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Descriptions

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

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

Digitaria paraguayensis

HABIT Perennial; caespitose. Culms decumbent; slender; 35–40 cm long. Culm-internodes distally glabrous. Lateral branches ample. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs lacking, or ciliate. Ligule an eciliate membrane; 0.5–0.6 mm long; brown; truncate. Leaf-blades filiform; 6–15 cm long; 1–1.5 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence composed of racemes; exserted, or embraced at base by subtending leaf.

Racemes 1; single; unilateral; 3–7 cm long. Rhachis angular; 0.3–0.5 mm wide; pubescent on surface.

Spikelets in threes. Fertile spikelets pedicelled; 3 in the cluster. Pedicels angular; unequal; 0.6–2.5 mm long; scaberulous; ciliate; hairy at tip; tip cupuliform.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 1.9–2 mm long; falling entire.

GLUMES Glumes shorter than spikelet; thinner than fertile lemma. Lower glume oblate; 0.3 mm long; 0.15 length of spikelet; hyaline; 0 -veined. Lower glume lateral veins absent. Lower glume apex obtuse. Upper glume elliptic; 1.7–1.8 mm long; 0.9 length of spikelet; membranous; without keels; 3 -veined. Upper glume surface pubescent; with clavate hairs. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret elliptic; 1.9–2 mm long; 1 length of spikelet; membranous; 7 -veined; pubescent; with clavate hairs; acute. Palea of lower sterile floret 0.2 mm long. Fertile lemma elliptic; 1.7–1.8 mm long; cartilaginous; much thinner on margins; dark brown; without keel. Lemma surface striate. Lemma margins flat; covering most of palea. Lemma apex apiculate. Palea 1 length of lemma; cartilaginous.

FLOWER Lodicules 2; 0.2–0.3 mm long. Anthers 3; 0.8–0.9 mm long.

FRUIT Caryopsis with adherent pericarp; 1.5 mm long. Embryo 0.5 length of caryopsis. Hilum punctiform.

DISTRIBUTION South America: southern South America.

NOTES Paniceae. Fl Paraguay 1997.

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