogyne

41

0.084

-6.907

0.138

0.066

Hawai'i

38

0.033

-1.027

0.070

0.278

Maui Nui

22

0.000

4.831

0.007

0.961

O'ahu

12

0.476

-44.477

0.504

0.013

Kaua'i

13

0.110

-7.375

0.129

0.269

Number of flowers per verticillaster

all mints

87

0.149

-14.690

0.215

0.000

Phyllostegia

44

0.199

-15.368

0.228

0.002

Stenogyne

42

0.064

-8.781

0.152

0.106

Hawai'i

38

0.127

-16.148

0.235

0.028

Maui Nui

22

0.150

-20.458

0.270

0.075

O'ahu

12

0.017

11.456

-0.051

0.683

Kaua'i

15

0.188

-6.556

0.124

0.107

Corolla tube length

all mints

86

0.005

6.368

0.082

0.518

Phyllostegia

44

0.013

5.794

0.051

0.464

Stenogyne

41

0.030

-10.470

0.287

0.279

Hawai'i

38

0.009

23.323

-0.080

0.563

Maui Nui

22

0.062

67.070

-0.510

0.264

O'ahu

12

0.520

-103.578

1.200

0.008

Kaua'i

14

0.281

-13.663

0.271

0.051

Corolla tube length^a

all mints

84

0.022

0.636

0.131

0.178

   excl. S. kamehamehae

Phyllostegia

44

0.013

5.794

0.051

0.464

Stenogyne

39

0.131

-24.717

0.413

0.024

Hawai'i

38

0.009

23.323

-0.080

0.563

Maui Nui

20

0.055

31.265

-0.189

0.322

O'ahu

12

0.520

-103.578

1.200

0.008

Kaua'i

14

0.281

-13.663

0.271

0.051

Corolla size

all mints

84

0.041

-2577.214

32.336

0.065

   (upper·lower·tube)

Phyllostegia

42

0.126

-3335.353

38.880

0.021

Stenogyne

41

0.016

-2130.259

28.476

0.433

Hawai'i

38

0.056

-2146.946

27.223

0.153

Maui Nui

22

0.003

-742.692

15.059

0.811

O'ahu

12

0.422

-12105.969

131.029

0.022

Kaua'i

12

0.258

-1528.194

20.864

0.092

Corolla size^a

all mints

82

0.117

-3499.719

40.347

0.002

   (upper·lower·tube)

Phyllostegia

42

0.126

-3335.353

38.880

0.021

   excl.S. kamehamehae

Stenogyne

39

0.140

-4311.797

47.821

0.019

Hawai'i

38

0.056

-2146.946

27.223

0.153

Maui Nui

20

0.304

-5915.636

61.546

0.012

O'ahu

12

0.422

-12105.969

131.029

0.022

Kaua'i

12

0.258

-1528.194

20.864

0.092

Pedicel length

all mints

87

0.042

-10.461

0.172

0.057

Phyllostegia

44

0.035

-10.391

0.178

0.223

Stenogyne

42

0.056

-5.625

0.118

0.132

Hawai'i

38

0.004

0.946

0.071

0.702

Maui Nui

22

0.121

-22.769

0.279

0.113

O'ahu

12

0.336

-20.582

0.277

0.048

Kaua'i

15

0.042

-2.592

0.084

0.464

Pedicel length^a

all mints

85

0.106

-12.258

0.183

0.002

   excl. P. warshaueri

Phyllostegia

42

0.125

-14.630

0.208

0.022

Stenogyne

42

0.056

-5.625

0.118

0.132

Hawai'i

36

0.089

-11.678

0.180

0.078

Maui Nui

22

0.121

-22.769

0.279

0.113

O'ahu

12

0.336

-20.582

0.277

0.048

Kaua'i

15

0.042

-2.592

0.084

0.464

Calyx length

all mints

87

0.004

4.339

0.041

0.538

Phyllostegia

44

0.082

-5.538

0.114

0.060

Stenogyne

42

0.000

11.554

-0.005

0.961

Hawai'i

38

0.002

6.140

0.026

0.771

Maui Nui

22

0.085

35.650

-0.269

0.189

O'ahu

12

0.451

-48.521

0.572

0.017

Kaua'i

15

0.004

5.393

0.031

0.826

Leaf area

all mints

87

0.002

87.498

-0.347

0.713

   (length*width)

Phyllostegia

44

0.021

210.761

-1.242

0.343

Stenogyne

42

0.015

-5.910

0.246

0.435

Hawai'i

38

0.017

-48.992

0.857

0.431

Maui Nui

22

0.058

-137.727

1.754

0.280

O'ahu

12

0.004

206.664

-1.083

0.852

Kaua'i

15

0.000

69.246

-0.079

0.961