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Descriptions

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

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

Setaria retiglumis

HABIT Annual. Culms erect; 10–50 cm long; 2–3 -noded. Culm-nodes glabrous. Leaf-sheaths glabrous on surface. Ligule a fringe of hairs; 0.7–1 mm long. Leaf-blades flat, or involute; 4–10 cm long; 3–5 mm wide. Leaf-blade surface scabrous; glabrous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes borne along a central axis; appressed; unilateral; 1.5–3 cm long; bearing 7–17 fertile spikelets on each. Central inflorescence axis 6.5–18 cm long; tip filiform. Rhachis narrowly winged; angular; scabrous on margins; terminating in a barren extension; extension bristle-like; extension 1.7–2.4 mm long. Spikelet packing abaxial; 2 -rowed.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.3–0.5 mm long; scabrous; tip discoid.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or ovate; dorsally compressed; plano-convex; 2.7–3.1 mm long; 1.4–1.6 mm wide; falling entire.

GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume oblong, or ovate; 0.8–1.1 mm long; 0.33 length of spikelet; membranous; without keels; 5 -veined. Lower glume lateral veins prominent; transversely connected at apex. Lower glume apex truncate. Upper glume ovate; 2.5–2.9 mm long; 0.9 length of adjacent fertile lemma; 1 length of spikelet; membranous; without keels; 11–15 -veined. Upper glume lateral veins with cross-veins. Upper glume apex acute, or acuminate.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; elliptic, or ovate; 2.7–3.1 mm long; 1 length of spikelet; membranous; 11 -veined; with cross-veins; acute, or acuminate. Fertile lemma ovate; 2.6–3.1 mm long; indurate; without keel. Lemma surface rugose. Lemma margins involute. Lemma apex acute, or acuminate. Palea reflexed at apex; indurate; 2-keeled. Palea surface rugose.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Australasia: Australia.

NOTES Paniceae. Webster 1993.

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