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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 texana

HABIT Annual; caespitose. Culms erect, or geniculately ascending; slender; 10–35 cm long. Culm-internodes distally pubescent. Leaf-sheaths mostly shorter than adjacent culm internode; puberulous. Ligule an eciliate membrane; 1–2 mm long; erose. Leaf-blades flat, or involute; 2–5 cm long; 1–1.5 mm wide. Leaf-blade surface scabrous; rough abaxially; glabrous, or puberulous; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 5–12 cm long; 3–6 cm wide; 0.33–0.5 of culm length. Primary panicle branches ascending, or spreading.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; 2–5 mm long.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 1.5–1.8 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 0.8–1.5 mm long; 1 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface hirsute. Lower glume hairs 0.5 mm long. Lower glume apex acute, or acuminate. Upper glume lanceolate; 0.8–1.5 mm long; 0.5–0.8 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume surface hirsute. Upper glume apex acute, or acuminate.

FLORETS Fertile lemma lanceolate; 1.5–1.8 mm long; membranous; without keel; 3 -veined. Lemma midvein pubescent; hairy below. Lemma surface glabrous. Lemma margins pubescent; hairy below. Lemma apex dentate; 2 -fid; acuminate; mucronate, or awned; 1 -awned. Principal lemma awn from a sinus; 0.1–0.3 mm long overall. Palea 1 length of lemma; 2 -veined. Palea surface puberulous; hairy on back.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 0.4–0.5 mm long.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION North America: southwest USA, south-central USA, and Mexico.

NOTES Eragrostideae. Fl Baja Cal 1997.

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