Poa subenervis

HABIT Perennial; caespitose. Rhizomes elongated. Culms erect; 15–20 cm long. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths smooth. Ligule a ciliolate membrane; 1–1.5 mm long; pubescent on abaxial surface; truncate. Leaf-blades flat, or conduplicate; 2–3.5 cm long; 3–4 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 4–6 cm long; bearing few spikelets. Panicle branches smooth, or scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 5–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1–1.5 mm long; smooth, or scaberulous. Floret callus woolly. Floret callus hairs 1–1.5 mm long; 0.25–0.33 length of lemma.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3.5–4.5 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 4–5 mm long; 0.9–1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma ovate; elliptic in profile; 4.5–5.5 mm long; membranous; keeled; 5 -veined. Lemma midvein scabrous. Lemma lateral veins obscure. Lemma surface glabrous. Lemma apex acuminate; mucronate. Palea keels woolly; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 2–2.5 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION South America: southern South America.

NOTES Poeae. Fl Pat 1995.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.