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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 planaltina

HABIT Perennial; caespitose. Rhizomes absent, or short. Culms 25–65 cm long; 3–6 -noded. Leaf-sheaths smooth; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs ciliate; 1.5 mm long. Ligule an eciliate membrane; 0.1–0.3 mm long; erose; truncate. Leaf-blades flat, or conduplicate; 4–25 cm long; 0.5–1.5 mm wide. Leaf-blade surface smooth, or scaberulous; rough adaxially; glabrous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; 4–14 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 14–20 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1.5–2.7 mm long; pubescent; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume linear; 14–20 mm long; 1.1 length of upper glume; membranous; without keels; 3 -veined. Lower glume surface smooth, or asperulous; rough on veins. Lower glume apex acuminate. Upper glume linear; 13.5–16 mm long; 2–2.2 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume surface smooth, or asperulous; rough on veins. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; subterete; 6.5–9 mm long; coriaceous; yellow; without keel; 5 -veined. Lemma surface papillose; pubescent; hairy on veins. Lemma margins convolute; covering most of palea. Lemma apex with a membranous corona and surmounted by a ring of hairs; with this appendage 0.5–1 mm long; awned; 1 -awned. Principal lemma awn bigeniculate; 30–60 mm long overall; with twisted column. Palea 0.7–1.4 mm long; 0 -veined; without keels.

FLOWER Lodicules 3. Anthers 3; 2.5–4 mm long; yellow, or red; anther tip penicillate. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; 3.5–4 mm long. Hilum linear.

DISTRIBUTION South America: Brazil.

NOTES Stipeae. H.L-W 1996.

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