2. Phalaris brachystachys Link (shortspike canary grass)
Pl. 135 g,
h; Map 546
Plants annual, forming tufts. Flowering stems 25–90 cm long.
Leaf sheaths with the ligule 2–7 mm long. Leaf blades 4–25 cm long, 3–11 mm
wide. Inflorescences 1.5–4.0 cm long, 15–20 mm wide, appearing as dense, ovoid,
uninterrupted spikes, the branches very short and inconspicuous. Glumes
(4.0–)6.5–8.5 mm long, glabrous or hairy, the midnerve (keel) relatively
broadly winged toward the tip, the wing up to 1 mm wide at its broadest point.
Sterile lemmas 0.6–1.2 mm long, oblong‑ovate, swollen and somewhat
fleshy, glabrous or with a tuft of short hairs at the base. Fertile lemma
4.5–5.5 mm long, ovate, hairy. Anthers 2.5–3.5 mm long. Fruits 3.5–4.0 mm long,
elliptic to oblong‑ovate in outline, light brown. 2n=12, 14.
Introduced, known only from a single historical collection
from Laclede County (native of Europe, Africa, Asia; introduced sporadically in
the western U.S.). Margin of a pond.