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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 aquarii

HABIT Perennial; caespitose. Rhizomes short. Culms 50–100 cm long; 1.5 mm diam.; 5–6 -noded. Culm-internodes distally glabrous, or pubescent. Culm-nodes pubescent. Lateral branches lacking. Leaf-sheaths antrorsely scabrous; glabrous on surface, or hirsute; outer margin glabrous, or hairy. Leaf-sheath oral hairs ciliate. Ligule a ciliolate membrane; 1–2 mm long; pubescent on abaxial surface; obtuse. Leaf-blades convolute; 30–60 cm long; 1–2 mm wide. Leaf-blade surface ribbed; scabrous; rough abaxially; pubescent; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 14–20 cm long; 1 cm wide. Primary panicle branches 1–3 cm long. Panicle axis scaberulous. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–4 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 10–12 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; curved; 1 mm long; pubescent; acute.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 10–12 mm long; 1 length of upper glume; hyaline; without keels; 3 -veined. Lower glume primary vein scaberulous. Lower glume apex acuminate. Upper glume lanceolate; 9–10 mm long; hyaline; without keels; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; subterete; 3.5–5 mm long; coriaceous; dark brown; without keel; 5 -veined. Lemma surface scaberulous; rough above; pilose; hairy below. Lemma margins convolute; covering most of palea. Lemma hairs yellow. Lemma apex awned; 1 -awned. Principal lemma awn bigeniculate; 40–50 mm long overall; with twisted column; limb limb ciliate; glabrescent towards tip. Middle segment of lemma awn 3–4 mm long; hirtellous. Column of lemma awn 7–9 mm long; hirtellous; with 0.8–1.3 mm long hairs. Palea 0.9 length of lemma; 2 -veined; without keels.

FLOWER Lodicules 2; 0.7 mm long. Anthers 3; 0.8 mm long; anther tip smooth. Stigmas 2. Styles free to the base.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION Australasia: Australia.

NOTES Stipeae. Vickery etc 1994.

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