XVI International Botanical Congess
The Passifloraceae are traditionally subdivided into two tribes, the Passifloreae and the Paropsieae, which are clearly separated by their different habit. In contrast, flower morphology and development show many striking similarities. The nectar secreting tissue almost uniformly covers the inner wall of the receptacle, androgynophores occur throughout the family, an extrastaminal corona with a characteristic developmental pattern is usually present, solid styles and head shaped stigmas with a distinctive multicellular papillate surface are common in both tribes. However, the genus Adenia (Passifloreae) deviates from the rest of the Passifloraceae: the nectary is often composed of separate glands, the styles are not solid and the stigmas lack the characteristic differentiation of the papillae.