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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 senescens

HABIT Perennial. Culms 50–100 cm long; 1–2 -noded. Culm-internodes elliptical in section; distally glabrous. Leaves without demarcation between sheath and blade. Leaf-sheaths 5–20 cm long; keeled; outer margin hairy. Ligule a ciliolate membrane. Leaf-blades 15–30 cm long; 3–5 mm wide. Leaf-blade surface pubescent; hairy adaxially. Leaf-blade apex abruptly acute; hooded.

INFLORESCENCE Inflorescence composed of racemes; with 1–2 peduncles per sheath. Peduncle glabrous.

Racemes digitate; ascending; unilateral; 5–13 cm long. Central inflorescence axis 0.5–2 cm long. Rhachis angular; 0.5–0.7 mm wide; villous on surface; scabrous on margins; setose on margins. Rhachis hairs white; 2–3 mm long. Spikelet packing adaxial; 7–10 spikelets per cm. Raceme-bases brief; pubescent.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels reduced to a stump; 0.1–0.2 mm long; bearing a few hairs; hairy at tip.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; dorsally compressed; obtuse to acute; 1.6–1.7 mm long; 0.6 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; 2 -veined. Upper glume primary vein absent. Upper glume lateral veins prominent. Upper glume surface pilose; hairy on veins; without hair tufts, or with an apical beard.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret similar to upper glume; 1 length of fertile lemma; 1 length of spikelet; 2 -veined; without midvein; prominently veined; pilose; hairy on veins; without hair tufts, or with conspicuous apical hairs. Fertile lemma 1.6–1.7 mm long; indurate; yellow; dull; without keel. Lemma surface with conspicuous apical hairs. Lemma margins involute. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: northern South America and Brazil.

NOTES Paniceae. Black 1994.

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