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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 longiaristatum

HABIT Annual. Culms decumbent; slender; 40–70 cm long; rooting from lower nodes. Culm-nodes bearded. Lateral branches ample. Leaves cauline. Leaf-sheaths glabrous on surface; outer margin hairy. Ligule a fringe of hairs; 1 mm long. Leaf-blades 5–11 cm long; 2–5 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; unilateral; 5–7 cm long. Rhachis broadly winged; foliaceous; 2–2.2 mm wide; ciliate on margins. Spikelet packing adaxial; crowded.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong.

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; 3–3.5 mm long; 0.75 length of spikelet; chartaceous; 1-keeled; 3 -veined. Lower glume surface scabrous. Lower glume apex dentate; 2 -fid; awned; 1 -awned. Lower glume awn 17–25 mm long. Upper glume lanceolate; 4–4.5 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume surface with a dorsal tuft of hair. Upper glume margins ciliate. Upper glume apex dentate; 2 -fid; awned; 1 -awned. Upper glume awn 1–2 mm long.

FLORETS Basal sterile florets barren; with palea, or without significant palea. Lemma of lower sterile floret oblong; 1 length of spikelet; membranous; 5 -veined; with marginal tufts of hair; 2 hair tufts in all; ciliate on margins; dentate; 2 -fid; muticous, or mucronate. Fertile lemma ovate; dorsally compressed; 3–3.2 mm long; coriaceous; without keel; 5 -veined. Lemma margins flat. Lemma apex acute. Palea coriaceous; without keels.

FLOWER Anthers 3; purple.

FRUIT Caryopsis ellipsoid; 2 mm long. Embryo 0.55 length of caryopsis. Hilum linear; 1 length of caryopsis.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Filgueiras.

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