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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 nubicola

HABIT Perennial; caespitose. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms erect; 15–25 cm long; 1–1.25 mm diam.; 1–2 -noded. Culm-internodes smooth; distally glabrous. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane. Leaf-blades convolute; 3–10 cm long; 1.5–3 mm wide; stiff; dark green. Leaf-blade surface smooth; glabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle; comprising 15–25 fertile spikelets; embraced at base by subtending leaf.

Panicle open; linear, or elliptic; 7.5–10 cm long. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 3–15 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 13–14 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 1.25–1.5 mm long; pubescent; acute.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume elliptic; 13–14 mm long; 1.1 length of upper glume; membranous; purple; 1-keeled; 3 -veined. Lower glume apex attenuate. Upper glume elliptic; 12–13 mm long; membranous; purple; 1-keeled; 3 -veined. Upper glume apex attenuate.

FLORETS Fertile lemma linear; subterete; 6.75–7 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent. Lemma margins convolute; covering most of palea. Lemma apex with a membranous corona and surmounted by a ring of hairs; with this appendage 0.35–0.5 mm long; awned; 1 -awned. Principal lemma awn bigeniculate; constricted at base (of corona); 25–30 mm long overall; with 12–15 mm long limb; with twisted column; persistent. Middle segment of lemma awn 6–7 mm long. Column of lemma awn 6–7 mm long; pubescent. Palea 0 -veined; without keels.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Speg 1997.

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