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Descriptions

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

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

Muhlenbergia aguascalientensis

HABIT Perennial; caespitose. Rhizomes short. Culms erect; 30–58 cm long. Leaf-sheaths 1–1.5 cm long; mostly shorter than adjacent culm internode; without keel; striately veined; smooth, or scaberulous. Leaf-sheath auricles erect; 1–2(–6) mm long. Ligule an eciliate membrane; 0.5–1 mm long; obtuse. Leaf-blades flat, or conduplicate; 5–15 cm long; 1–2.5 mm wide. Leaf-blade surface scaberulous. Leaf-blade margins cartilaginous; scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; pyramidal; 5–8 cm long; 2–4 cm wide. Primary panicle branches ascending, or spreading; 2–5 cm long. Panicle axis scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–2.5 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; exceeding apex of florets. Lower glume lanceolate; 5–6.5 mm long; 1 length of upper glume; membranous; dark green; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 5–6.5 mm long; 1.1–1.3 length of adjacent fertile lemma; membranous; dark green; without keels; 3 -veined. Upper glume lateral veins obscure. Upper glume surface asperulous. Upper glume apex acuminate; muticous, or mucronate.

FLORETS Fertile lemma lanceolate; 4.5–5 mm long; membranous; without keel; 3 -veined. Lemma surface glabrous, or pubescent; hairy at base; hairy on veins. Lemma apex dentate; 2 -fid; with lobes 0.2 mm long; awned; 1 -awned. Principal lemma awn from a sinus; flexuous; 20–35 mm long overall. Palea oblanceolate; 4.2–4.8 mm long; 2 -veined. Palea keels eciliate, or pubescent; adorned below.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 2.4–3 mm long; purple.

FRUIT Caryopsis with adherent pericarp; fusiform.

DISTRIBUTION North America: Mexico.

NOTES Eragrostideae. Herrera & Centa 2002.

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