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Descriptions

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

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

Nassella entrerriensis

HABIT Perennial; caespitose; clumped densely. Culms 30–60 cm long; 3–4 -noded. Culm-nodes constricted; pubescent. Ligule an eciliate membrane; 0.5–2 mm long; obtuse. Leaf-blades convolute; 15–25 cm long; 0.5–1 mm wide. Leaf-blade surface ribbed.

INFLORESCENCE Inflorescence a panicle; subtended by an inflated leaf-sheath; embraced at base by subtending leaf.

Panicle open; elliptic.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent; hairy above.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 21–32 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 4–4.2 mm long; bearded; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 21–32 mm long; 1.1–1.4 length of upper glume; membranous; purple; without keels; 3 -veined. Lower glume surface glabrous, or puberulous; hairy on veins. Lower glume apex acuminate. Upper glume lanceolate; 20–23 mm long; membranous; purple; without keels; 5–6 -veined. Upper glume surface glabrous, or puberulous; hairy on veins. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; subterete; 9–12.5 mm long; coriaceous; without keel; 5 -veined. Lemma surface tuberculate; rough above; pubescent; hairy below; hairy on veins. Lemma margins convolute; covering most of palea. Lemma apex with a membranous corona and surmounted by a ring of hairs; with this appendage 1–1.5 mm long; awned; 1 -awned. Principal lemma awn geniculate; 75–95 mm long overall; with twisted column. Column of lemma awn 15–25 mm long; pubescent. Palea 2 mm long; without keels.

FLOWER Anthers 3; 5 mm long; anther tip penicillate. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; fusiform. Hilum linear.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Fl Entre Rios 1995.

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