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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 stuposa

HABIT Perennial; short-lived; caespitose. Butt sheaths pubescent; persistent and investing base of culm; with fibrous dead sheaths. Culms erect, or geniculately ascending; 80–140 cm long; 2–3.5 mm diam.; 3–5 -noded. Culm-nodes pubescent. Leaf-sheaths pubescent; outer margin hairy. Leaf-sheath oral hairs ciliate. Ligule a ciliate membrane; 0.3 mm long. Leaf-blades convolute; 19–30 cm long; 2–5 mm wide; stiff. Leaf-blade surface ribbed; pubescent; hairy adaxially. Leaf-blade apex attenuate; hardened.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 17–35 cm long; 7 cm wide. Primary panicle branches 5–10 cm long. Panicle axis puberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–8 mm long; scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 18–24 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; 3 mm long; pubescent; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; gaping. Lower glume lanceolate; 18–24 mm long; 1.2 length of upper glume; membranous; without keels; 3 -veined. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 15–20 mm long; membranous; without keels; 5 -veined. Upper glume surface scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; subterete; 7.6–11.5 mm long; cartilaginous; dark brown; without keel. Lemma surface tuberculate; pubescent. Lemma margins flat; covering most of palea. Lemma hairs white. Lemma apex surmounted by a ring of hairs; with this appendage 1.5–3 mm long; awned; 1 -awned. Principal lemma awn bigeniculate; 50–65 mm long overall; with twisted column. Column of lemma awn 19–36 mm long; hirsute. Palea 1 length of lemma; 2 -veined; without keels. Palea surface pubescent.

FLOWER Lodicules 3; 1–3 mm long. Anthers 4–6 mm long; anther tip penicillate. Stigmas 2.

DISTRIBUTION Australasia: Australia and New Zealand.

NOTES Stipeae. Townrow 1994.

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