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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 pseudopampagrandensis

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; 30–40 cm long; 3 -noded. Culm-internodes terete; scaberulous. Culm-nodes swollen; glabrous. Lateral branches lacking. Leaf-sheaths scaberulous. Ligule an eciliate membrane; 1.5–4 mm long; scaberulous on abaxial surface; obtuse. Leaf-blades filiform; convolute; 2.5–20 cm long; 0.3–0.5 mm wide. Leaf-blade surface ribbed; scaberulous; rough abaxially; puberulous; densely hairy; hairy adaxially.

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

Panicle contracted; linear; 12–15 cm long. Primary panicle branches 2 -nate. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 8–9 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief; 0.3 mm long; pubescent; acute.

GLUMES Glumes persistent; similar; with lower wider than upper; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 8–9 mm long; 1.3–1.6 length of upper glume; membranous; dark brown; without keels; 3 -veined. Lower glume apex setaceously attenuate. Upper glume lanceolate; 5–7 mm long; membranous; dark brown; without keels; 3 -veined. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma obovate; laterally compressed; gibbous; 2 mm long; coriaceous; without keel; 5 -veined. Lemma midvein ciliolate. Lemma surface papillose. Lemma margins convolute; covering most of palea. Lemma apex surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn eccentric; geniculate, or bigeniculate; simple at base; 55–70 mm long overall; with a straight or slightly twisted column. Middle segment of lemma awn 5–8 mm long. Column of lemma awn 14–20 mm long. Palea 0.8 mm long; 0 -veined; without keels.

FLOWER Lodicules 2; 0.4 mm long. Anthers 3. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; obovoid; 1.5 mm long; dark brown. Hilum linear; 0.66 length of caryopsis.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Caro 1995.

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