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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Nassella pampeana
HABIT Perennial; caespitose. Culms erect; slender; 25–60 cm long. Culm-internodes distally pubescent (below nodes). Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 3–10 mm long; acute. Leaf-blades filiform; 5–20 cm long; 0.5–1 mm wide; stiff. Leaf-blade surface smooth, or scaberulous. Leaf-blade apex pungent.
INFLORESCENCE Inflorescence a panicle; exserted, or embraced at base by subtending leaf.
Panicle open, or contracted; linear; equilateral; 6–10 cm long; bearing few spikelets.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 6–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.5–1 mm long; bearded; acute. Floret callus hairs 4–5 mm long; 0.6–1.4 length of lemma.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 6–8 mm long; 1 length of upper glume; hyaline; purple; without keels; 3 -veined. Lower glume apex attenuate. Upper glume lanceolate; 6–8 mm long; 2–3 length of adjacent fertile lemma; hyaline; purple; without keels; 3 -veined. Upper glume apex attenuate.
FLORETS Fertile lemma obovate; laterally compressed; gibbous; 2.5–3.5 mm long; chartaceous, or coriaceous; without keel; 5 -veined. Lemma surface asperulous; rough above; glabrous. Lemma margins convolute; covering most of palea. Lemma apex surmounted by a ring of hairs; with this appendage 1–2 mm long (on membrane 0.1–0.2mm); awned; 1 -awned. Principal lemma awn eccentric; bigeniculate; 23–38 mm long overall; with 12–14 mm long limb; with twisted column; deciduous. Column of lemma awn 9–10 mm long; glabrous. Palea 1–1.5 mm long; 0 -veined; without keels.
FLOWER Lodicules 2. Anthers 3; 1.8–2 mm long; anther tip penicillate. Stigmas 2. Ovary glabrous.
FRUIT Caryopsis with adherent pericarp; obovoid; 2–2.5 mm long; dark brown. 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.
