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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Ectrosia agrostoides
HABIT Annual; caespitose; clumped loosely. Culms erect, or geniculately ascending; slender; 10–40 cm long; 1–3 -noded. Culm-internodes smooth; distally glabrous. Lateral branches sparse. Leaf-sheaths loose; striately veined; glabrous on surface, or hirsute; with tubercle-based hairs; outer margin glabrous, or hairy. Leaf-sheath oral hairs bearded. Ligule a fringe of hairs. Leaf-blades erect; filiform; convolute; 1–9 cm long; 0.2–2 mm wide; stiff. Leaf-blade surface scaberulous; rough adaxially; glabrous, or pilose; sparsely hairy. Leaf-blade apex acute.
INFLORESCENCE Inflorescence a panicle.
Panicle open; linear, or lanceolate; loose; 2–12 cm long; 0.5–2.2 cm wide. Primary panicle branches appressed, or ascending; simple; 2–4.5 cm long. Panicle axis scabrous; glabrous. Panicle branches capillary; scaberulous.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear; 0.5–1.5 mm long; glabrous, or pubescent.
FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets linear, or lanceolate; laterally compressed; 2–3 mm long; breaking up at maturity; disarticulating above glumes but not between florets.
GLUMES Glumes deciduous; similar; shorter than spikelet. Lower glume lanceolate; 1–2 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1–2 mm long; 0.66–1.1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acute.
FLORETS Fertile lemma oblong; dorsally straight along back; 1.5–1.8 mm long; membranous; keeled; 3 -veined. Lemma midvein scaberulous. Lemma apex emarginate; mucronate, or awned; 1 -awned. Principal lemma awn 0.2–1 mm long overall. Palea 1 mm long; 2 -veined. Palea keels ciliolate. Apical sterile florets 3–4 in number; barren; lanceolate, or rudimentary; 1–1.5 mm long. Apical sterile lemmas awned; 1 -awned. Apical sterile lemma awns 3–6 mm long.
FLOWER Anthers 3; 0.2–0.3 mm long.
FRUIT Caryopsis with adherent pericarp; 0.6 mm long.
DISTRIBUTION Asia-tropical: Malesia and Papuasia. Australasia: Australia. Pacific: northwestern.
NOTES Eragrostideae. CEH.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
