Lippia

Cardoso, Pedro Henrique, Neto, Luiz Menini, Trovó, Marcelo & Salimena, Fátima Regina Gonçalves, 2021, Checklist and a new species of Lippia (Verbenaceae) from the Diamantina Plateau, Minas Gerais, Brazil, European Journal of Taxonomy 733, pp. 42-55 : 47-48

Identification key to the species of Lippia L. from the Diamantina Plateau, Minas Gerais, Brazil

1. Inflorescences more than 2 per leaf axil; bracts tetrastichous, the basal ones connate ..................... 2

– Inflorescence 1 per leaf axil; bracts spiraled, all free ....................................................................... 3

2. Plants with frondose-bracteaose inflorescences ................................................ L. stachyoides Cham.

– Plants with frondose inflorescences .................................................................. L. origanoides Kunth

3. Calyx laterally flattened, 2-winged. ......................... L. rubella (Moldenke) T.R.S.Silva & Salimena

– Calyx tubular-cylindric, not winged. ................................................................................................ 4

4. Leaves with hyphodromous venation; corolla yellow ............................ L. filifolia Mart. & Schauer

– Leaves with pinnate venation; corolla pink, lilac, rarely white ........................................................ 5

5. Bracts membranous, pink to magenta, rarely green at base and vinaceous at apex, longer than the corolla tube ....................................................................................................................................... 6

– Bracts foliaceous, green, rarely vinaceous at apex, shorter than the corolla tube .......................... 10

6. Leaf-blades abaxially densely pubescent with pedunculate glandular trichomes; bracts green at base, vinaceous at apex ........................................................................ L. pseudothea (A.St.-Hil.) Schauer

– Leaf-blades abaxially lacking pedunculate glandular trichomes; bracts pink to magenta ............... 7

7. Leaves ovate-deltoid to suborbicular, margin dentate-lobate ........... L. hederifolia Mart. & Schauer

– Leaves ovate, broadly ovate or elliptic, margin crenate ................................................................... 8

8. Branches densely velutinous, pedunculate glandular trichomes present; leaves ovate-elliptic to oblong-elliptic ................................................................................ L. rhodocnemis Mart. & Schauer

– Branches hirsute or pubescent, pedunculate glandular trichomes absent; leaves ovate to broadly ovate .................................................................................................................................................. 9

9. Branches and peduncles pubescent; inflorescences hemispheric or cylindric .................................... ................................................................................................ L. diamantinensis Glaz. ex Moldenke

– Branches and peduncles hirsute; inflorescences globose ...................................... L. lupulina Cham.

10. Corymbs axillary, densely congested at the apex of the branches ...................................................11

– Spikes axillary, not congested at the apex of the branches ............................................................. 13

11. Leaf-blades abaxially hirsute, adaxially bullate; bracts elliptic, apex reflexed .................................. ............................................................................................................................ L. corymbosa Cham.

– Leaf-blades abaxially tomentose, adaxially slightly bullate; bracts ovate-lanceolate, apex straight. ......................................................................................................................................................... 12

12. Leaves ovate, base cordate .................................................................. L. lacunosa Mart. & Schauer

– Leaves ovate-orbicular or orbicular, base obtuse to cuneate ........................... L. rotundifolia Cham.

13. Leaves congested at the apex of the branch, with few tector trichomes; drupe with 2 pyrenes ......... .................................................................................... L. raoniana P.H.Cardoso & Salimena sp. nov.

– Leaves evenly distributed along the branch, with several tector trichomes; schizocarp with 2 cluses ............................................................................................................................................... 14

14. Leaves obovate to suborbicular; inflorescences few-flowered ................... L. hermannioides Cham.

– Leaves ovate to ovate-elliptic; inflorescences many-flowered ....................................................... 15

15. Branches sulcate, nodes conspicuous; bracts elliptic ................................... L. subracemosa Mansf.

– Branches not sulcate, nodes inconspicuous; bracts ovate or lanceolate ......................................... 16

16. Branches villous-sericeous; leaves ovate-deltate, abaxially villous-sericeous; bracts lanceolate ...... ...................................................................... L. krenakiana P.H.Cardoso, V.I.R.Valério & Salimena

– Branches strigose; leaves elliptic to ovate-elliptic, adaxially strigose; bracts broadly ovate ............. ............................................................................................................................. L. rosella Moldenke