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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 hystricina

HABIT Perennial; caespitose. Culms erect; 15–20 cm long; 0.75–1.25 mm diam. Culm-internodes smooth; distally glabrous. Culm-nodes glabrous. Leaf-sheaths smooth; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule a fringe of hairs. Leaf-blades straight, or tortuous; aciculate, or filiform; conduplicate; 5–10 cm long; 0.75–1 mm wide; stiff; light green. Leaf-blade venation with 6–10 secondary veins. Leaf-blade surface ribbed; grooved adaxially; scaberulous; rough adaxially. Leaf-blade apex abruptly acute; pungent.

INFLORESCENCE Inflorescence a panicle; subtended by an inflated leaf-sheath; exserted, or embraced at base by subtending leaf.

Panicle spiciform; linear; 5–10 cm long; 0.5–1 cm wide. Panicle axis smooth.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 5.5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief; 0.15 mm long; glabrous; obtuse.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume linear; 5.5–6 mm long; 1 length of upper glume; hyaline; pallid, or purple; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex setaceously attenuate. Upper glume linear; 5.5–6 mm long; hyaline; pallid, or purple; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma lanceolate; subterete; 4–4.5 mm long; membranous; without keel; 5 -veined. Lemma surface puberulous. Lemma margins convolute; covering most of palea. Lemma apex surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn geniculate; 14–15 mm long overall; with a straight or slightly twisted column; deciduous. Column of lemma awn glabrous. Palea 0.25 length of lemma; 0 -veined; without keels. Palea apex obtuse.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Spegazzini 1997.

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