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Descriptions

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

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

Echinochloa inundata

HABIT Annual. Culms erect, or geniculately ascending; 60–120 cm long; 4–8 mm diam.; compressible; 5 -noded. Culm-nodes glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule absent. Leaf-blades 15–30 cm long; 6–12 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes numerous; borne along a central axis; erect, or ascending; unilateral; 2–6 cm long. Central inflorescence axis 7–10 cm long; with scattered hairs. Rhachis subterete; scabrous on margins. Spikelet packing crowded; 4 -rowed.

Spikelets in pairs. Fertile spikelets pedicelled; subequal. Pedicels unequal.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; cuspidate; 3.5–5 mm long; 1.75–2 mm wide; falling entire.

GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; clasping; 0.5–0.6 length of spikelet; without keels; 3–5 -veined. Lower glume surface scabrous. Lower glume apex cuspidate. Upper glume ovate; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface scabrous; hispidulous; with tubercle-based hairs. Upper glume apex cuspidate; muticous, or mucronate.

FLORETS Basal sterile florets male, or barren; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 5–7 -veined; concave across back; hispidulous; with tubercle-based hairs; cuspidate; muticous, or awned. Awn of lower sterile floret 0–12 mm long. Palea of lower sterile floret 0.75–0.85 length of lemma. Fertile lemma elliptic; 3.5–3.75 mm long; indurate; much thinner above; yellow; shiny; without keel; 5 -veined. Lemma margins involute. Lemma apex acute; laterally pinched. Palea reflexed at apex; indurate.

FLOWER Anthers 3; 1–1.3 mm long.

FRUIT Caryopsis with adherent pericarp; ovoid; 1.8–2.2 mm long; light brown. Embryo 0.75 length of caryopsis.

DISTRIBUTION Australasia: Australia.

NOTES Paniceae. Vickery 1994.

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