Leucas songeana Sebald

Meerts, Pierre, 2022, New identifications of Lamiaceae (Lamioideae and Scutellarioideae) from D. R. Congo, Rwanda and Burundi, Bothalia (a 9) 52 (1), pp. 1-7 : 4

publication ID	https://doi.org/ 10.38201/btha.abc.v52.i1.9
persistent identifier	https://treatment.plazi.org/id/A352084C-7932-FF97-FCBD-1DCEFAA69AAC
treatment provided by	Felipe
scientific name	Leucas songeana Sebald
status

Treatment

* Leucas songeana Sebald View in CoL

Distribution: Angola, D.R. Congo, Malawi, Tanzania, Zambia, Zimbabwe.

Habitat: Miombo woodlands; alt. ± 1300 m in D. R. Congo, alt. 1150–1900 m elsewhere .

Specimens examined: D. R. CONGO: Haut-Katanga: Mont Mukuen , 10 km SE d’E’ville [Lubumbashi], 11°46’S, 27°27’E, alt. 1300 m, petite gorge à sol plus profond et frais, 25 Jun. 1948, Schmitz 1704 GoogleMaps (BR).

Discussion: The species is closely related to the widespread Leucas martinicensis (Jacq.) R.Br. , from which it differs by the median lobe of the posterior lip of the calyx, which is hardly longer than the other lobes (vs. much longer and erect in L. martinicensis ), and the calyx tube only weakly curved (vs. strongly sigmoid in L. martinicensis ). The single collection from D.R. Congo is located in the south of Lubumbashi, in a region that has been subjected to strong urbanization pressure in the last decades.

Bibliography: Sebald (1980), Paton et al. (2009, 2013), Vollesen & Merrett (2020).