Phyllanthus sect. Phyllanthus subsect. Phyllanthus

Torres, Alícia Marques & Silva, Marcos José Da, 2024, Reinstatement and lectotypification of Phyllanthus rosellus (Phyllanthaceae), an endemic species from the state of Minas Gerais, Brazil, Phytotaxa 645 (3), pp. 259-269 : 266

Key to the species of Phyllanthus sect. Phyllanthus subsect. Phyllanthus

1. Leaves with 13 to 16 pairs of secondary veins; staminate flowers solitary ...................................................................... P. capixaba

- Leaves with 4 to 9 pairs of secondary veins; staminate flowers in cymules or cincinii.....................................................................2

2. Branchlets arranged only at the apex of the main stem......................................................................................................................3

- Branchlets arranged along the main stem...........................................................................................................................................4

3. Branches pubescent; leaves oblong-falcate, chartaceous; dorsoventrally flattened stigmas................................ P. longipedicellatus

- Branchlets glabrous; leaves oblong, membranaceous; capitate stigmas .................................................................. P. itamarajuensis

4. Petiole 1.4–1.9 mm long; staminate disk with smooth surface ................................................................................ P. longipetiolatus

- Petiole up to 1.2 mm long; staminate disk with verruculose surface .................................................................................................5

5. Leaves with an asymmetrical-obtuse base; 3–5-lobed pistillate disk................................................................................... P. lobatus

- Leaves with an asymmetrical-cordate or asymmetrical-rounded base; entire pistillate disk .............................................................6

6. Stamens fully united in a column ................................................................................................................................... P. perpusillus

- Stamens free or united up to half the length of the filaments.............................................................................................................7

7. Branchlets unisexual; leaves with 4–5 pairs of secondary veins; staminate flowers present in the proximal and distal regions of the branches............................................................................................................................................................................... P. rosellus

- Branchlets bisexual; leaves with 6–9 pairs of secondary veins; staminate flowers present only in the proximal region of the branches..............................................................................................................................................................................................8

8. Leaves 21–41 mm long; pedicel of pistillate flowers 20–30 mm long ............................................................................ P. augustinii

- Leaves 5–17 mm long; pedicel of pistillate flowers 3–18 mm long ..................................................................................................9

9. Pistillate flowers pedicels 12–18 mm long; styles 2.2–2.8 mm long; punctiform stigmas ............................................ P. megastylus

- Pistillate flower pedicels 3–8 mm long; styles 0.7–1.5 mm long; capitate or dorsoventrally flattened stigmas ...............................9

10. Staminate flower pedicels 6–7 mm long and pistillate 7–8 mm long; bilobed styles with flat stigmas ....................... P. platystigma

- Staminate flower pedicels 2–4 mm long and pistillate 3–5 mm long; bifid styles with capitate stigmas.............................. P. niruri