On the genus Brachypodium P. Beauv. (Poaceae) in Russia

Abstract

The genus Brachypodium P. Beauv. numbers 10 species in Russia. A key for their determination is given. Two new combinations are made: B. spryginii (Tzvelev) Tzvelev and B. juzepczukii (Tzvelev) Tzvelev.

Phylogenetics of the Paleartic model grass Brachypodium sylvaticum uncovers two divergent oriental and occidental micro-taxa lineages

“…breviglume, B. kurilense, and B. miserum as distinct to typical B. sylvaticum s. s. based on their short lower glume (more than 1.5 times shorter than the upper glume), which is shorter in B. sylvaticum var. breviglume (3-5 mm) than in the Pacific taxa (4.5-6 mm) (Keng 1982, Tzvelev 2015. Brachypodium kurilense, also subordinated to B. miserum in some taxonomic treatments, departs from the latter taxon based on the short prickles and hairiness of its spikelet pedicel and axis (Probatova & Skolovskaya 1985, Tzvelev 2015.…”

“…The re maining six cryptic micro-taxa were de scribed from dif fe rent regions of eastern Europe, Asia, and Ma le sia. Keng 1982, Tzvelev 1983, 2015, Pro ba tova & Skolovskaya 1985, Tzvelev & Probatova 2019 based on features related to the length of glumes, plant pu bes cence and height of the plant. All the B. sylvaticum com plex taxa are further characterized by a constant diploid chro mo some number of 2n = 2x = 18 and a chromosome base number of x = 9 (Wolny & Hasterok 2009, Catalán et al 2016, Tzvelev & Probatova 2019, Decena et al 2023.…”

“…Despite the enormous advances attained in the genomic study of the model perennial grass B. sylvaticum s. s., the syste matics of the B. sylvaticum complex micro-taxa is almost un known. Taxonomically, the morphological characters used to se pa rate several of these micro-taxa are extremely plas tic and variable, and have been considered of doubtful taxono mic re le vance in some cases (Tzvelev 2015, Catalán et al 2016. Nonetheless, some of these taxa show large dis junct geographic distributions in both extremes of Eurasia, which could have led to genetic isolation and evolu tio nary di vergence.…”

“…1, Table 1). The taxo no mic identification of the studied materials was based on previous taxonomic treatments of Brachypodium (Keng 1982, Schippmann 1991, Catalán et al 2012, Tzvelev 2015, Tzvelev & Probatova 2019. Chromosome and ploidy level information was retrieved from these studies and from a broad cyto-phylogenomic study of Brachypodium perennial species performed by Decena et al (2023, and unpub.…”

“…Maximum likelihood (ML) phylogenetic trees were recon structed for each separated data set with IQ-TREE 1.6. im posing the best-fit nucleotide substitution model, ac- Keng (1982), Probatova (1985), Schippmann (1991), Catalán et al (2012), Tzvelev (2015), Tzvelev & Probatova (2019).…”