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Descriptions

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

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

Arundinella grevillensis

HABIT Perennial; caespitose. Rhizomes elongated. Butt sheaths woolly. Culms 12–25 cm long. Leaves mostly basal. Leaf-sheaths longer than adjacent culm internode; striately veined; pilose; with tubercle-based hairs. Ligule a ciliolate membrane; 1 mm long. Leaf-blades filiform; involute; 4–7 cm long; 1 mm wide. Leaf-blade surface pilose; sparsely hairy; with tubercle-based hairs.

INFLORESCENCE Inflorescence a panicle; comprising 3–17 fertile spikelets; bearing juvenile spikelets at emergence.

Panicle open; oblong; 4–8 cm long; bearing few spikelets.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2–4 mm long.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 5 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; exceeding apex of florets; thinner than fertile lemma; gaping. Lower glume ovate; 4 mm long; 0.75 length of upper glume; membranous; 1-keeled; 7 -veined. Lower glume primary vein scaberulous. Lower glume apex acuminate. Upper glume ovate; 5 mm long; 1 length of adjacent fertile lemma; 1 length of spikelet; membranous; 1-keeled; 5 -veined. Upper glume apex acuminate.

FLORETS Basal sterile florets male; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; ovate; 5 mm long; membranous; 1-keeled; 5 -veined; acute. Palea of lower sterile floret 3.5 mm long. Fertile lemma ovate; 2.5 mm long; coriaceous; without keel. Lemma surface scabrous. Lemma margins involute; interlocking with palea keels. Lemma apex truncate; awned; 1 -awned. Principal lemma awn geniculate; 4.5 mm long overall; with twisted column. Palea with auriculate flaps; 3 mm long; coriaceous; 2 -veined. Palea surface asperulous.

FLOWER Lodicules 2. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; 1 mm long. Hilum punctiform.

DISTRIBUTION Australasia: Australia.

NOTES Arundinelleae. Simon 1995.

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