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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Piptatherum hilariae

HABIT Perennial; caespitose; clumped densely. Culms 10–50(–70) cm long. Culm-nodes glabrous. Ligule an eciliate membrane; 2.5–3 mm long. Leaf-blades flat, or involute; 5–30 cm long; 1.5–4.5 mm wide. Leaf-blade surface smooth, or scaberulous; rough abaxially; glabrous, or pubescent; hairy adaxially. Leaf-blade margins scaberulous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; (3–)7–30 cm long. Primary panicle branches appressed; 1.5–5 cm long. Panicle branches smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 4–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus obtuse.

GLUMES Glumes persistent; similar; with lower wider than upper; exceeding apex of florets; thinner than fertile lemma. Lower glume elliptic; 4–8 mm long; 1 length of upper glume; membranous; without keels; 5 -veined. Lower glume apex acute. Upper glume elliptic; 4–8 mm long; 1.5–2 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma elliptic, or ovate; dorsally compressed; 2.6–4.2 mm long; coriaceous; light brown; without keel. Lemma surface puberulous; hairy below; with conspicuous apical hairs. Lemma margins involute; exposing palea. Lemma hairs 0.2–0.3 mm long. Lemma apex dentate; 2 -fid; rostrate; awned; 1 -awned. Principal lemma awn subapical; spreading; 1.8–4 mm long overall; not or scarcely exserted from spikelet; deciduous. Palea coriaceous; 2 -veined; without keels.

FLOWER Anthers 3; 1.2–2.75 mm long; anther tip smooth.

FRUIT Caryopsis with adherent pericarp; oblong; isodiametric; 2 mm long. Hilum linear.

DISTRIBUTION Asia-temperate: Soviet Middle Asia, western Asia, and China. Asia-tropical: India.

NOTES Stipeae. Fl Pak 1992.

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