Abstract
A comprehensive treatment of the N African genus Heteromera Pomel (Compositae, Anthemideae) is presented. Morphological, anatomical and karyological features as well as distribution maps are reported. The analysis of nrDNA and cpDNA sequence variation reveals the close relationship of the two species, with H. philaenorum exhibiting little variation and being well separated from a more diverse H. fuscata. The chromosome numbers of H. fuscata and H. philaenorum are reported for the first time. Heteromera philaenorum Maire & Weiller, Chrysanthemum fuscatum f. pubescens Trotter and Chrysanthemum fuscatum f. subcanescens Trotter are lectotypified and H. philaenorum is reported as new for the flora of Algeria and Tunisia. Citation: Vogt R., Wagner F. & Oberprieler C. 2021: The genus Heteromera (Compositae, Anthemideae). – Willdenowia 51: 233–249. Version of record first published online on 17 August 2021 ahead of inclusion in August 2021 issue.
Highlights
The genus Heteromera Pomel was established by Auguste Pomel (1874) to include the N-African species Chrysanthemum fuscatum Desf. (Desfontaines 1799) and – with reservations – Pyrethrum macrocarpum Coss
Heteromera is characterized by achenes with non-valecular resin ducts or sacs in the upper part of the ribs, a characteristic found in Aaronsohnia Warb. & Eig, Matricaria L. and Daveaua Mariz, which led Bremer & Humphries (1993) to include Heteromera in the subtribe Matricariinae sensu Bremer & Humphries (1993)
While in Wagner & al. (2019) the two species of Heteromera were already included in a molecular phylogenetic study, only a single individual for each species was analysed and, no assessment of the genetic variation throughout their geographical range was possible
Summary
The genus Heteromera Pomel was established by Auguste Pomel (1874) to include the N-African species Chrysanthemum fuscatum Desf. (Desfontaines 1799) and – with reservations – Pyrethrum macrocarpum Coss. The genus Heteromera Pomel was established by Auguste Pomel (1874) to include the N-African species Chrysanthemum fuscatum Desf. (Desfontaines 1799) and – with reservations – Pyrethrum macrocarpum Coss The latter taxon is today placed in the genus Endopappus Sch. Bip. Renato Pampanini (1914a, 1914b) was the first to report a certain variability within the genus From Tarhunah in Libya was characterized and separated from the typical form by a dense pubescence and small size of stems and leaves It was René Maire and Marc Weiller (1939) who noticed the deviating achene morphology and size of these plants and described the taxon at specific rank as Heteromera philaenorum Maire & Weiller. While in Wagner & al. (2019) the two species of Heteromera were already included in a molecular phylogenetic study, only a single individual for each species was analysed and, no assessment of the genetic variation throughout their geographical range was possible
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