Deyeuxia youngii

HABIT Perennial. Culms erect; 30–120 cm long; 3 -noded; with 0.5 of their length below uppermost node. Leaf-sheaths scaberulous. Ligule an eciliate membrane; obtuse. Leaf-blades 3–6 mm wide; flaccid. Leaf-blade surface smooth, or scabrous; rough adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; 6–15 cm long. Primary panicle branches 2–3 -nate.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.33 length of lemma.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 6 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 5 mm long; membranous; without keel. Lemma apex erose; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 1.5–2 mm long overall. Rhachilla extension 0.33 length of fertile floret; pilose.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.

DISTRIBUTION Australasia: New Zealand.

NOTES Aveneae. Cheeseman 1995.

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