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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 vallsii
HABIT Perennial; caespitose. Rhizomes absent, or short. Culms 34–65 cm long; 3–6 -noded. Culm-internodes distally glabrous, or pubescent. Culm-nodes glabrous, or pubescent. Leaf-sheaths smooth; glabrous on surface, or pubescent; outer margin hairy. Leaf-sheath oral hairs ciliate; 0.5–1 mm long. Ligule an eciliate membrane; 0.2–0.4 mm long; erose; truncate. Leaf-blades flat, or convolute; 3–17 cm long; 1–4 mm wide. Leaf-blade surface glabrous to pubescent. Leaf-blade apex attenuate.
INFLORESCENCE Inflorescence a panicle.
Panicle open; oblong; 5.5–15 cm long.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 15–19 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 2–3 mm long; pubescent; pungent.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume linear; 15–19 mm long; 1.1 length of upper glume; membranous; without keels; 3 -veined. Lower glume surface smooth, or asperulous. Lower glume apex acuminate. Upper glume linear; 13.5–17.5 mm long; 1.7–1.8 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume surface smooth, or asperulous. Upper glume apex acuminate.
FLORETS Fertile lemma lanceolate; subterete; 7.5–10 mm long; coriaceous; yellow; without keel; 5 -veined. Lemma midvein ciliolate; hairy below. Lemma surface scabrous; rough above. 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 bigeniculate; 35–60 mm long overall; with twisted column. Column of lemma awn glabrous. Palea 1.2–2 mm long; 0 -veined; without keels.
FLOWER Lodicules 2. Anthers 3; 3–5 mm long; yellow, or red. Stigmas 2. Ovary glabrous.
FRUIT Caryopsis with adherent pericarp; linear; 3.5–4 mm long. Hilum linear.
DISTRIBUTION South America: Brazil.
NOTES Stipeae. H.L-W 1996.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
