Arundinella holcoides

HABIT Annual. Butt sheaths pilose. Culms decumbent; 20–45 cm long. Culm-nodes bearded. Leaf-sheaths hirsute; with tubercle-based hairs. Ligule an eciliate membrane. Leaf-blades linear, or lanceolate; 7–15 cm long; 3–10 mm wide; flaccid. Leaf-blade surface pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence a panicle; bearing juvenile spikelets at emergence. Peduncle glabrous, or pilose above.

Panicle open; lanceolate, or oblong; 7–15 cm long; 1–2 cm wide; contracted about primary branches. Primary panicle branches 1–6 -nate; 1–3 cm long. Panicle axis scaberulous; pilose; with tubercle-based hairs. Panicle branches scabrous; pilose; bearded in axils.

Spikelets solitary, or in pairs. Fertile spikelets pedicelled; 1–2 in the cluster. Pedicels glabrous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; laterally compressed; 3–3.5 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; 2–2.5 mm long; 0.66–0.75 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume surface pilose; with tubercle-based hairs. Lower glume apex acuminate; awned; 1 -awned. Upper glume elliptic; 3–3.5 mm long; 2 length of adjacent fertile lemma; 1 length of spikelet; membranous; 1-keeled; 5 -veined. Upper glume surface pilose; with tubercle-based hairs. Upper glume apex caudate.

FLORETS Basal sterile florets male, or barren; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; oblong; 1.5–2 mm long; 1 length of spikelet; membranous; 1-keeled; 3 -veined; acute. Fertile lemma elliptic, or oblong; 1 mm long; coriaceous; without keel. 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; 5 mm long overall; with twisted column. Palea with auriculate flaps; coriaceous; 2 -veined. Palea surface asperulous.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 0.25–0.4 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-tropical: Indo-China and Malesia.

NOTES Arundinelleae. Bor 1993.

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