Melastomataceae

Silva-Gonçalves, Kelly Cristina Da, Baumgratz, José Fernando A. & Nunes-Freitas, André Felippe, 2014, Melastomataceae in a continental Atlantic Forest island from southeastern Brazil, Phytotaxa 183 (2), pp. 61-92 : 64-65

Key to species of Melastomataceae on Marambaia

1. Ovary free inside the hypanthium or adnate to the hypanthium only at the base or by septa along the length, and free to the apex; fruit capsule (capsule loculicidal, ruptidium or velatidium) .............................................................................................................2.

- Ovary partial or completely inferior; fruit berry (baccaceous or bacidium) ................................................................................... 9.

2. Flower solitary, axillary; connective appendage thickened, and involving the base of the thecae; fruit capsule loculicidal ............. ................................................................................................................................................................................ Marcetia taxifolia

- Inflorescences terminal; connective appendage ventral or dorsal, not thickened nor involving the base of the thecae; fruit ruptidium or velatidium .................................................................................................................................................................................... 3.

3. Leaves apparently glabrous, the indumentum glandular-punctate (trichomes inconspicuous); flower 4-merous; petals white and basally yellow; anthers yellow, and dorsally appendaged; ovary glabrous; seeds winged, linear to oblong ....... Huberia ovalifolia

- Leaves sharply pilose, the indumentum of other types, no glandular-punctate; flower 5-merous; petals purple or lilac; anthers purple, lilac or rose-purple, and ventrally appendaged; ovary pilose; seeds not winged, cochlear ( Tibouchina ) ........................... 4.

4. Branches slightly to sharply winged; filaments 1/2–2/3-superior glandular-villous ....................................................................... 5.

- Branches not winged; filaments basally glandular or glandular-pubescent, not villous ................................................................. 6.

5. Leaves with adaxial surface bullate and abaxial surface foveolate, the adaxial surface with strigose and strigulose trichomes basally many-branched, ............................................................................................................................................. Tibouchina estrellensis

- Leaves with both surface plane, the adaxial surface with strigose and strigulose trichomes basally 1-2-branched ........................... ......................................................................................................................................................................... Tibouchina granulosa

6. Capsule ruptidium type .................................................................................................................................................................... 7.

- Capsule velatidium type .................................................................................................................................................................. 8.

7. Leaf base obtuse to acute; hypanthium 5–11 mm long; anthers 11–17 mm long ................................. Tibouchina gaudichaudiana

- Leaf base obtuse-cordate; hypanthium 3–5 mm long; anthers 4–6 mm long. .............................................. Tibouchina heteromalla

8. Leaves with the adaxial surface with trichomes basally not thickened nor branched, the acrodromous marginal veins suprabasal; bracteoles 6.2–7.8 mm long; connective of antesepalous stamens 1,8– 2 mm prolonged bellow the thecae ...................................... ........................................................................................................................................................................ Tibouchina corymbosa

- Leaves with the adaxial surface with trichomes basally thickened and 1-2-branched, the acrodromous marginal veins basal; bracteoles 12–13 mm long; connective of antesepalous stamens 3.8–4 mm prolonged bellow the thecae ........................................ ........................................................................................................................................................................ Tibouchina trichopoda

9. Inflorescences axillary and/or pseudo-axillary, sometimes also terminal ..................................................................................... 10.

- Inflorescences terminal .................................................................................................................................................................. 12.

10. Floral buds and petals apex acute to acuminate ................................................................................................... Ossaea marginata

- Floral buds apex obtuse to rounded; petals apex rounded to rounded-emarginate ( Clidemia ) … ................................................ 11.

11. Branches and abaxial surface of leaf blades with furfuraceous-stellulate trichomes; inner torus with an irregularly toothedfimbriated membranaceous ring; calyx internal lobes slightly denticulate or reduced to a membranaceous and sinuos ring ............ ...................................................................................................................................................................................... Clidemia hirta

- Branches and abaxial surface of leaf blades with stellate trichomes sharply pedicelate, not furfuraceous trichomes; inner torus sparsely glandular, sometimes glabrous; calyx internal lobes wide-ovate, apex rounded to truncate-emarginate ............................. .............................................................................................................................................................................. Clidemia urceolata

12. Floral buds and petals apex acute to acuminate ( Leandra ) ........................................................................................................... 13.

- Floral buds apex obtuse to rounded ( Miconia ) .............................................................................................................................. 16.

13. Thyrsoids of scorpioid cymes; anthers yellow ........................................................................................................ Leandra reversa

- Thyrsoids with no branchlets of scorpyoid cymes; anthers white or white-rosy .......................................................................... 14.

14. Bracts and bracteoles involucral, broadly ovate, apex rounded .................................................................. Leandra melastomoides

- Bracts and bracteoles not involucral, triangular, apex acuminate ................................................................................................. 15.

15. Plants apparently glabrous, indumentum furfuraceous-stellulate, trichomes early-caducous; leaves domatia primary-axillary hairtuft in abaxial surface .......................................................................................................................................... Leandra acutiflora

- Plants sharply pilose, indumentum with dendritic and rough-setulose trichomes, persistent; leaves domatia absent ........................ ............................................................................................................................................................................... Leandra variabilis

16. Adults leaves sharply discolour, adaxial surface green, abaxial surface brownish, white-brownish and/or rufous, indumentum persistent, and covering densely and all the epidermic surface, sometimes moderate and partially ............................................ 17.

- Adults leaves green, concolour, subconcolour or discolour, abaxial surface glabrous or indumentum generally sparse, sometimes dense and covering partially the epidermic surface, trichomes persistent or caducous ................................................................ 22.

17. Inflorescences of scorpioid cymes ................................................................................................................................................. 18.

- Inflorescences with no branchlets of scorpioid cymes .................................................................................................................. 19.

18. Shrubs, sometimes treelets (2–4.5 m tall); indumentum of the leaves abaxial surface densely lanate, trichomes vermiform; thyrses pyramidal; fruit bacidium ....................................................................................................................................... Miconia albicans

- Trees (9–17 m tall); indumentum of the leaves abaxial surface lepidote-stellate; thyrses oblong; fruit baccaceous .......................... .................................................................................................................................................................................. Miconia lepidota

19. Branches indumentum with stellate and dendritic trichomes, no lepidote trichomes; calyx persistent; anthers yellow, becoming reddish to vinaceous, connective appendage latero-ventrally 2-lobed; fruit bacidium .................................... Miconia dodecandra

- Branches indumentum lepidote-stellate or tomentosous-stellate, no dendritic trichomes; calyx caducous; anthers white, connective inappendaged or dorsal appendage calcarate; fruit baccaceous .................................................................................................... 20.

20. Thyrsoids of glomerules ...................................................................................................................................... Miconia chartacea

- Thyrsoids with no branchlets of glomerules ................................................................................................................................. 21.

21. Leaf blade abaxial surface dense and completely covered by the indumentum, the epidermic surface not exposed; inner torus lepidote-stellate; ovary apex with stellulate trichomes .................................................................................. Miconia cubatanensis

- Leaf blade abaxial surface moderate and partially covered by the indumentum, epidermic surface partially exposed; inner torus glabrous; ovary apex glabrous ........................................................................................................................... Miconia brasiliensis

22. Branches nodes with interpetiolar pseudo-stipules, latelly caducous ......................................................... Miconia cinnamomifolia

- Branches nodes without interpetiolar pseudo-stipules .................................................................................................................. 23.

23. Petioles 2.6–7.4 cm long; leaf blades 9.1–18 cm wide, base obtuse to rounded or subcordate; thyrsoids of glomerules .................. ............................................................................................................................................................................. Miconia calvescens

- Petioles 0.5–2.4 cm long; leaf blades 1.9–8.7 cm wide, base acute, acute-decurrent or obtuse-cuneate; thyrsoids with no branchlets of glomerules ................................................................................................................................................................................. 24.

24. Leaf blade base acute; bracts and bracteoles caducous; calyx caducous; anthers pore ventral, very wide, and prolonged to the base as a longitudinal slit; fruit oligospermous (2–6 seeds) ....................................................................................... Miconia pusilliflora

- Leaf blade base acute-decurrent or rounded-cuneate; bracts and bracteoles persistent; calyx persistent; anthers pore terminal, not prolonged to the base; fruit polyspermous (50–80 seeds) ....................................................................................... Miconia prasina