Erioneuron avenaceum

(Kunth) Tateoka
Common names: Large-flowered tridens Shortleaf woolygrass
Synonyms: Tridens grandiflorus Erioneuron grandiflorum
Treatment appears in FNA Volume 25. Treatment on page 45.

Culms (7)10-30(40) cm tall, (0.4)0.7-1 mm thick, glabrous; nodes glabrous or villous. Ligules to 0.5 mm; blades (1.5)3-5(8) cm long, (0.5)1-1.5(2.5) mm wide, both surfaces sparsely pilose. Panicles 2-8(10) cm; branches with 2-10(16) shortly pedicellate spikelets. Spikelets 6-8(10) mm, purplish, with (4)6-12(20) florets; lower glumes 4-7 mm; upper glumes 6-9 mm, equaling or exceeding the lowest florets; lemmas 4-7 mm, purplish-green, awned from between the lobes, awns 2-4 mm, apices bilobed, lobes 1-2 mm, obtuse to acute; anthers 0.4-1 mm or (when monandrous) to 1.3 mm. Caryopses 1-1.4 mm. 2n = 16, 32.


Erioneuron avenaceum is common in rocky areas from the southwestern United States to central Mexico; it also grows in Bolivia and Argentina. North American plants belong to E. avenaceum (Kunth) Tateoka var. avenaceum. Stoloniferous plants occur in the Flora region, but they are most common in central Mexico.

Selected References


Lower Taxa