Culms to 12 cm, ascending, often decumbent or geniculate at the
concealed by the leaves. Blades 2-4 cm, involute, usually curved
outward, tapering to a fine point. Spikes 1.5-6 cm, more or less
included in the upper sheaths at maturity, congested throughout; internodes 1-2
with 5-10 florets. Glumes subequal (or the lower slightly shorter
than the upper), 4-7 mm, mucronate, sometimes with 1 or 2 short lateral
5-7 mm, prominently 11-15-veined, apices erose or with a few minute teeth,
central vein extending into a prominent mucro as much as 1 mm long; paleas slightly
shorter than the lemmas; anthers about 3 mm, yellow, becoming pinkish
in drying; lodicules about 0.5 mm, fused to the paleas. Caryopses about
3 mm, laterally compressed, broadly oblong, smooth. 2n = 40.
Tuctoria mucronata is known from only two locations in Solano County, California;
both locations are at elevations below 10 m.