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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.
Pseudochaetochloa arnhemica
HABIT Perennial; caespitose. Rhizomes short. Culms erect; 50–120 cm long; 3–12 -noded. Culm-nodes pubescent. Ligule a fringe of hairs; 0.8–2.3 mm long. Leaf-blades flat, or conduplicate; 20–50 cm long; 2–5.5 mm wide. Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins scabrous. Leaf-blade apex attenuate; filiform.
INFLORESCENCE Dioecious. Inflorescence a panicle.
Panicle spiciform; linear; 8–15 cm long. Primary panicle branches accrescent to a central axis; with sessile scars on axis. Panicle axis angular; scaberulous; bearing deciduous spikelet clusters.
Spikelets subtended by an involucre. Fertile spikelets sessile; 1 in the cluster. Male spikelets pedicelled. Involucre composed of bristles; ovate; 10–20 mm long; base truncate; base pubescent. Involucral bristles deciduous with the fertile spikelets; 7–12 in principal whorl; with longest bristle scarcely emergent; terete; flexible; antrorsely scaberulous (above); plumose (below).
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 4–6 mm long; 1.2–1.4 mm wide; falling entire; deciduous with accessory branch structures.
GLUMES Glumes similar; shorter than spikelet; thinner than fertile lemma. Lower glume ovate; 1.4–3.8 mm long; 0.33–0.66 length of spikelet; membranous; without keels; 0–3 -veined. Lower glume apex entire, or erose; obtuse, or acute; muticous, or mucronate. Upper glume lanceolate, or ovate; 2.3–2.6 mm long; 0.5–0.66 length of spikelet; membranous; without keels; 3(–5) -veined. Upper glume apex obtuse, or acute.
FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 1 length of spikelet; membranous; 5 -veined; ciliate on margins; acute, or acuminate; muticous, or mucronate. Fertile florets female. Fertile lemma lanceolate; 3.4–3.8 mm long; coriaceous; without keel. Lemma surface striate. Lemma margins flat. Lemma apex acute, or acuminate; pubescent. Palea coriaceous.
MALE Male inflorescence unlike female (spiciform with branches, involucre sparsely hairy); a panicle. Male spikelets distinct from female; 2 flowered; lanceolate; glabrous. Male spikelet glumes 2. Male spikelet lemma 3 -veined.
DISTRIBUTION Australasia: Australia.
NOTES Paniceae. Webster.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
