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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 pappophorum

HABIT Annual. Culms erect, or geniculately ascending; 15–50 cm long; rooting from lower nodes. Culm-nodes bearded. Leaves cauline. Leaf-sheaths outer margin hairy. Ligule a fringe of hairs; 1.5 mm long. Leaf-blades 2–6.5 cm long; 2–5 mm wide. Leaf-blade surface glabrous, or pilose; hairy on both sides; with tubercle-based hairs. Leaf-blade margins cartilaginous; ciliate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; unilateral; 2.3–5 cm long. Rhachis angular; 0.5–1 mm wide; ciliate on margins. Spikelet packing adaxial.

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; gibbous; 2.8–3.5 mm long; falling entire. Spikelet callus pubescent.

GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 2.2–2.6 mm long; 0.75 length of spikelet; chartaceous; 1-keeled; 3–5 -veined. Lower glume surface with a dorsal tuft of hair. Lower glume apex acute. Upper glume lanceolate; gibbous; 2.7–3 mm long; 1 length of spikelet; membranous; without keels; 5 -veined. Upper glume lateral veins transversely connected at apex. Upper glume surface pilose. Upper glume margins ciliate. Upper glume hairs 1–2 mm long. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret oblong; 1 length of spikelet; membranous; 5 -veined; with veins transversely connected at apex; with marginal tufts of hair; 2 hair tufts in all; acute. Fertile lemma ovate; dorsally compressed; 2–2.8 mm long; coriaceous; shiny; without keel; 5 -veined. Lemma surface smooth. Lemma margins flat. Lemma apex acute. Palea coriaceous; without keels.

FLOWER Anthers 3; yellow, or purple.

FRUIT Caryopsis 1.5–2 mm long; dark brown. Embryo 0.66 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.