Leaves opposite or whorled, and with stipules. [Rubiaceæ], [222]
Leaves opposite without stipules (petioles sometimes with stipule-like appendages). [Caprifoliaceæ], [216]
2. Ovary free from the calyx (superior).
[*] Corolla irregular; stamens (with anthers) 4 and didynamous, or only 2.
Ovules and seeds solitary in the (1–4) cells.
Ovary 4-lobed, the style rising from between the lobes. [Labiatæ], [403]
Ovary not lobed, the style from its apex. [Verbenaceæ], [401]
Ovules numerous or at least as many as 2 in each cell.
Ovary and pod 1-celled,
With a free central placenta; stamens 2. [Lentibulaceæ], [395]