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 lamii

HABIT Perennial; caespitose; clumped densely. Basal innovations extravaginal. Culms erect; 25–40 cm long. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths 4–5 cm long. Ligule an eciliate membrane; 2–2.5 mm long; acute. Leaf-blades filiform; involute; 10–15 cm long; 0.75–1 mm wide. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 4–6 cm long; with spikelets clustered towards branch tips. Primary panicle branches reflexed; bearing 1–4 fertile spikelets on each lower branch. Panicle branches capillary; flexuous; scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2(–3) fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; 4–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2 mm long (distal); villous. Floret callus glabrous, or pubescent (sparsely).

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; 3 -veined. Lower glume apex acute. Upper glume lanceolate; 3.5–4.5 mm long; 1.1–1.5 length of adjacent fertile lemma; membranous; 1-keeled; 3(–5) -veined. Upper glume apex acute.

FLORETS Fertile lemma oblong; elliptic in profile; 3 mm long; herbaceous; keeled; 5 -veined. Lemma surface scabrous; rough between veins; glabrous. Lemma apex acute. Palea keels scabrous; adorned above.

FLOWER Lodicules 2; membranous. Anthers 3; 1.5 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Poeae. Jansen 1992.

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