GrassBase - The Online World Grass Flora


W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Setaria reflexa

HABIT Annual. Culms erect; 20–55 cm long; 2–5 -noded. Culm-nodes glabrous. Leaf-sheaths keeled; smooth; glabrous on surface; outer margin hairy. Ligule an eciliate membrane; 0.6–0.9 mm long; truncate. Collar glabrous. Leaf-blades 8–26 cm long; 2–4.5 mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade margins smooth; glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 3–10; borne along a central axis; deflexed; unilateral; 2–6 cm long; bearing 8–20 fertile spikelets on each. Central inflorescence axis 10–18 cm long; tip filiform. Rhachis angular; 0.5–0.65 mm wide; smooth on surface, or scabrous on surface; scabrous on margins; terminating in a barren extension; extension bristle-like; extension 2–4 mm long. Spikelet packing abaxial; lax; irregular.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.3–0.6 mm long; smooth, or scaberulous.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; plano-convex; 2.6–3.3 mm long; 1–1.1 mm wide; falling entire.

GLUMES Glumes reaching apex of florets; thinner than fertile lemma. Lower glume ovate; clasping; 1.8–3.2 mm long; 0.66 length of spikelet; membranous; without keels; 3 -veined. Lower glume margins ciliolate. Lower glume apex obtuse, or acute. Upper glume elliptic; 2.6–3.3 mm long; 1 length of spikelet; membranous; without keels; 9–11 -veined. Upper glume apex acute.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; elliptic; 2.6–3.3 mm long; 1 length of spikelet; membranous; 7 -veined; distinctly veined; with veins transversely connected at apex; acute. Fertile lemma elliptic; 2.5–3.2 mm long; indurate; without keel. Lemma lateral veins obscure. Lemma surface rugulose. Lemma margins involute. Lemma apex obtuse, or acute; mucronate. Palea reflexed at apex; indurate; 2-keeled. Palea surface rugose.

FLOWER Anthers 3.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Australasia: Australia.

NOTES Paniceae. Simon 1997.

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