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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 cualensis

HABIT Perennial; caespitose; clumped densely. Rhizomes absent. Culms erect; 50–70 cm long. Culm-internodes distally glabrous. Culm-nodes pubescent. Leaf-sheaths 7–34 cm long; longer than adjacent culm internode; without keel; smooth, or scaberulous. Ligule an eciliate membrane; 10–12 mm long; entire, or lacerate; acuminate. Leaf-blades flat, or involute; 11–25 cm long; 0.5–2 mm wide; stiff. Leaf-blade surface smooth, or scaberulous; rough abaxially; puberulous; hairy adaxially. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 10–15 cm long; 0.7–4 cm wide. Primary panicle branches ascending; 0.6–7 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.6–3 mm long; scaberulous, or scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3–4 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; exceeding apex of florets. Lower glume oblong; 3–4 mm long; 1 length of upper glume; membranous; dark green; without keels; 1 -veined. Lower glume primary vein ciliolate. Lower glume lateral veins absent. Lower glume apex obtuse, or acute. Upper glume oblong; 3–4 mm long; 1.1–1.3 length of adjacent fertile lemma; membranous; dark green; without keels; 1 -veined. Upper glume primary vein ciliolate. Upper glume lateral veins absent. Upper glume apex obtuse, or acute.

FLORETS Fertile lemma oblong; 2.6–3 mm long; membranous; dark green; without keel; 3 -veined. Lemma midvein ciliolate. Lemma surface pubescent; hairy below. Lemma margins ciliolate. Lemma hairs 0.2–0.4 mm long. Lemma apex acute, or acuminate; awned; 1 -awned. Principal lemma awn straight, or flexuous; 16–20 mm long overall. Palea oblong; 2.6–3 mm long; 2 -veined. Palea surface pubescent; hairy on back; hairy below. Palea apex obtuse.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 1.6–2.2 mm long; purple.

FRUIT Caryopsis with adherent pericarp; fusiform.

DISTRIBUTION North America: Mexico.

NOTES Eragrostideae. Herrera & Peterson 2002.

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