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Descriptions

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

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

Echinolaena minarum

HABIT Perennial. Culms rambling; 25–60 cm long; rooting from lower nodes. Culm-nodes glabrous. Leaf-sheaths outer margin hairy. Ligule a ciliolate membrane; 1–1.5 mm long. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1 cm long. Leaf-blades lanceolate; 4–15 cm long; 3–20 mm wide. Leaf-blade venation with distinct cross veins. Leaf-blade surface pubescent; hairy abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 5–12; borne along a central axis; unilateral; 1–4 cm long. Central inflorescence axis 6–8 cm long. Rhachis angular. Spikelet packing irregular; 4 -rowed.

Spikelets pectinate, or ascending; in pairs. Fertile spikelets sessile and pedicelled; 2 in the cluster. Pedicels 0.5–1 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 shrivelled to concave scars.

GLUMES Glumes dissimilar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 2–3 mm long; 0.66 length of spikelet; herbaceous; without keels; 3 -veined. Lower glume surface hispid; hairy at apex; with tubercle-based hairs. Lower glume apex cuspidate, or caudate; awned; 1 -awned. Lower glume awn 1–2 mm long. Upper glume oblong; 3–4.5 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume apex acuminate; mucronate.

FLORETS Basal sterile florets male; with palea. Lemma of lower sterile floret oblong; 2–3.5 mm long; membranous; 5 -veined; obtuse. Fertile lemma oblong; dorsally compressed; 2–2.3 mm long; indurate; shiny; without keel; 5 -veined. Lemma margins involute. Lemma apex obtuse. Palea indurate.

FLOWER Anthers 3; 1.8–2 mm long.

DISTRIBUTION South America: western South America, Brazil, and southern South America.

NOTES Paniceae. SAR 2003.

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