Muhlenbergia spatha: A Habit B Panicle partially enclosed by the leaf sheath C Basal panicle branch with a lower sterile floret and small cuplike structures (callus remains) where the fertile spikelets were inserted D Spikelet, side view E Upper glume showing three recurved awns, dorsal view. (Peterson 25544 & Herrera Arrieta, CIIDIR).

  Part of: Peterson PM, Arrieta YH, Romaschenko K (2018) Phylogeny of Muhlenbergia subg. Pseudosporobolus, including M. spatha (Poaceae, Chloridoideae, Cynodonteae, Muhlenbergiinae) now found in Zacatecas, Mexico. PhytoKeys 103: 83-94.