Publication: U.S.D.A. Div. Bot. Bull. 13(2): pl. 81. 1893.
selected vouchers: WTU
Notes: FNA24: "Poa nervosa occurs infrequently at low elevations in the western foothills of the northern Cascade Mountains and adjacent coast ranges, extending eastward up the Columbia Gorge as far as Multnomah Falls. It usually grows in wet habitats, such as mossy cliffs with seeps and around waterfalls, but it is also found in rich, old growth, mixed deciduous and conifer forests. It appears to be sexually reproducing and sequentially gynomonoecious.
Poa nervosa differs from P. wheeleri in having densely pubescent leaf collar margins, and glabrous or more sparsely and shortly pubescent sheaths. It also differs in usually having well-developed anthers, and in being tetraploid. The two species are geographically isolated and ecologically distinct. Plants from the Columbia River Gorge in Oregon, including P. ×multnomae Piper, that approach P. tenerrima are presumed to be derived from hybridization between P. nervosa and P. secunda."