Arundinella fluviatilis

HABIT Perennial; caespitose; clumped densely. Culms erect; 35–90 cm long. Leaf-sheaths 8–10 cm long; mostly shorter than adjacent culm internode; outer margin hairy. Ligule a ciliolate membrane; 1 mm long. Leaf-blades 10–20 cm long; 3–5 mm wide. Leaf-blade surface pilose. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 10–20 cm long. Primary panicle branches 1–2 -nate; 2–5 cm long.

Spikelets solitary, or in pairs. Fertile spikelets pedicelled. Pedicels 1–4 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets cuneate; dorsally compressed; 4.5–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent; obtuse.

GLUMES Glumes persistent; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 0.66–1 length of upper glume; membranous; 1-keeled; 5 -veined. Lower glume apex acuminate. Upper glume ovate; 4.5–5 mm long; membranous; 1-keeled; 5 -veined. Upper glume surface scabrous; rough on veins. Upper glume apex acute.

FLORETS Basal sterile florets male; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; ovate; 4.5–5 mm long; membranous; 1-keeled; 3 -veined; obtuse. Fertile lemma ovate; 3 mm long; coriaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface asperulous. Lemma margins involute; interlocking with palea keels. Lemma apex awned; 1 -awned. Principal lemma awn straight; 1–1.25 mm long overall. Palea coriaceous; 2 -veined. Palea surface asperulous.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 2 mm long; purple. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; 1.75 mm long. Hilum punctiform.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinelleae. Hand-Maz 1996.

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