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Descriptions

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

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

Axonopus eminens

HABIT Perennial. Rhizomes absent, or short. Butt sheaths withering, or persistent and investing base of culm; with fibrous dead sheaths. Culms robust; 100–200 cm long; 3–8 -noded. Culm-nodes glabrous, or pubescent, or bearded. Leaves cauline. Leaf-sheaths 15–40 cm long; without keel. Leaf-sheath oral hairs ciliate. Ligule a ciliolate membrane; 0.4–0.5 mm long. Leaf-blade base tapering to the midrib. Leaf-blades conduplicate; 10–100 cm long; 4–15 mm wide. Leaf-blade midrib conspicuous. Leaf-blade surface glabrous. Leaf-blade apex acuminate; hardened.

INFLORESCENCE Inflorescence composed of racemes; with 1 peduncles per sheath. Peduncle 40–70 cm long.

Racemes numerous; 20–50; borne along a central axis; ascending; unilateral; 9–12 cm long. Central inflorescence axis 10–30 cm long. Rhachis angular; 0.3–0.4 mm wide; glabrous on surface; scabrous on margins; glabrous on margins. Spikelet packing adaxial; 5–9 spikelets per cm. Raceme-bases brief.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; subacute; 1.7–2.1 mm long; 0.5–0.8 mm wide; falling entire.

GLUMES Glumes one the lower absent or obscure; reaching apex of florets; thinner than fertile lemma. Upper glume 1 length of spikelet; membranous; 5 -veined. Upper glume lateral veins ribbed. Upper glume surface glabrous, or puberulous; hairy between veins.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; 1–1.1 length of fertile lemma; 1 length of spikelet; 5 -veined; ribbed; glabrous, or puberulous; hairy between veins. Fertile lemma linear; 1.7–2 mm long; indurate; pallid, or yellow; without keel. Lemma margins involute. Lemma apex acute; without ornament. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp.

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

NOTES Paniceae. Black 1994.

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