02488nas a2200181 4500008004100000245012600041210006900167300001200236490000800248520179400256100001902050700002402069700001802093700001602111700002302127700001402150856014202164 2015 eng d00aMorphology, molecular phylogenetics and biogeography of Impatiens akomensis (Balsaminaceae), a new species from Cameroon.0 aMorphology molecular phylogenetics and biogeography of Impatiens a397-4080 v1483 a

Background and aims – A recent field expedition in the Campo-Ma’an/Akom II region in Cameroon
resulted in the collection of a previously unknown Impatiens species, which resembles Impatiens macroptera
and Impatiens pseudomacroptera. This study aims to describe and infer the evolutionary history of this
novelty by using phylogenetics, biogeographic inference and dating estimation analyses.
Methods – The new species was subject to a palynological, molecular phylogenetic and biogeographical
analysis. In addition, a thorough morphological comparison with its closely related species was conducted.
Key results – Morphological comparison and molecular phylogenetics corroborate its status as a new
species, which is given the name Impatiens akomensis. Molecular data, based on ImpDEF1, ImpDEF2 and
ITS indicate that Impatiens akomensis is most closely related to the Cameroonian I. macroptera, whereas
the lineage towards I. macroptera and the novelty is sister to the Gabonese I. pseudomacroptera. Impatiens
akomensis differs from I. macroptera and I. pseudomacroptera in having very strongly asymmetric white
flowers, much thicker leaves, a narrowly elliptic leaf shape and a serrulate leaf margin, smaller lateral
united petals (23.1–24.2 mm) and larger bracts (12–20 mm). The new species qualifies for endangered
status under IUCN criteria B2 and probably B1.
Conclusions – Dating analyses in combination with biogeographic inference, and ecological and
environmental interpretation of the novelty and its closely related species allows us to infer the putative
evolutionary history of Impatiens akomensis

1 aJanssens, S.B.1 aSonké, Bonaventure1 aLachenaud, O.1 aLemaire, B.1 aSimo-Droissart, M.1 aSmets, E. uhttps://rubiaceae-africa.myspecies.info/content/morphology-molecular-phylogenetics-and-biogeography-impatiens-akomensis-balsaminaceae-new01542nas a2200133 4500008004100000245009800041210006900139300001200208490000700220520097600227100002301203700002401226856015801250 2015 eng d00aLe genre Oxyanthus (Rubiaceae) en Afrique de l’Ouest: description d’une nouvelle espèce.0 aLe genre Oxyanthus Rubiaceae en Afrique de l Ouest description d a241-2470 v703 a

A new species, Oxyanthus andjigae Sonké & O. Lachenaud (Rubiaceae), from Ivory Coast and Sierra Leone, is described
and illustrated. It is closely related to Oxyanthus racemosus (Schumach. & Thonn.) Keay and Oxyanthus setosus Keay, and
was previously confused with the latter species; however, it differs from both in the longer corolla tube (18-19.5 cm vs
(7-)11-15.5 cm) and the longer hairs on the twigs (1.5-2 mm long vs. ≤ 1 mm in Oxyanthus setosus and ≤ 0.5 mm in
Oxyanthus racemosus). From Oxyanthus setosus it is also separated by the distribution, the latter species occuring from
Nigeria to Gabon. The species is assessed as “Endangered” following IUCN Categories and Criteria. A new identification
key to West African species of Oxyanthus DC. is presented; Oxyanthus oliganthus K. Schum. is newly reported from
Côte d’Ivoire and Ghana.
 

1 aLachenaud, Olivier1 aSonké, Bonaventure uhttps://rubiaceae-africa.myspecies.info/content/le-genre-oxyanthus-rubiaceae-en-afrique-de-l%E2%80%99ouest-description-d%E2%80%99une-nouvelle-esp%C3%A8ce