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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 hypsophila

HABIT Perennial; caespitose. Culms erect; 15–50 cm long. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs woolly. Ligule an eciliate membrane; 0.2–0.5 mm long; pubescent on abaxial surface. Leaf-blades deciduous at the ligule; filiform; convolute; 2.5–10 cm long; 0.5–0.7 mm wide; stiff. Leaf-blade surface glabrous. Leaf-blade apex acute; pungent.

INFLORESCENCE Inflorescence a panicle.

Panicle open; nodding; 10–15 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 7–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 0.7–1 mm long; pubescent; acute.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 7–10 mm long; 1 length of upper glume; hyaline; without keels; 1–3 -veined. Lower glume lateral veins absent, or distinct. Lower glume apex attenuate. Upper glume lanceolate; 7–10 mm long; 2 length of adjacent fertile lemma; hyaline; without keels; 1–3 -veined. Upper glume lateral veins absent, or distinct. Upper glume apex attenuate.

FLORETS Fertile lemma linear; subterete; 4–5 mm long; coriaceous; without keel; 5 -veined. Lemma surface smooth, or asperulous; rough above; pubescent; hairy below. Lemma margins convolute; covering most of palea. Lemma apex dentate; 2 -fid; with lobes 0.3–0.4 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate, or bigeniculate; 32–55 mm long overall; with 20–39 mm long limb; with twisted column. Column of lemma awn 5–10 mm long; glabrous. Palea 1.4–1.8 mm long; 2 -veined; without keels.

FLOWER Lodicules 2. Anthers 3; 1.5 mm long; anther tip penicillate. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; fusiform; 2.8–3 mm long; dark brown. Hilum linear; 0.5 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.