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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 bronwenae

HABIT Perennial. Culms 90–150 cm long. Leaf-sheaths glabrous on surface; outer margin glabrous, or hairy. Leaf-sheath auricles erect. Ligule an eciliate membrane, or absent; 0–1(–2) mm long. Leaf-blades erect; filiform; involute, or convolute; 35–45 cm long; 0.5–0.8 mm wide; stiff. Leaf-blade surface ribbed; grooved adaxially; pubescent; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 25–30 cm long; 3–4 cm wide. Primary panicle branches 8–12 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 3–13 mm long; scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 11–13 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 1.5–1.8 mm long; pubescent; acute. Floret callus hairs 0.4–1 mm long (tawny).

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 11–13 mm long; 1 length of upper glume; membranous; without keels; 3 -veined. Lower glume apex acuminate. Upper glume lanceolate; 11–12 mm long; membranous; without keels; 3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; subterete; 7–8 mm long; coriaceous; without keel. Lemma surface pubescent. Lemma margins convolute; covering most of palea. Lemma hairs tawny; 0.5–0.6 mm long. Lemma apex dentate; 2 -fid; with lobes 0.3–1 mm long; awned; 1 -awned. Principal lemma awn bigeniculate; 42–55 mm long overall; with twisted column. Middle segment of lemma awn 8–9 mm long. Column of lemma awn 11–12 mm long; puberulous; with 0.2–0.4 mm long hairs. Palea 1 length of lemma; without keels. Palea surface pubescent; hairy on back.

FLOWER Lodicules 3; ovate; 1–1.2 mm long. Anthers 3; 4.2–5 mm long; anther tip penicillate.

FRUIT Caryopsis with adherent pericarp; fusiform; 4.1–4.6 mm long. Embryo 0.25 length of caryopsis. Hilum linear; 0.75 length of caryopsis.

DISTRIBUTION Australasia: Australia.

NOTES Stipeae. Williams 2011.

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