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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 ragonesei

HABIT Perennial; caespitose; clumped loosely. Basal innovations intravaginal. Culms erect, or geniculately ascending; 40–65 cm long. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane. Collar glabrous. Leaf-blades filiform, or linear; flat, or convolute; 8–15 cm long; 2–3 mm wide. Leaf-blade surface glabrous. Leaf-blade margins ciliate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic; 10–25 cm long. Panicle axis scaberulous; glabrous. Panicle branches pubescent.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 25–29 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 3–4 mm long; pubescent (tawny); pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 20–25 mm long; 0.75–0.9 length of upper glume; membranous; without keels; 3 -veined. Lower glume apex attenuate. Upper glume lanceolate; 25–29 mm long; membranous; without keels; 3 -veined. Upper glume apex attenuate.

FLORETS Fertile lemma linear; subterete; 11–12 mm long; coriaceous; without keel; 5 -veined. Lemma surface asperulous; pubescent. Lemma margins convolute; covering most of palea. Lemma apex with a membranous corona and surmounted by a ring of hairs; with this appendage 1–1.3 mm long; awned; 1 -awned. Principal lemma awn bigeniculate; constricted at base (of corona); 90–100 mm long overall; with 40–60 mm long limb; with twisted column; persistent. Column of lemma awn 18–20 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. Torres 1997.

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