Arundinella hookeri

HABIT Perennial. Butt sheaths glabrous. Culms erect; 20–45 cm long. Culm-internodes distally glabrous. Culm-nodes glabrous. Leaf-sheaths hirsute; with tubercle-based hairs. Ligule an eciliate membrane. Leaf-blades lanceolate; 3–12 cm long; 3–6 mm wide. Leaf-blade surface scaberulous; rough on both sides; pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade margins scaberulous. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle; bearing juvenile spikelets at emergence. Peduncle glabrous.

Panicle contracted; linear; 10–15 cm long; contracted about primary branches. Primary panicle branches 1.5–2 cm long; bearing spikelets almost to the base. Panicle axis glabrous, or pilose. Panicle branches scabrous; pilose.

Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded; obtuse.

GLUMES Glumes persistent; dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume elliptic; 4–4.5 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3–5 -veined. Lower glume surface pilose; hairy on veins; with tubercle-based hairs. Lower glume apex acuminate. Upper glume elliptic; 5–6 mm long; 2–2.5 length of adjacent fertile lemma; 1 length of spikelet; membranous; 1-keeled; 5 -veined. Upper glume surface pilose; hairy on veins; with tubercle-based hairs. Upper glume apex acuminate.

FLORETS Basal sterile florets male; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; oblong; 4 mm long; 1 length of spikelet; membranous; 1-keeled; 5 -veined; scabrous; rough on midvein; acute. Fertile lemma elliptic, or oblong; 2.25–2.5 mm long; coriaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface asperulous. Lemma margins involute; interlocking with palea keels. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 3–4 mm long overall; with twisted column. Column of lemma awn 1.5 mm long. Palea with auriculate flaps; coriaceous; 2 -veined. Palea surface asperulous.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 1.25–1.5 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: China. Asia-tropical: India and Indo-China.

NOTES Arundinelleae. Bor 1993.

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