Natural hybridization and asymmetric introgression at the distribution margin of two Buddleja species with a large overlap

Table 1 Morphological traits used to distinguish B. officinalis, B. crispa and their putative hybrid

Character	B. officinalis	B. crispa	Putative hybrid	F	Welch	P value
Leaf shape	Narrowly ovate	Ovate	Ovate-elliptic
Leaf margin	Entire	Crenate	Sinuate
Adaxial leaf surface indumentum	Glabrescent	Densely tomentose	Puberulent
Leaf base including petiole	Cuneate, free	Auriculate, winged	Cuneate to decurrent
Corolla color	Yellow-white	Lilac to purple	Lilac
L (cm)	13.35 ± 1.69	13.54 ± 2.41	13.89 ± 1.90	0.563		0.572
W (cm)	4.99 ± 0.73^a	7.35 ± 1.36^b	6.85 ± 1.07^b		51.236	<0.001
L/W	2.70 ± 0.36^a	1.86 ± 0.30^b	2.04 ± 0.14^c		52.207	<0.001

mean ± standard deviation are shown for the three traits
L leaf length, W leaf width, L/W ratio of leaf length to leaf width
^{a, b, c}:the means with different superscripts are significantly different from each other at the 0.05 level and based on Tamhane’s T2 test

ISSN: 1471-2229