Table 1. Summary of morphological variation of four species studied.

Characters	C. lanciloba	C. latilobula	C.planissima	C. yakusimensis
Sexuality*	autoicous	autoicous	autoicous	synoicous or paroicous
Oil body	5-12 per median cell	5-16 per median cell	5-11 per median cell	3-9 per median cell
Hyaline cells*	present throughout leaf margin	only on antical margin	only on antical margin	only on antical margin
Lobule*	narrowly ligulate or triangular-lanceolate with 1-2 additional teeth	usually ligulate (rarely triangular) without additional teeth at margin	mostly ovate or triangular with a tooth at proximal margin if lobule lanceolate or ligulate) and/or 2-3 teeth at apex of lobule if lobule ovate to triangular-ovate	usually ligulate (rarely triangular) without additional teeth at margin
Hyaline papilla	subapical (apical)	apical	proximal or apical	apical
Stylus	unicellular (1-2 celled occasionally)	1-celled	1-2 celled	unicellular
Cuticle	nearly smooth to finely punctate	punctate	nearly smooth to finely punctate	nearly smooth to finely punctate
Gemmae	24-30 celled	26-celled	26-38 celled	22-30 celled

^(*) represents key morphological characters commonly used for classification of these taxa. The literatures consulted for morphological data collection here included Mizutani [35], Tixier [36], Zhu & So [15] and Daniels, Kariyappa and Daniels [18].