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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 longiglumis

HABIT Perennial; caespitose. Rhizomes short. Butt sheaths sparsely hairy. Culms 50–60 cm long; 2–3 mm diam.; 2–3 -noded. Culm-internodes distally glabrous. Culm-nodes swollen; brown; glabrous. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 2–3 mm long; truncate, or obtuse. Leaf-blades flexuous; flat, or convolute; 10–20 cm long; 1.5–2 mm wide. Leaf-blade surface ribbed; scaberulous; glabrous. Leaf-blade margins ciliate. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 10–25 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 5–20 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 30–35 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 4–4.5 mm long; pubescent; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 30–35 mm long; 1.1–1.2 length of upper glume; membranous; without keels; 3 -veined. Lower glume apex attenuate. Upper glume lanceolate; 25–30 mm long; membranous; without keels; 5 -veined. Upper glume apex attenuate.

FLORETS Fertile lemma lanceolate; subterete; 10–12 mm long; coriaceous; without keel; 5 -veined. Lemma surface tuberculate; pubescent; hairy all along; hairy on veins. Lemma margins convolute; covering most of palea; ciliate. Lemma apex with a membranous corona and surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn bigeniculate; 90–125 mm long overall; with twisted column. Middle segment of lemma awn 20–25 mm long. Column of lemma awn 12–20 mm long; pubescent. Palea 2–2.5 mm long; 0 -veined; without keels.

FLOWER Lodicules 3. Anthers 3. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; fusiform; 6–7 mm long; dark brown. Hilum linear.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Fl Pat 1995.

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