Deyeuxia hillebrandii

HABIT Perennial; caespitose. Rhizomes elongated. Culms erect; 30–50 cm long. Lateral branches lacking. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 1 mm long; erose. Leaf-blades flat, or involute; 10–15 cm long; 2–4 mm wide; 2–4 cm long at summit of culm; stiff. Leaf-blade surface scabrous; rough adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 5–10 cm long; 3–7 cm wide. Primary panicle branches ascending; rebranched below middle. Panicle branches smooth; glabrous in axils, or pubescent in axils.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.

GLUMES Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 4–6 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 4–6 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein smooth. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; 4–5 mm long; membranous; much thinner above; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma apex dentate; 4 -fid; awned; 5 -awned. Principal lemma awn dorsal; arising 0.5–0.75 way up back of lemma; curved; 5–10 mm long overall. Palea 1 length of lemma; hyaline; 2 -veined. Palea keels scaberulous. Rhachilla extension 2.5–3 mm long; pilose.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Pacific: north-central.

NOTES Aveneae. Hitchcock 1993.

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