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 bomiensis

HABIT Annual; caespitose. Culms erect; 20–35(–55) cm long; 0.8–1.5 mm diam.; 2–3 -noded. Culm-internodes elliptical in section; antrorsely scabrous. Lateral branches lacking. Leaf-sheaths open for most of their length; with 0.4–0.5 of their length closed; 8–12 cm long; subequal to internodes; with winged keel; retrorsely scabrous; glabrous on surface. Ligule an eciliate membrane; 1–2.5 mm long; truncate, or obtuse, or acute. Leaf-blades 6–11 cm long; 2–5 mm wide. Leaf-blade surface smooth, or scabrous; rough adaxially. Leaf-blade margins smooth, or scaberulous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; dense; 7–14 cm long; 1–3 cm wide. Primary panicle branches 2 -nate; 3–5 cm long; bearing 1–4 fertile spikelets on each lower branch. Panicle axis with lower internodes 2–2.5 cm long. Panicle branches flexuous; smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes scaberulous. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume linear, or lanceolate; 2.3–3.5 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein smooth to scabrous. Lower glume lateral veins absent, or obscure. Lower glume surface scabrous; rough above. Lower glume apex acuminate. Upper glume lanceolate; 3.3–4.5 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface scabrous; rough above. Upper glume apex acute.

FLORETS Fertile lemma lanceolate, or oblong, or ovate; 3.2–5 mm long; membranous; keeled; 5(–7) -veined. Lemma lateral veins prominent. Lemma surface scaberulous. Lemma apex acuminate. Palea keels scabrous; with 0.66–0.75 of their length adorned. Palea surface scaberulous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1–1.7 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.