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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 monticola

HABIT Perennial. Rhizomes elongated. Culms erect; robust; 100–150 cm long; 2–3 -noded. Culm-internodes elliptical in section. Culm-nodes glabrous, or pubescent. Leaves without demarcation between sheath and blade. Leaf-sheaths 10–40 cm long; outer margin glabrous, or hairy. Ligule a ciliolate membrane; 0.3–0.4 mm long. Leaf-blades conduplicate; 15–40 cm long; 6–8 mm wide; stiff. Leaf-blade surface smooth. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes; with 1–2 peduncles per sheath. Peduncle 20–50 cm long.

Racemes 15–20; borne along a central axis; ascending; unilateral; 5–25 cm long; simple, or with branchlets at base of longer racemes. Central inflorescence axis 10–15 cm long. Rhachis angular; 0.3–0.4 mm wide; drab, or dark-coloured (purple); glabrous on surface; scabrous on margins; glabrous on margins, or ciliate on margins. Rhachis hairs 0.3–0.8 mm long. Spikelet packing adaxial; 3.5–6 spikelets per cm.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels reduced to a stump; 0.3–0.5 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or ovate; dorsally compressed; obtuse, or subacute; 1.7–2.3 mm long; 0.6–0.8 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; purple; 4–5 -veined. Upper glume primary vein absent, or obscure. Upper glume surface puberulous; hairy between veins.

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; purple; 4–5 -veined; with obscure midvein; puberulous; hairy between veins. Fertile lemma 1.7–2.3 mm long; indurate; yellow; without keel. Lemma margins involute. Lemma apex acute; without ornament. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: Brazil.

NOTES Paniceae. Black 1994.

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