Poa orizabensis

HABIT Perennial; caespitose. Culms 40–60 cm long; 1 -noded. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 2 mm long. Leaf-blades conduplicate; 5–15 cm long; 2–4 mm wide; 1.5–2 cm long at summit of culm. Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 16 cm long. Primary panicle branches spreading, or drooping; 1–2 -nate. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; 4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.5 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma oblong; 3 mm long; membranous; purple; keeled; 5–7 -veined. Lemma midvein pectinately ciliate. Lemma surface asperulous. Lemma apex acute.

FLOWER Lodicules 2; membranous. Anthers 3.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION North America: Mexico. South America: Mesoamericana.

NOTES Poeae. Hitchcock 1995.

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