GrassBase - The Online World Grass Flora


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

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

Axonopus uninodis

HABIT Perennial; caespitose. Rhizomes short. Butt sheaths persistent and investing base of culm; with compacted dead sheaths. Culms erect; 50–80 cm long; 1–3 -noded. Culm-internodes elliptical in section; 20–35 cm long; yellow, or purple; smooth; distally glabrous. Culm-nodes pubescent, or bearded. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths 6–14 cm long; glabrous on surface; outer margin glabrous, or hairy. Leaf-sheath oral hairs ciliate. Ligule a ciliolate membrane; 0.3 mm long. Collar glabrous. Leaf-blades filiform; involute; 17–60 cm long; 0.5–1 mm wide; stiff. Leaf-blade surface glabrous; hairless except near base. Leaf-blade apex acuminate; pungent; hardened; hairy.

INFLORESCENCE Inflorescence composed of racemes. Peduncle 20–50 cm long; glabrous.

Racemes 2–4(–7); digitate, or borne along a central axis; erect, or ascending; flexuous; unilateral; 4–8.5 cm long. Central inflorescence axis 2–6 cm long. Rhachis angular; 0.3–0.6 mm wide; drab; glabrous on surface; glabrous on margins. Spikelet packing adaxial; 2 -rowed. Raceme-bases glabrous.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels oblong; 0.2–0.6 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; acuminate; 4.2–4.5 mm long; 0.9 mm wide; falling entire.

GLUMES Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume 4–4.6 mm long; 1 length of spikelet; membranous; 5 -veined. Upper glume lateral veins obscure. Upper glume margins villous. Upper glume hairs 1–2.4 mm long.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; 4.2–4.8 mm long; 1.3–1.4 length of fertile lemma; 1 length of spikelet; 5 -veined; obscurely veined; villous on margins; bearing hairs 1–2.4 mm long. Fertile lemma elliptic; 3–3.8 mm long; 0.8 mm wide; indurate; yellow; without keel. Lemma surface papillose. Lemma margins involute. Lemma apex obtuse; pubescent. Palea involute; indurate.

FLOWER Lodicules 2; cuneate; 0.2 mm long. Anthers 3; 2.7 mm long; purple.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Brazil and southern South America.

NOTES Paniceae. Fl Paraguay 1997.

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