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.

Koeleria riguorum

HABIT Perennial. Rhizomes elongated. Butt sheaths persistent and investing base of culm. Basal innovations extravaginal. Culms erect, or geniculately ascending; slender; 25–36 cm long. Culm-internodes distally glabrous to hirsute. Leaf-sheaths ribbed; puberulous. Ligule a ciliolate membrane; 0.6–1.1 mm long; truncate, or acute. Leaf-blades filiform, or linear; flat, or conduplicate, or involute; 3.2–17 cm long; 0.3–1.2 mm wide. Leaf-blade surface ribbed; grooved adaxially; puberulous; hairy adaxially. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; interrupted; 2–7 cm long; 0.3–1 cm wide. Panicle axis pubescent. Panicle branches pubescent.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with a barren rhachilla extension. Spikelets laterally compressed; 3.6–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.8–1.2 mm long; pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet; similar to fertile lemma in texture; shiny; gaping. Lower glume lanceolate, or elliptic; 3.4–4.1 mm long; 0.9–1 length of upper glume; membranous; 1-keeled; 1–3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent, or distinct. Lower glume apex entire, or erose; obtuse, or acute. Upper glume lanceolate, or elliptic; 4–4.2 mm long; 0.9–1 length of adjacent fertile lemma; membranous; 1-keeled; 3–5(–7) -veined. Upper glume primary vein scabrous. Upper glume apex entire, or erose; obtuse, or acute.

FLORETS Fertile lemma elliptic; 4–4.6 mm long; membranous; shiny; keeled. Lemma surface smooth, or asperulous; rough above. Lemma apex entire, or dentate; 2 -fid; muticous, or mucronate, or awned; 1 -awned. Principal lemma awn subapical; 0–2 mm long overall. Palea gaping; 4–4.2 mm long; 1 length of lemma. Palea keels scabrous; adorned above; with 0.66 of their length adorned. Rhachilla extension 1–1.5 mm long; pilose.

FLOWER Lodicules 2; 0.5–1.2 mm long; membranous. Anthers 3; 0.5–1.7 mm long.

FRUIT Caryopsis with adherent pericarp; 2 mm long.

DISTRIBUTION Australasia: New Zealand.

NOTES Aveneae. Edgar & Gibb 2000.

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