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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 uspallatensis

HABIT Perennial; caespitose. Culms erect; 8–20 cm long; 0.5–0.6 mm diam. Culm-internodes smooth; distally glabrous. Culm-nodes flush with internodes; brown; glabrous. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs pubescent. Ligule an eciliate membrane; erose. Leaf-blades straight, or curved; aciculate; conduplicate; 1–4 cm long; 0.5–0.6 mm wide; stiff. Leaf-blade venation with 2–4 secondary veins. Leaf-blade surface ribbed; smooth, or scaberulous; pubescent; hairy adaxially. Leaf-blade apex abruptly acute; pungent.

INFLORESCENCE Inflorescence a panicle; subtended by an inflated leaf-sheath; exserted, or embraced at base by subtending leaf.

Panicle spiciform; linear; 4–8 cm long; 0.3–0.4 cm wide; bearing few spikelets. Panicle branches glabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–10 mm long; glabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 8–9 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5–0.75 mm long; pubescent; acute.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; shiny. Lower glume oblong; 8–9 mm long; 1.05 length of upper glume; membranous; purple; without keels; 5 -veined. Lower glume apex obtuse, or acute. Upper glume oblong; 7.5–8.5 mm long; membranous; purple; without keels; 3 -veined. Upper glume apex obtuse, or acute.

FLORETS Fertile lemma lanceolate; subterete; 5.5–6 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent. Lemma margins convolute; covering most of palea. Lemma apex with a membranous corona and surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn bigeniculate; 10–14 mm long overall; with twisted column; persistent. Middle segment of lemma awn 3 mm long. Column of lemma awn 3 mm long; pubescent. Palea 1.5 mm long; 0 -veined; without keels. Palea surface glabrous. Palea apex obtuse.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Spegazzini 1997.

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