GrassBase - The Online World Grass Flora


W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Poa erectifolia

HABIT Perennial; caespitose; clumped densely. Butt sheaths grey, or purple. Basal innovations intravaginal. Culms erect; 20–40 cm long; 2–3 -noded. Leaf-sheaths 2–5 cm long; smooth; glabrous on surface. Ligule an eciliate membrane; 1.5–4 mm long; acute. Leaf-blades conduplicate, or involute; 8–20 cm long; 1–2 mm wide. Leaf-blade venation with 7–9 secondary veins. Leaf-blade surface scabrous; rough adaxially; glabrous. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth, or scaberulous above.

Panicle open; pyramidal; 4–8 cm long. Primary panicle branches appressed, or ascending; 1–3 -nate; 1.5–3 cm long. Panicle branches flexuous; angular; scabrous; rough distally.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; 3.5–4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.3–0.5 mm long; smooth. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.2–3.5 mm long; 0.66–0.9 length of upper glume; membranous; 1-keeled; 1–3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent, or distinct. Lower glume surface scabrous. Lower glume apex acute. Upper glume lanceolate; 3.2–3.7 mm long; 0.9–1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface scabrous. Upper glume margins ciliolate. Upper glume apex acute.

FLORETS Fertile lemma ovate; elliptic in profile; 3–4 mm long; membranous; keeled; 5 -veined. Lemma surface scabrous; rough generally. Lemma margins eciliate, or ciliolate. Lemma apex acute. Palea elliptic; 3.5–3.8 mm long. Palea keels scaberulous; adorned above. Palea surface scabrous. Rhachilla extension 0.75–1.5 mm long.

FLOWER Lodicules 2; membranous. Anthers 3; 1.1–2.25 mm long.

FRUIT Caryopsis with adherent pericarp; fusiform; 1.7 mm long. Hilum punctiform.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Poeae. Alp Fl N Guin 1994.

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