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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 filiculmis
HABIT Perennial; caespitose. Culms erect; slender; 25–90 cm long; 0.5–0.9 mm diam. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface; outer margin hairy. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane; 1–3 mm long; obtuse. Leaf-blades straight, or curved; filiform; convolute; 10–50 cm long; 0.3–0.5 mm wide. Leaf-blade surface scaberulous; rough abaxially; puberulous; hairy adaxially. Leaf-blade apex acute; pungent.
INFLORESCENCE Inflorescence a panicle; deciduous as a whole; exserted, or embraced at base by subtending leaf. Peduncle deflexed; disarticulating; disarticulating above uppermost sheath.
Panicle open; linear; effuse; nodding; 5–20 cm long; bearing few spikelets.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 14–25 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1.5–2.5 mm long; pubescent; pungent.
GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 14–25 mm long; 1.1–1.2 length of upper glume; hyaline; without keels; 3 -veined. Lower glume surface asperulous; rough on veins. Lower glume apex setaceously attenuate. Upper glume lanceolate; 14–25 mm long; 2–3 length of adjacent fertile lemma; hyaline; without keels; 3 -veined. Upper glume surface asperulous; rough between veins. Upper glume apex setaceously attenuate.
FLORETS Fertile lemma linear; subterete; 6–9(–12) mm long; chartaceous; yellow; shiny; without keel; 5 -veined. Lemma surface papillose; rough generally, or above; glabrous. Lemma margins convolute; covering most of palea. Lemma apex awned; 1 -awned. Principal lemma awn bigeniculate; 60–90 mm long overall; with 30–45 mm long limb; with twisted column. Column of lemma awn 10–22 mm long; pubescent. Palea 2 mm long; 0 -veined; without keels.
FLOWER Lodicules 2, or 3. Anthers 3; 2–3 mm long; anther tip penicillate. Stigmas 2. Ovary glabrous.
FRUIT Caryopsis with adherent pericarp; linear; 4 mm long; dark brown. Hilum linear; 0.75 length of caryopsis.
DISTRIBUTION South America: Brazil and southern South America.
NOTES Stipeae. Torres 1994.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
