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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 juncoides

HABIT Perennial; caespitose. Culms erect; slender; 30–55 cm long. Culm-internodes distally glabrous. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 0.5–4 mm long; bilobed. Leaf-blades persistent, or deciduous at the ligule; terete; 5–10 cm long; 0.4–0.8 mm wide; stiff. Leaf-blade surface smooth; glabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; loose; 8–25 cm long; bearing many spikelets, or few spikelets.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 11–17 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1–2 mm long; pubescent; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 11–17 mm long; 1.1 length of upper glume; hyaline; pallid; without keels; 3 -veined. Lower glume apex setaceously attenuate. Upper glume lanceolate; 11–17 mm long; 2 length of adjacent fertile lemma; hyaline; pallid; without keels; 3 -veined. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma linear; subterete; 5–7(–7.5) mm long; chartaceous; without keel; 5 -veined. Lemma surface papillose; rough above; pubescent; hairy below. Lemma margins convolute; covering most of palea. Lemma apex surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn bigeniculate; 50–80 mm long overall; with 38–60 mm long limb; with twisted column. Column of lemma awn 8–12 mm long; glabrous. Palea 1.2–2 mm long; 2 -veined; without keels.

FLOWER Lodicules 3. Anthers 3; 2–3.5 mm long; anther tip penicillate. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; fusiform; 4–5 mm long. Hilum linear; 0.66 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.