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Descriptions

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

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

Poa sunbisinii

HABIT Annual, or perennial; short-lived; caespitose. Culms erect, or geniculately ascending; 25–80 cm long; 1–3.5 mm diam.; 2–4 -noded; with 0.5 of their length below uppermost node. Culm-internodes smooth, or scaberulous. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths open for most of their length; with 0.5 of their length closed; 6–15 cm long; smooth; glabrous on surface. Ligule an eciliate membrane; 1–2(–5) mm long; scaberulous on abaxial surface; obtuse. Collar glabrous. Leaf-blades flat, or conduplicate; 8–30 cm long; 1.5–5 mm wide. Leaf-blade venation prominent; with 4–10 secondary veins. Leaf-blade surface scabrous; rough abaxially, or on both sides; glabrous. Leaf-blade margins smooth, or scaberulous. Leaf-blade apex abruptly acute; hooded.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 8–25 cm long. Primary panicle branches ascending, or spreading; 2 -nate; 8–11 cm long; bearing 5–13 fertile spikelets on each lower branch. Panicle axis with lower internodes 4 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 7–10 mm long; with hairs extending 4–7 mm beyond apex; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long; scaberulous. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3.3–4.6 mm long; 0.9 length of upper glume; membranous; purple; 1-keeled; 1–3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins obscure. Lower glume apex acute. Upper glume lanceolate; 3.8–5 mm long; 0.9 length of adjacent fertile lemma; membranous; purple; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma ovate; 3.7–5.2 mm long; membranous; much thinner on margins; keeled; 5 -veined. Lemma midvein scabrous. Lemma surface scabrous. Lemma apex acute. Palea surface scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 0.7–1.6 mm long.

DISTRIBUTION Asia-temperate: China.

NOTES Poeae. Fl China 2007.

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