3.1 Morphological characters
Roegneria yenchiana is morphologically recognized as a species ofRoegneria by the typical characters that have traditionally one
spikelets per node and spikelets with functionally disarticulating above
the glumes. This species is distinguished from other species ofRoegneria by its rudimentary spikelets at the tortuous
inflorescence base, rectangular glumes, and awns flanked by two short
mucros in lemmas. Roegneria ciliaris has the StY genomes
and is morphologically the most similar species to R. yenchianaoccurring in the Hengduan Mountain region (Lu, 1992). Despite this,R. ciliaris has not been observed near to the place whereR. yenchiana grows. Roegneria yenchiana can be
distinguished from R. ciliaris in several traits, including glume
length, ciliates in lemma margin, lemma back, and the paleas length.