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.

Deyeuxia lacustris

HABIT Perennial; caespitose. Basal innovations extravaginal. Culms erect; 18–30 cm long. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2–3 mm long; erose. Leaf-blades conduplicate; 2–9 cm long; 1.5–2 mm wide. Leaf-blade surface ribbed; scabrous; rough adaxially. Leaf-blade margins scaberulous. Leaf-blade apex hooded.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; 1.5–4.5 cm long; 0.5–0.8 cm wide. Panicle axis scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 5–7 mm long; breaking up at maturity. Floret callus pilose. Floret callus hairs 0.3–1 mm long.

GLUMES Glumes similar. Lower glume lanceolate; 5–7 mm long; membranous; 1 -veined. Lower glume apex acute. Upper glume lanceolate; 5–7 mm long; membranous; 1 -veined. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 4–5 mm long; cartilaginous. Lemma surface scaberulous; rough above. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.75 way up back of lemma; geniculate; 3.5–4.5 mm long overall; with twisted column. Palea 0.66 length of lemma. Palea keels scaberulous; adorned above. Rhachilla extension 0.5–1 mm long; glabrous.

FLOWER Lodicules 2; 0.4–0.5 mm long. Anthers 3; 0.3–0.6 mm long; retained within floret.

FRUIT Caryopsis 2 mm long.

DISTRIBUTION Australasia: New Zealand.

NOTES Aveneae. Edgar & Connor 2001.

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