GrassBase - The Online World Grass Flora


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

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

Stipa vatroensis

HABIT Perennial; caespitose. Rhizomes elongated. Stolons present. Butt sheaths dark brown; pubescent. Culms 40–50 cm long; 3–4 -noded. Culm-internodes smooth, or scaberulous; distally pubescent. Culm-nodes brown; glabrous. Leaf-sheaths mostly shorter than adjacent culm internode, or longer than adjacent culm internode; pilose. Leaf-sheath oral hairs ciliate. Ligule an eciliate membrane; 6 mm long; 1 mm long on basal shoots. Leaf-blades flexuous; filiform; conduplicate; 10–15 cm long; 1 mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade apex acuminate; hardened.

INFLORESCENCE Inflorescence a panicle; comprising 20–25 fertile spikelets.

Panicle open; linear; 20–25 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.5–4 mm long; villous; hairy at tip; with 3 mm long hairs.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 36–45 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 2.5–3 mm long; pubescent; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 36–45 mm long; 1.1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex attenuate. Upper glume lanceolate; 34–40 mm long; membranous; without keels; 3 -veined. Upper glume apex attenuate.

FLORETS Fertile lemma lanceolate; subterete; 14–18 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent. Lemma margins convolute; covering most of palea. Lemma apex awned; 1 -awned. Principal lemma awn geniculate; 100–165 mm long overall; with twisted column. Column of lemma awn 7–21 mm long; hirsute; hairy on lower part. Palea 9–13 mm long; 0.5 length of lemma; 2 -veined; without keels. Palea surface pubescent.

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

FRUIT Caryopsis with adherent pericarp; fusiform; 9 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.