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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Poa zhongdianensis
HABIT Perennial; caespitose; clumped loosely. Rhizomes short. Culms 40–70 cm long; 1–1.5 mm diam.; 3–4 -noded. Culm-internodes smooth. Lateral branches lacking. Leaf-sheaths open for most of their length; with 0.6 of their length closed; 4.5–7.5 cm long; keeled; retrorsely scabrous; puberulous. Leaf-sheath oral hairs lacking, or ciliate. Ligule an eciliate membrane; 1.7–2.2 mm long; 0.3–0.5 mm long on basal shoots; scaberulous on abaxial surface; truncate, or obtuse. Leaf-blades flat, or conduplicate; 5–20 cm long; 2–3 mm wide. Leaf-blade surface scabrous; rough adaxially, or on both sides. Leaf-blade margins scabrous. Leaf-blade apex hooded.
INFLORESCENCE Inflorescence a panicle.
Panicle open; pyramidal; 10–18 cm long; 5–10 cm wide. Primary panicle branches spreading; 2–4 -nate; 4–7 cm long; bearing 4–12 fertile spikelets on each lower branch. Panicle axis with lower internodes 2–3.5 cm long. Panicle branches smooth, or scaberulous.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets oblong, or ovate; laterally compressed; 4–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1–1.2 mm long; scaberulous. Floret callus woolly.
GLUMES Glumes persistent; similar; with lower narrower than upper; shorter than spikelet. Lower glume lanceolate; 1.5–2.3 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein smooth. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 2.5–3 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 florets bisexual, or female. Fertile lemma lanceolate; 3.5–4 mm long; chartaceous; keeled; 5 -veined. Lemma midvein ciliolate; hairy above. Lemma surface scaberulous and papillose. Lemma margins ciliolate; hairy above. Lemma apex acute. Palea keels scabrous. Palea surface scaberulous, or papillose. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2; membranous. Anthers 3; 1.8–2 mm long.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform.
DISTRIBUTION Asia-temperate: China.
NOTES Poeae. Fl China 2005.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
