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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 chrysophylla

HABIT Perennial; caespitose. Stolons present. Butt sheaths yellow; glabrous, or pubescent. Culms erect, or geniculately ascending; 15–40 cm long; 2–4 -noded. Culm-internodes distally glabrous, or pubescent. Culm-nodes glabrous. Ligule an eciliate membrane; 5 mm long. Leaf-blades filiform; conduplicate; 10–30 cm long; 0.5 mm wide. Leaf-blade surface scaberulous; glabrous. Leaf-blade apex hardened.

INFLORESCENCE Inflorescence a panicle; comprising 10–20 fertile spikelets.

Panicle open; linear; dense; 6–9 cm long; 0.5–1 cm wide.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 5–10 mm long; scabrous; ciliate; hairy at tip.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 14–29 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1.5–2 mm long; pubescent; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 14–29 mm long; 1.05 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume apex acuminate. Upper glume lanceolate; 13–28 mm long; membranous; without keels; 3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; subterete; 6–11 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent; hairy all along, or below. Lemma margins convolute; covering most of palea. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 25–60 mm long overall; with twisted column. Column of lemma awn 10–22 mm long; plumose; hairy generally; with 5–10 mm long hairs. Palea 5–6 mm long; 0.75 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; 6–7 mm long. Hilum linear.

DISTRIBUTION South America: western South America and southern South America.

NOTES Stipeae. Fl Pat 1995.

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