The original material of Poa pseudoconcinna is evaluated, and LW00213479 described and is designated as the lectotype. The lectotype material appears to be indistinct from P. bulbosa s. str. The taxonomic disposition of P. pseudoconcinna sensu auct., considered to be a diploid race, subspecies, or variety of P. bulbosa, is evaluated, including its relationships to P. delicatula, P. carniolica, P. jordanovii, and P. perconcinna. Chromosome count data for P. bulbosa and related diploids are summarized, and diploid vouchers are noted. Diploid counts for P. bulbosa are doubted. Evidence suggests Nygren’s counts for P. concinna (≡ P. perconcinna) belong to P. molinerii. Lectotypes are also designated for the names P. alpina var. multiflora, P. concinna, P. bulbosa var. colorata, P. concinna var. carniolica, along with an epitype, and P. timoleontis. Poa badensis subsp. molinerii comb. nov. is validated.

Keywords: Arenariae, bulbous bluegrasses, chromosome numbers, lectotypifications, Schur, taxonomy

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