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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 subaristata

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; 35–60 cm long; 2 -noded. Lateral branches lacking. Leaf-sheaths striately veined; glabrous on surface. Ligule a ciliolate membrane; 0.3 mm long. Leaf-blades straight; filiform; conduplicate; 10–30 cm long; 0.5–0.8 mm wide; stiff. Leaf-blade surface ribbed; grooved adaxially; scabrous; rough on both sides. Leaf-blade margins smooth. Leaf-blade apex pungent.

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

Panicle spiciform; linear; 6–9 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 7–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief; 0.3 mm long; glabrous; acute.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 7–8 mm long; 1 length of upper glume; hyaline; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 7–8 mm long; hyaline; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; subterete; 3–3.5 mm long; coriaceous; without keel; 5 -veined. Lemma surface pubescent; with conspicuous apical hairs (on neck). Lemma margins convolute; covering most of palea. Lemma hairs 3 mm long. Lemma apex with a short cylindrical neck; with this appendage 0.5–0.7 mm long; awned; 1 -awned. Principal lemma awn bigeniculate; 4–10 mm long overall; with 2.5–7 mm long limb; with twisted column. Middle segment of lemma awn 1–1.5 mm long. Column of lemma awn 0.5–1.5 mm long. Palea 1 mm long; 2 -veined; without keels.

FLOWER Lodicules 2; 0.6 mm long.

FRUIT Caryopsis with adherent pericarp; fusiform; isodiametric; 2–2.5 mm long; dark brown. Hilum linear; 0.5 length of caryopsis.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Caro 1997.

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