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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 hookeri

HABIT Perennial. Cataphylls evident. Rhizomes short. Butt sheaths coriaceous; persistent and investing base of culm; with compacted dead sheaths. Culms 30–70 cm long. Ligule an eciliate membrane; 2 mm long; erose; truncate. Leaf-blades involute; 10–35 cm long; 5 mm wide. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; lanceolate; 10–20 cm long. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; compressed slightly; 8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; acute; disarticulating obliquely.

GLUMES Glumes persistent; similar; exceeding apex of florets; similar to fertile lemma in texture; gaping. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; keeled above; 3 -veined. Lower glume primary vein scaberulous. Lower glume surface asperulous. Lower glume apex acute. Upper glume lanceolate; membranous; 1-keeled; keeled above; 3 -veined. Upper glume surface asperulous. Upper glume apex acute.

FLORETS Fertile lemma elliptic; dorsally compressed; 4.5–5.5 mm long; membranous; without keel; 5–7 -veined. Lemma surface pilose. Lemma margins convolute. Lemma hairs 1–2 mm long. Lemma apex lobed; 2 -fid; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; 14–15 mm long overall; with a straight or slightly twisted column; limb scabrous. Column of lemma awn puberulous. Lateral lemma awns arising on apex of lobes; ascending; 3–4 mm long; shorter than principal. Palea lanceolate; 1 length of lemma; 2 -veined; without keels. Palea surface pilose.

FLOWER Lodicules 3; oblong; 1.5 mm long; membranous; acute. Anthers 3; linear; 4–4.5 mm long. Stigmas 3. Styles free to the base.

DISTRIBUTION Asia-temperate: China. Asia-tropical: India.

NOTES Stipeae. Bor.

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