Nothodissotis (Melastomataceae), a new genus from Atlantic Central Africa, including the new species N. alenensis from Equatorial Guinea

Abstract

Based on morphological and phylogenetic evidence, a new genus of Melastomataceae (Melastomateae), Nothodissotis Veranso-Libalah & G.Kadereit, gen. nov., is described from Atlantic Central Africa. Nothodissotis is distinguished from other African Melastomateae genera by its calyx-lobes that are notched at apex and asymmetrical (vs. entire and symmetrical). Nothodissotis includes two species: the type species N.barteri (Hook.f.) Veranso-Libalah & G.Kadereit, comb. nov. (syn. Dissotisbarteri Hook.f.), and the new species N.alenensis Veranso-Libalah & O. Lachenaud, sp. nov., described and illustrated here. Both species are restricted to open vegetation on rock outcrops within the forested region of Atlantic Central Africa. Nothodissotisbarteri has a scattered distribution in Cameroon, Equatorial Guinea, Gabon and Príncipe Island, while N.alenensis is endemic to the Monte Alén massif in Equatorial Guinea, an area where N.barteri does not occur. Nothodissotisalenensis differs from N.barteri by its hypanthium bearing sessile appendages with penicillate hairs (vs. stalked stellate appendages) and its staminal appendages that are much smaller in antepetalous than in antesepalous stamens (vs. subequal in all stamens). The conservation status of both N.barteri and N.alenensis is assessed as Vulnerable in accordance with IUCN criteria.

Impatiens banensp. nov. &I. etugeisp. nov. (Balsaminaceae), threatened lowland species of the Cross-Sanaga Interval, Cameroon

“…Ver.-Lib. & G.Kadereit (Melastomataceae) is an additional range-restricted and threatened (Vulnerable) species of the Ebo inselbergs, forming large shrubs to small spreading trees on domed surfaces (Veranso-Libalah et al . 2019).…”

Towards a complete phylogeny of African Melastomateae: Systematics of Dissotis and allies (Melastomataceae)

“…Macrocarpae and are now treated in Nothodissotis Ver.‐Lib. & G.Kadereit (Veranso‐Libalah & al., 2019). Four of the above species ( D .…”

A Guide to Curating New World Melastomataceae Collections with a Linear Generic Sequence to World-Wide Melastomataceae

“…The linear sequence provided here is based on a compilation of recent published and unpublished phylogenetic analyses (Clausing et al 2000, Clausing and Renner 2001a, Clausing and Renner 2001b, Michelangeli et al 2004, Amorim et al 2009, Penneys et al 2010, Michelangeli et al 2011, Goldenberg et al 2012, Penneys 2013, Penneys and Judd 2013a, Goldenberg et al 2015, Kriebel et al 2015, Rocha et al 2016a, Rocha et al 2016b, Veranso-Libalah et al 2017, Dellinger et al 2018, Rocha et al 2018, Veranso-Libalah et al 2018, Bacci et al 2019, Bochorny et al 2019, Guimarães et al 2019, Veranso-Libalah et al 2019, Wurdack and Michelangeli 2019, Zhou et al 2019a, Zhou et al 2019b. The number of species per genus and comments on generic limits are based on the systematic and/or monographic studies cited below.…”

“…The limits of the tribe correspond largely with those of the Melastomateae sensu Renner (1993) with the exclusion of the genera now in Marcetieae and other minor modifications , Rocha et al 2016a, Veranso-Libalah et al 2017. The circumscription the African genera has recently been addressed (Veranso-Libalah et al 2017, Veranso-Libalah et al 2019, Veranso-Libalah et al 2020. Within Neotropical Melastomateae the large genus Tibouchina has been recently segregated into four smaller genera, Andeasanthus, Chaetogastra, Pleroma, and Tibouchina (Guimarães et al 2019), with Pleroma also including Itatiaia, Microlepis, Svitramia, and Tibouchinopsis (Da Silva et al 2014, Romero and Alves Versiane 2014, Guimarães et al 2019.…”