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Table 1 Morphological traits used to distinguish between B. alternifolia, B. crispa and B. × wardii

From: Natural hybridization between two butterfly bushes in Tibet: dominance of F1 hybrids promotes strong reproductive isolation

Characters

B. alternifolia

B. × wardii

B. crispa

F

Welch

P value

L (mm)

16.00 ± 3.15a

27.31 ± 10.02b

64.65 ± 25.47c

 

62.971

< 0.001

W (mm)

3.62 ± 0.66a

14.00 ± 3.26b

36.61 ± 11.72c

 

235.112

< 0.001

L/W

4.52 ± 0.99a

1.94 ± 0.47b

1.76 ± 0.31b

 

97.410

< 0.001

TL (mm)

7.10 ± 0.80a

9.77 ± 1.04b

10.25 ± 1.51b

 

79.584

0.017

TW (mm)

0.93 ± 0.17a

1.09 ± 0.15b

1.20 ± 0.18c

17.584

 

0.641

CLL (mm)

1.43 ± 0.27a

2.29 ± 0.37b

2.17 ± 0.40b

49.695

 

0.073

CLW (mm)

1.60 ± 0.20a

2.41 ± 0.35b

2.45 ± 0.46b

 

80.282

0.004

AH (mm)

5.22 ± 0.76a

5.97 ± 0.93b

6.66 ± 0.96c

18.266

 

0.539

SL (mm)

2.89 ± 0.47a

4.14 ± 0.91b

4.41 ± 1.05b

 

46.621

0.001

HE (mm)

1.08 ± 0.67

0.75 ± 0.72

0.95 ± 0.87

1.261

 

0.588

  1. 1 L leaf length, W leaf width, L/W ratio of leaf length to leaf width, TL corolla tube length, TW corolla tube width, CLL corolla lobe length, CLW corolla lobe width, AH anther height, SL style length, HE herkogamy