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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 sanluisensis

HABIT Perennial; caespitose. Culms erect; 30–100 cm long. Culm-internodes distally pubescent. Lateral branches lacking. Leaf-sheaths scaberulous; glabrous on surface. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 6–10 mm long; acute. Leaf-blades filiform; convolute; 5.5–60 cm long; 0.5–0.7 mm wide. Leaf-blade surface scaberulous; rough abaxially; puberulous; hairy adaxially. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence a panicle.

Panicle open; equilateral; 5–30 cm long. Primary panicle branches appressed, or ascending.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 4–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 0.2 mm long; pilose; acute.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 4–7 mm long; 1.1–1.3 length of upper glume; hyaline; without keels; 3 -veined. Lower glume apex setaceously attenuate. Upper glume lanceolate; 4–7 mm long; 2–3 length of adjacent fertile lemma; hyaline; without keels; 3 -veined. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma elliptic; laterally compressed; 1.8–3 mm long; coriaceous; yellow, or light brown; shiny; without keel; 5 -veined. Lemma midvein pubescent; hairy below. Lemma surface smooth, or papillose; rough above; glabrous. Lemma margins convolute; covering most of palea. Lemma apex with a membranous corona; with this appendage 0.1–0.2 mm long; awned; 1 -awned. Principal lemma awn geniculate, or bigeniculate; simple at base; 20–35 mm long overall; with a straight or slightly twisted column; persistent, or deciduous. Column of lemma awn glabrous. Palea 0.6–0.7 mm long; 0 -veined; without keels.

FLOWER Lodicules 2, or 3. Anthers 3; 1.2–1.5 mm long; anther tip penicillate. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1.5 mm long. Hilum linear; 0.5 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.