Poa chaixii

Common names: Chaix's bluegrass
Treatment appears in FNA Volume 24. Treatment on page 540.
Please click on the illustration for a higher resolution version.
Illustrator: Sandy Long

Copyright: Utah State University

Plants perennial; densely tufted, not stoloniferous, not rhizomatous. Basal branching extravaginal. Culms 50-120 cm, stout. Sheaths closed for 1/2 - 3/4 their length, distinctly compressed, keels winged, bases of basal sheaths glabrous; ligules 1-2 mm, smooth or sparsely scabrous, apices truncate; blades (4)6-15 mm wide, flat or folded, apices broadly and abruptly prow-shaped. Panicles 10-20 cm, ovoid to pyramidal, open, spikelets numerous, with 3-5 branches per node; branches ascending to spreading, angled, angles densely scabrous. Spikelets 4-9 mm, laterally compressed; florets 3-5; rachilla internodes about 1 mm, scabrous, glabrous. Glumes distinctly keeled, keels scabrous; lower glumes 1-3-veined; calluses glabrous; lemmas 3.5-4.5 mm, narrowly lanceolate, distinctly keeled, scabrous, glabrous throughout, lateral veins prominent, apices acute; palea keels scabrous, glabrous; anthers 1.5-3 mm. 2n = 14.


Poa chaixii was introduced from Europe as an attractive ornamental, and has occasionally escaped. A population in southwestern Quebec has been extirpated.

Selected References


Lower Taxa