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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 ibarii

HABIT Perennial; caespitose. Butt sheaths yellow. Culms erect, or geniculately ascending; 7–20 cm long; 0.5 mm diam.; 1–2 -noded. Culm-internodes distally pubescent. Culm-nodes swollen; pubescent. Leaf-sheaths mostly shorter than adjacent culm internode; pubescent. Leaf-sheath oral hairs ciliate. Ligule a ciliolate membrane; 0.5 mm long. Leaf-blades straight, or curved; conduplicate; 3–10 cm long; 0.5 mm wide. Leaf-blade surface pubescent. Leaf-blade apex hardened.

INFLORESCENCE Inflorescence a panicle; comprising 4–15 fertile spikelets; embraced at base by subtending leaf.

Panicle open; oblong; 4–9 cm long; bearing few spikelets.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–7 mm long; ciliate.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 17–23 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; pubescent; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 17–23 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein eciliate, or ciliolate. Lower glume apex acuminate. Upper glume lanceolate; 17–23 mm long; membranous; 1-keeled; 3 -veined. Upper glume primary vein eciliate, or ciliolate. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; subterete; 7–9 mm long; coriaceous; without keel; 5 -veined. Lemma surface pilose. Lemma margins convolute; covering most of palea. Lemma hairs 1 mm long. Lemma apex dentate; 2 -fid; with lobes 1 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 21–44 mm long overall; with twisted column. Column of lemma awn 7–14 mm long; plumose. Palea 1 length of lemma; 2 -veined; without keels.

FLOWER Lodicules 3. Anthers 3; anther tip smooth. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; fusiform; 6–7 mm long. Hilum linear.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Fl Pat 1995.

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