Culms 15-150(250) cm, erect, rigid; basal internodes
2-6 cm, usually swollen and clavate. Collars marked with a line
or narrow ridge; sheaths smooth, mostly glabrous, margins sparsely
blades 0.2-1 cm wide. Panicles 5-40 cm, usually contracted; branches
short and erect or long and lax. Spikelets 4-9 mm. Lower glumes
1.5-2.5 mm, hyaline, obtuse, slightly erose; upper glumes 2-3
calluses completely or almost glabrous; lemmas 2.5-4.5
mm, ovate, acute to obtuse; anthers 1.5-3 mm, purple. 2n =
18, 36, 90.
Molinia caerulea is established at scattered locations in the Flora region, but not at all the locations where it has been found. For instance,
the record for Pennsylvania reflects a collection made in 1945 from an abandoned
field; there are no extant populations known in the area. Most records are from
southeastern Canada and the northeastern United States, but it has also been
reported as being established in western Oregon.
Plants with long, lax panicle branches have been called Molinia
caerulea subsp. arundinacea (Schrank) H. Paul rather than M.
(L.) Moench subsp. caerulea, but there are many
Perennial 5-12 dm, thickened at the nodes, the lower internodes very short, the lowest node often disarticulating; sheaths pilose at the throat; blades 2-4 dm נ3-6 mm; infl narrow, purplish, 1-3 dm, the ascending branches fascicled; glumes lanceolate, mostly 1-veined, the first 2.1-2.6 mm, the second 2.4-3 mm; lemmas glabrous, acute or acutish, 3.4-4.5 mm; rachilla-joints 1.3-2 mm, glabrous or hairy, usually short-pilose at the top; 2n=36. Native of Europe, intr. in fields, meadows, and roadsides from Me. to Pa., w. to Ont. and Wis.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.