| 1 | Climbing plants with tendrils. |
| 1' | Erect shrubs or small trees. No tendrils. See Taxonomy and Key: The inclusion of Paropsia in Passifloraceae is supported by the systematic wood-anatomy according to R. B. MILLER (R. B. MILLERJ. Arn. Arb.56197595). |
| 2 | Androgynophore long; flowers bisexual; styles long, stigmas ± globular, smooth; anthers versatile. |
| 2' | Androgynophore 0 or short; flowers unisexual or polygamous; styles rather short, stigmas finely lobed or divided. |
| 3 | Corona 0 or consisting of fine hars; disk glands 5, Ungulate or strap-shaped; anthers narrow, erect, basifixed; flowers unisexual |
| 3' | Corona double: outer corona consisting of 2-3 rows of filaments, inner corona ('operculum') laciniate; disk 0 or as a faint annulus at bottom of hypanthium; anthers broad, deeply sagittate, versatile; flowers (functionally) polygamous |
