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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Stipa durifolia

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; 40–70 cm long. Culm-internodes distally glabrous. Leaf-sheaths mostly shorter than adjacent culm internode; smooth; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs lacking. Ligule a ciliolate membrane; 1 mm long. Collar glabrous. Leaf-blades filiform; convolute; 10–25 cm long; 0.5–1 mm wide; stiff. Leaf-blade surface glabrous; hairless except near base. Leaf-blade apex pungent.

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

Panicle contracted; linear; 10–12 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 4.5–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief; 0.2–0.3 mm long; glabrous, or sparsely hairy; obtuse.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 4.5–7 mm long; 1 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex attenuate. Upper glume lanceolate; 4.5–7 mm long; membranous; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume apex attenuate.

FLORETS Fertile lemma lanceolate; subterete; 3–3.7 mm long; chartaceous; without keel; 5 -veined. Lemma surface pubescent; with conspicuous apical hairs. Lemma margins convolute; exposing palea. Lemma apex awned; 1 -awned. Principal lemma awn flexuous; 8–12 mm long overall; deciduous. Palea 1.2–1.4 mm long; 0 -veined; without keels. Palea surface puberulous; hairy on back.

FLOWER Lodicules 2. Anthers 1; anther tip penicillate.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 2.7–2.9 mm long. Hilum linear; 0.66 length of caryopsis.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Nicora 1997.

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