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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.
Nassella ibarrensis
HABIT Perennial; caespitose. Culms erect; 30–70 cm long. Lateral branches lacking. Ligule an eciliate membrane. Leaf-blades 5–12 cm long; 1–2 mm wide.
INFLORESCENCE Inflorescence a panicle.
Panicle open; linear; 10–20 cm long.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 8–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus 0.5 mm long; pilose; acute.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 8–10 mm long; 1 length of upper glume; hyaline; purple; without keels. Lower glume apex acuminate. Upper glume lanceolate; 8–10 mm long; hyaline; purple; without keels. Upper glume apex acuminate.
FLORETS Fertile lemma linear; subterete; 4 mm long; coriaceous; without keel; 5 -veined. Lemma surface pilose. Lemma margins convolute; covering most of palea. Lemma apex truncate; surmounted by a ring of hairs; with this appendage 1 mm long; awned; 1 -awned. Principal lemma awn geniculate, or bigeniculate; 15–20 mm long overall; with twisted column. Palea 0 -veined; without keels.
FLOWER Anthers 3. Stigmas 2.
FRUIT Caryopsis with adherent pericarp; fusiform. Hilum linear.
DISTRIBUTION South America: western South America.
NOTES Stipeae. WDC 1997.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.