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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 catamarcensis

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; slender; 35–40 cm long. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths mostly shorter than adjacent culm internode; striately veined; smooth; glabrous on surface. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 1.5 mm long. Leaf-blades filiform; convolute; 12–15 cm long; 0.3–0.5 mm wide. Leaf-blade surface scaberulous; glabrous.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.

Panicle contracted; linear; 8–10 cm long; bearing few spikelets.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 14–24 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1.2–1.5 mm long; pubescent; acute.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 14–24 mm long; 1 length of upper glume; membranous; without keels; 3 -veined. Lower glume apex attenuate. Upper glume lanceolate; 14–24 mm long; membranous; without keels; 3 -veined. Upper glume apex attenuate.

FLORETS Fertile lemma elliptic; subterete; 4.5–5.5 mm long; coriaceous; without keel; 5 -veined. Lemma midvein pubescent; hairy below. Lemma surface scaberulous and papillose; glabrous. Lemma margins convolute; covering most of palea. Lemma apex with a membranous corona and surmounted by a ring of hairs; with this appendage 1.2–1.4 mm long; awned; 1 -awned. Principal lemma awn bigeniculate; constricted at base (of corona); 70–90 mm long overall; with 50–55 mm long limb; with twisted column; persistent. Column of lemma awn 20–25 mm long; puberulous. Palea 1.4 mm long; 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. Torres 1997.

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