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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 dongicola

HABIT Perennial; caespitose. Rhizomes short. Basal innovations extravaginal. Culms 100 cm long; 1.3–2.2 mm diam.; 3–4 -noded. Culm-internodes distally pubescent. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths loose; glabrous on surface. Ligule an eciliate membrane; 0.8–1.5 mm long; pubescent on abaxial surface; truncate, or obtuse. Leaf-blades straight, or flexuous; flat, or involute; 15–35 cm long; 3–4 mm wide. Leaf-blade surface pubescent; hairy on both sides.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; 14–30 cm long; 1–6 cm wide. Primary panicle branches 2–5 cm long. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–11 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 7–12 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 1.5–2 mm long; pubescent; obtuse.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume oblong; 7–12 mm long; 1 length of upper glume; membranous; purple; without keels; 3 -veined. Lower glume apex acuminate. Upper glume oblong; 8–11 mm long; membranous; purple; without keels; 5 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; subterete; 5–6.5 mm long; coriaceous; dark brown; without keel; 5 -veined. Lemma surface scabrous; pubescent. Lemma margins convolute; covering most of palea. Lemma hairs white, or yellow. Lemma apex with a short cylindrical neck and surmounted by a ring of hairs; with this appendage 0.7 mm long (as to hairs); awned; 1 -awned. Principal lemma awn bigeniculate; 30–40 mm long overall; with twisted column. Middle segment of lemma awn 5 mm long. Column of lemma awn 10 mm long; hirtellous; with 0.5–1.5 mm long hairs. Palea 1 length of lemma; 2 -veined; without keels.

FLOWER Lodicules 3; 0.4–0.6 mm long. Anthers 3; 3.5 mm long; anther tip penicillate. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; 3–3.5 mm long. Embryo 0.33 length of caryopsis. Hilum linear; 0.75 length of caryopsis.

DISTRIBUTION Australasia: Australia.

NOTES Stipeae. Vickery etc 1994.

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