|
Note - this takes you off
of our website |
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 cordobensis
HABIT Perennial; caespitose. Rhizomes short. Basal innovations extravaginal. Culms erect; 30–110 cm long. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 2–6 mm long; obtuse. Leaf-blades filiform; convolute; 10–35 cm long; 0.6–1 mm wide. Leaf-blade surface smooth; puberulous; hairy adaxially.
INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.
Panicle open; linear; equilateral; 15–35 cm long; bearing few spikelets.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 11–22 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1.5–2.2 mm long; pubescent; pungent.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 11–22 mm long; 1 length of upper glume; hyaline; pallid, or purple; without keels; 3–5 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume margins eciliate, or ciliate. Lower glume apex setaceously attenuate. Upper glume lanceolate; 11–22 mm long; 1.5–2 length of adjacent fertile lemma; hyaline; pallid, or purple; without keels; 3–5 -veined. Upper glume apex setaceously attenuate.
FLORETS Fertile lemma linear; subterete; 6.8–9.5 mm long; chartaceous; without keel; 5 -veined. Lemma surface papillose; glabrous. Lemma margins convolute; covering most of palea. Lemma apex with a membranous corona and surmounted by a ring of hairs (on membrane); with this appendage 0.5–0.8 mm long (plus hairs 0.5mm); awned; 1 -awned. Principal lemma awn bigeniculate; simple at base; 45–88 mm long overall; with 30–60 mm long limb; with twisted column. Column of lemma awn 11–19 mm long; puberulous. Palea 2 mm long; 0 -veined; without keels.
FLOWER Lodicules 2. Anthers 3; 4–5 mm long; anther tip penicillate. Stigmas 2. Ovary glabrous.
FRUIT Caryopsis with adherent pericarp; fusiform; 4–7 mm long; light brown. Hilum linear; 1 length of caryopsis.
DISTRIBUTION South America: southern South America.
NOTES Stipeae. Torres 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
