Poa hartzii

HABIT Perennial; caespitose; clumped densely. Culms erect; 15–25 cm long. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2–5 mm long; acute. Leaf-blades erect, or ascending; involute; 2–7 cm long; 1 mm wide; stiff. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 3–5 cm long. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume elliptic; 3 mm long; 0.9 length of upper glume; membranous; much thinner on margins; 1-keeled; 3 -veined. Lower glume lateral veins obscure. Lower glume apex acute. Upper glume elliptic; 3.5 mm long; 0.66 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume lateral veins obscure. Upper glume apex acute.

FLORETS Fertile lemma ovate; elliptic in profile; 4–5 mm long; membranous; much thinner on margins; keeled; 5 -veined. Lemma lateral veins obscure. Lemma surface pubescent; hairy below; hairy on back. Lemma apex acute. Palea 1 length of lemma. Palea keels scaberulous; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

CLEISTOGENES AND VIVIPARY Vegetative proliferation occurs.

DISTRIBUTION Asia-temperate: Soviet far east. North America: Subarctic.

NOTES Poeae. Circumpolar Fl 1994.

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