Viola
Erben, M. 1985: Cytotaxonomische Untersuchungen an südosteuropäischen Viola-Arten der Sektion Melanium. – Mitt. Bot. Staatssamml. München 21: 339-740Meikle, R.D. 1977: Flora of Cyprus 1 but supplemented and accepted names differing.
The key needs further testing, especially regarding the last two species and their characters.
| 1 | Perennial species; leaves cordate |
| 1' | Annuals; leaves not cordate |
| 2 | Sepals acute; plant glabrous; flowers scentless; stipules not membranous |
| 2' | Sepals obtuse; plants more or less pubescent; flowers scented; stipules membranous |
| 3 | Stipules ovate or ovate-lanceolate, shortly glandular-fimbriate; stolons rooting at tip |
| 3' | Stipules linear-lanceolate with long-ciliate margins; stolons not (or tardily) rooting at tip |
| 4 | Stipules with foliaceous mid-lobe and several palmately arranged lateral lobes; leaves usually crenate-serrate |
| 4' | Stipules not foliaceous, with a few irregular lateral lobes or none |
| 5 | Sepals ovate; mid-lobe of stipule not stipitate; plant usually distinctly villose, hairs 0.5-2 mm long |
| 5' | Sepals narrowly oblong; mid-lobe of stipule usually with a slender stipe; plant subglabrous or sparsely puberulous, hairs 0.3-0.8 mm long |
| 6 | Flowers with yellowish and white parts; stipules entire |
| 6' | Flowers predominantly with lilac-blue parts; stipules with 1-2 small teeth |
