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Descriptions

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

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

Echinopogon nutans

HABIT Perennial; culms solitary, or caespitose. Rhizomes elongated. Culms erect, or geniculately ascending; 30–70 cm long; 4–8 -noded. Culm-internodes retrorsely scabrous. Lateral branches lacking. Leaf-sheaths retrorsely scabrous; glabrous on surface, or pilose. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blades 2–15 cm long; 3–6 mm wide. Leaf-blade surface smooth, or scaberulous; glabrous. Leaf-blade apex acuminate; muticous, or pungent.

INFLORESCENCE Inflorescence a panicle. Peduncle nodding; smooth, or scaberulous above.

Panicle spiciform, or capitate; oblong, or ovate; 2.5–5 cm long; 0.8–2 cm wide.

Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels oblong.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets linear, or lanceolate; laterally compressed; 5–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; bearded. Floret callus hairs 1 mm long.

GLUMES Glumes persistent; similar; reaching apex of florets; thinner than fertile lemma. Lower glume lanceolate; 5–7 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous; eciliate, or ciliolate. Lower glume lateral veins absent. Lower glume apex attenuate. Upper glume lanceolate; 5–7 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous; eciliate, or ciliolate. Upper glume lateral veins absent. Upper glume apex attenuate.

FLORETS Fertile lemma lanceolate; 5–7 mm long; cartilaginous; keeled; 5 -veined. Lemma apex dentate; 2 -fid; acute; awned; 3 -awned. Principal lemma awn from a sinus; 6–14 mm long overall. Lateral lemma awns arising on apex of lobes; 1–2 mm long; shorter than principal. Palea 1 length of lemma; 2 -veined. Palea keels ciliolate; adorned above.

FLOWER Anthers 3; 1 mm long. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; 3 mm long; hairy at apex. Hilum linear.

DISTRIBUTION Asia-tropical: Papuasia. Australasia: Australia.

NOTES Aveneae. CEH.

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