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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 flaviseta
HABIT Perennial; caespitose; clumped loosely. Cataphylls evident. Rhizomes absent, or short; scaly. Culms erect, or geniculately ascending; 15–25 cm long. Culm-internodes distally glabrous. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface. Ligule a ciliolate membrane; 0.2–0.5 mm long. Leaf-blades flat, or conduplicate; 2–10 cm long; 1–3 mm wide. Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins cartilaginous. Leaf-blade apex attenuate.
INFLORESCENCE Inflorescence a panicle.
Panicle contracted; elliptic, or ovate; 2–5 cm long. Primary panicle branches appressed, or ascending; 1–2 cm long; bearing spikelets almost to the base. Panicle axis angular; scaberulous. Panicle branches puberulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
GLUMES Glumes persistent; similar; shorter than spikelet, or reaching apex of florets. Lower glume oblong; 1.5–2 mm long; 0.4–0.5 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume oblong; 3.5–4 mm long; 0.9–1 length of adjacent fertile lemma; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.
FLORETS Fertile lemma lanceolate; 4 mm long; membranous; without keel; 3 -veined. Lemma surface scaberulous. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn flexuous; 10–15 mm long overall. Palea 1 length of lemma; 2 -veined.
FLOWER Lodicules 2; cuneate; fleshy. Anthers 3.
FRUIT Caryopsis with adherent pericarp; fusiform.
DISTRIBUTION North America: Mexico.
NOTES Eragrostideae. N Amer Fl 1994.
ADDITIONAL CHARACTERS Awn yellow.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.