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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Echinolaena oplismenoides
HABIT Annual. Culms geniculately ascending, or decumbent; 60–100 cm long; rooting from lower nodes. Culm-internodes distally glabrous, or pilose. Ligule a fringe of hairs; 1–2.5 mm long. Leaf-blade base broadly rounded. Leaf-blades lanceolate; 5–10 cm long; 15–20 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade surface pubescent; hairy abaxially. Leaf-blade margins tuberculate-ciliate; hairy at base.
INFLORESCENCE Inflorescence composed of racemes.
Racemes 5–12; borne along a central axis; unilateral; 1–4 cm long. Central inflorescence axis 8–15 cm long; pilose. Rhachis subterete; pilose on surface.
Spikelets pectinate; in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels oblong; 1 mm long.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; acuminate; 4–5 mm long; falling entire; readily shedding fertile florets. Floret callus winged; with apical wings adnate to lemma; these appendages 1 mm long.
GLUMES Glumes similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 2–2.5 mm long; 0.5 length of spikelet; herbaceous; without keels; 5 -veined. Lower glume primary vein ciliate. Lower glume surface pilose; with tubercle-based hairs. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 4–6 mm long. Upper glume lanceolate; 3.5–4.5 mm long; 0.9 length of spikelet; membranous; without keels; 5 -veined. Upper glume primary vein ciliate. Upper glume surface pilose; hairy on veins; with tubercle-based hairs. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 2–3 mm long.
FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret elliptic; 3.5–4.5 mm long; membranous; 5 -veined; ciliolate on margins; acute. Fertile lemma elliptic; dorsally compressed; 2–4 mm long; indurate; without keel. Lemma surface granulose. Lemma margins involute; covering most of palea. Lemma apex obtuse. Palea involute; indurate.
FLOWER Anthers 3.
DISTRIBUTION South America: Brazil.
NOTES Paniceae. SAR 2003.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
