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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.
Muhlenbergia monandra
HABIT Annual; caespitose. Culms geniculately ascending; 4–25 cm long; 0.3–0.7 mm diam.; 2–3 -noded. Culm-internodes smooth, or scaberulous. Culm-nodes glabrous. Lateral branches ample. Leaf-sheaths 0.4–4.7 cm long; mostly shorter than adjacent culm internode; scaberulous; glabrous on surface. Ligule an eciliate membrane; 1–3 mm long; erose, or lacerate; acute. Leaf-blades flat, or conduplicate; 0.3–7 cm long; 0.7–3.5 mm wide. Leaf-blade surface pilose; sparsely hairy; hairy adaxially. Leaf-blade apex acute, or acuminate.
INFLORESCENCE Inflorescence a panicle; exserted, or embraced at base by subtending leaf.
Panicle spiciform; elliptic, or oblong; interrupted; 0.5–3.7 cm long; 0.2–0.8 cm wide. Primary panicle branches appressed; 0.4–1.5 cm long. Panicle branches scabrous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.1–0.2 mm long; scabrous.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 1.3–4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent; obtuse.
GLUMES Glumes persistent; similar; exceeding apex of florets. Lower glume lanceolate; 1–4.3 mm long; 0.9 length of upper glume; membranous; without keels; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 1.2–4.5 mm long; 1–2.5 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acuminate.
FLORETS Fertile lemma elliptic, or oblong; 1.3–2.1 mm long; membranous; mid-green and grey; mottled with last colour; without keel; 3 -veined. Lemma lateral veins obscure. Lemma surface pilose. Lemma hairs 0.4 mm long. Lemma apex dentate; 2 -fid; acute; awned; 1 -awned. Principal lemma awn from a sinus; straight, or flexuous; 1.1–4.2 mm long overall. Palea elliptic; 1.2–2 mm long; 2 -veined. Palea surface pilose; hairy on back. Palea apex dentate; 2 -fid.
FLOWER Lodicules 2; cuneate; 0.1–0.2 mm long; fleshy; truncate. Anthers 1; 0.2–0.6 mm long; retained within floret.
FRUIT Caryopsis with adherent pericarp; oblong; 0.9–1.5 mm long. Embryo 0.66–0.75 length of caryopsis. Hilum punctiform.
DISTRIBUTION South America: western South America.
NOTES Eragrostideae. Alegria & Rugolo 2005.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
