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Descriptions

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

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

Mesosetum rottboellioides

HABIT Perennial; caespitose. Culms erect; 27–80 cm long. Culm-internodes distally glabrous. Culm-nodes glabrous. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths glabrous on surface, or pilose. Ligule a fringe of hairs; 1 mm long. Leaf-blades 5–20 cm long; 1–5 mm wide. Leaf-blade surface glabrous, or pilose; hairy on both sides; with simple hairs, or tubercle-based hairs.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; unilateral; 5–13 cm long. Rhachis angular; glabrous on surface, or puberulous on surface. Spikelet packing adaxial; regular; 2 -rowed.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong; 0.5–1 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 4–4.5 mm long; falling entire. Spikelet callus pubescent.

GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 2.8–3.5 mm long; 0.75 length of spikelet; chartaceous; 1-keeled; 3 -veined. Lower glume surface pilose. Lower glume hairs red; 1–1.5 mm long. Lower glume apex obtuse, or acute. Upper glume lanceolate; 3.5–4 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface pilose. Upper glume margins ciliate. Upper glume hairs red. Upper glume apex acute, or acuminate.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret oblong; 1 length of spikelet; membranous; 3 -veined; pilose; hairy below; bearing red hairs; acute. Fertile lemma ovate; dorsally compressed; 2.7–3.2 mm long; coriaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma margins flat. Lemma apex acute. Palea coriaceous; without keels.

FLOWER Anthers 3; purple.

FRUIT Hilum linear; 1 length of caryopsis.

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

NOTES Paniceae. Filgueiras.

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