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.

Ectrosia nervilemma

HABIT Annual; caespitose; clumped loosely. Culms erect, or geniculately ascending; slender; 12–40 cm long; 1–3 -noded. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths loose; striately veined; pilose; with tubercle-based hairs. Ligule a fringe of hairs; 0.2–0.3 mm long. Leaf-blades flat, or conduplicate; 2–10 cm long; 1–4 mm wide. Leaf-blade surface ribbed; pilose; with tubercle-based hairs. Leaf-blade apex acute, or acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; oblong; 6–12 cm long; 1.5–3 cm wide. Primary panicle branches 0.4–0.8 cm long. Panicle branches angular; scaberulous; pilose; with tubercle-based hairs.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear; 0.5–1 mm long; pubescent.

FERTILE SPIKELETS Spikelets comprising 2–8 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 5–11 mm long; 3–6 mm wide; breaking up at maturity; disarticulating above glumes but not between florets.

GLUMES Glumes deciduous; similar; shorter than spikelet. Lower glume lanceolate; 2.5–4 mm long; 0.75–0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 3–4.5 mm long; 0.9–1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acuminate.

FLORETS Fertile florets increasing in size upwards. Fertile lemma lanceolate; dorsally straight along back; 3–5 mm long; cartilaginous; yellow and dark green; mottled with last colour (on veins); keeled; winged on keel; 5–7 -veined. Lemma midvein scaberulous. Lemma lateral veins prominent. Lemma apex acute, or acuminate; muticous, or mucronate, or awned; 1 -awned. Principal lemma awn 0–2 mm long overall. Palea bowed outwards; 2–3 mm long; 0.5 length of lemma; membranous; 2 -veined. Palea keels winged; narrowly winged; scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; red, or purple.

FRUIT Caryopsis with adherent pericarp. Embryo 0.5 length of caryopsis.

DISTRIBUTION Australasia: Australia.

NOTES Eragrostideae. Simon.

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