Commelina, von Linne, 1753

Hassemer, Gustavo, Ferreira, João Paulo Ramos, Funez, Luís Adriano & Medeiros, João De Deus, 2016, Commelina catharinensis (Commelinaceae): a narrow endemic and endangered new species from Santa Catarina, southern Brazil, Phytotaxa 246 (1), pp. 49-60 : 56

Key to the species of Commelina in Santa Catarina state

1. Blades oval. Presence of underground cleistogamic flowers ................................................................................... C. benghalensis

- Blades lanceolate. Absence of underground cleistogamic flowers ................................................................................................... 2

2. Corolla composed of three developed petals ...................................................................................................................... C. diffusa

- Corolla composed of two developed dorsal petals and a reduced, inconspicuous ventral one ........................................................ 3

3. Central stamen with ellipsoid or auricle-shaped anther ................................................................................................................... 4

- Central stamen with sagittiform anther ............................................................................................................................................ 6

4. Leaves with base cuneate. Central stamen with fillet <3 mm long ......................................................................... C. vilavelhensis

- Leaves with base oblique. Central stamen with fillet> 3 mm long ................................................................................................. 5

5. Leaves with dense, villous indumentum ............................................................................................................................ C. villosa

- Leaves glabrous or glabrescent ......................................................................................................................................... C. obliqua

6. Blade margins green. Auricles present. Petals blue, purple or rarely white. Anther of lateral stamens whitish in the middle, lilac in the margins .......................................................................................................................................................................... C. erecta

- Blade margins vinaceous. Auricles absent. Petals cream-yellowish. Anther of lateral stamens yellow ................. C. catharinensis