| Plant | Mature foliage | Flower | Ripe fruit |
| P. alata - quite like P. quadrangularis but smaller flowers. A very variable species. | 2-4 petiole glands per stem. Stipules 1-2cm long by 0.3-1cm wide. Single lobed ovate leaves. | Flowers 10-12cm wide with neat corona filaments. Sepals and petals red inside & green out. | Fruit ovoid, 10-15cm long by 5-10cm wide, bright orange or yellow when ripe. |
| P. x decaisneana - (P. alata x P. quadrangularis) often mislabelled and sold as P. quadrangularis.) | 4 glands on 90% of the stems. Stipules 15mm long by 6mm wide. Large ovate leaves. | Heavier flowers 10-13cm, corona filaments a bit scruffy at the end compared with alata. Sepals and petals red inside & sepals green out & petals red out. | Fruit egg shaped up to 18cm long, dull orange when ripe. |
| P. phoenicea. Often known as P. alata 'Ruby Glow'. Will not set fruit with caerulea. All the others listed here will. | 2 bright yellow petiole glands very near the leaf make ID easy. Stipules 10-12mm long by 3-4mm wide. Large ovate leaves. | Flowers 11-13cm. Petals brick red outside & rich purple inside. Neat corona filaments. Sepals shorter than petals. | Fruit large ovate, up to 13cm long & 8cm diameter, yellow when ripe. |
P. quadrangularis. | 6 glands on 90% of the leaf stems. Stipules 2-3.5cm long by 1-2cm wide. Large ovate leaves. | Flowers 8-12cm. Very scruffy corona filaments, sepals a little paler than petals inside. | Fruit quadrangular (four sided), 20-30 cm long by 10-20 cm wide, pale yellow-green when ripe. |
Passiflora alata Key
