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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 sobolifera

HABIT Perennial; culms solitary, or caespitose. Rhizomes elongated; scaly. Culms erect, or geniculately ascending; 60–100 cm long. Culm-internodes distally pubescent. Culm-nodes glabrous. Lateral branches sparse. Leaf-sheaths outer margin glabrous, or hairy. Ligule an eciliate membrane; 0.5–1 mm long. Leaf-blades spreading; 7–15 cm long; 4–8 mm wide. Leaf-blade venation with 7–9 secondary veins. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle. Peduncle pubescent above.

Panicle contracted; linear; equilateral, or nodding; 6–20 cm long; 0.3 cm wide. Primary panicle branches appressed; bearing spikelets almost to the base.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 2–2.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 1.1–1.8 mm long; 0.8–0.9 length of upper glume; membranous; without keels; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 1.4–1.9 mm long; 0.66 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume apex acuminate.

FLORETS Fertile lemma elliptic; 2–2.5 mm long; membranous; without keel; 3 -veined. Lemma surface pubescent; hairy below. Lemma apex obtuse; mucronate. Palea 1 length of lemma; 2 -veined.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 0.7–0.8 mm long.

FRUIT Caryopsis with adherent pericarp; fusiform; 1.2–1.4 mm long.

DISTRIBUTION North America: north-central USA, northeast USA, south-central USA, and southeast USA.

NOTES Eragrostideae. Gr Indiana 1994.

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