Deyeuxia archboldii

HABIT Perennial; caespitose. Culms erect; 60–90 cm long. Culm-internodes distally glabrous. Culm-nodes purple. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 3–5 mm long; erose, or lacerate. Leaf-blades 5–20 cm long; 1–3 mm wide. Leaf-blade surface scaberulous; rough adaxially; glabrous. Leaf-blade margins scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong, or pyramidal; 10–20 cm long. Primary panicle branches ascending; whorled at most nodes; 3–6 cm long. Panicle axis with lower internodes 3–5 cm long; smooth. Panicle branches flexuous; scaberulous.

Spikelets appressed; solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 2.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent. Floret callus hairs 0.5 mm long; 0.2 length of lemma.

GLUMES Glumes persistent; similar; shorter than spikelet; firmer than fertile lemma. Lower glume lanceolate; 2 mm long; 1 length of upper glume; coriaceous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume lanceolate; 2 mm long; 0.75–0.85 length of adjacent fertile lemma; coriaceous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex obtuse.

FLORETS Fertile lemma lanceolate; 2.5 mm long; membranous; without keel; 5 -veined. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.75–0.85 way up back of lemma; straight; 0.5–1 mm long overall. Palea 1 length of lemma. Rhachilla extension 0.5 mm long; pilose; with 2 mm long hairs.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Aveneae. Hitchcock 1997.

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