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Descriptions

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

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

Plinthanthesis paradoxa

HABIT Perennial; caespitose; clumped densely. Culms erect; 25–50 cm long; 3–4 -noded. Culm-nodes glabrous. Leaves mostly basal. Ligule a fringe of hairs; 0.5 mm long. Leaf-blades filiform; convolute; 20–40 cm long; 2–3 mm wide. Leaf-blade surface ribbed; scabrous; rough adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate, or pyramidal; 7–20 cm long. Primary panicle branches spreading. Panicle axis scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; scaberulous.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 4–9 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5–2 mm long. Floret callus brief.

GLUMES Glumes persistent; similar; shorter than spikelet, or reaching apex of florets; gaping. Lower glume lanceolate; 4–6 mm long; 1 length of upper glume; chartaceous; 1-keeled; 3 -veined. Lower glume surface asperulous. Lower glume apex obtuse, or acute. Upper glume lanceolate; 4–6 mm long; 1.3–1.5 length of adjacent fertile lemma; chartaceous; 1-keeled; 3 -veined. Upper glume surface asperulous. Upper glume apex obtuse, or acute.

FLORETS Fertile lemma oblong; 3–4 mm long; chartaceous; much thinner above; without keel; 9 -veined. Lemma surface pubescent; hairy below; hairy between veins. Lemma apex lobed; 2 -fid; with triangular lobes; with lobes 1–1.5 mm long; incised 0.25 of lemma length; obtuse, or acute; awned; 1 -awned. Principal lemma awn from a sinus; curved; reflexed; 1–1.5 mm long overall; not or scarcely exserted from spikelet. Palea linear, or lanceolate; 0.9–1.1 length of lemma; chartaceous; thinner above; 2 -veined. Palea keels scaberulous; adorned above. Palea surface pubescent; hairy on back and on flanks; hairy below.

FLOWER Lodicules 2; fleshy; glabrous. Anthers 3; 2–3 mm long.

FRUIT Caryopsis with adherent pericarp; ellipsoid. Hilum linear; 0.5 length of caryopsis.

DISTRIBUTION Australasia: Australia.

NOTES Arundineae. Vickery.

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