New! - Search other data sources for Trisetum mattheii

Help - Wrong Description?

Kew Data Sources

Kew's Herbarium Catalogue
ePIC - Electronic Plant Information Centre

External Data Sources

Note - this takes you off of our website
Use your browser's back button to return to this page

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.

Trisetum mattheii

HABIT Perennial; caespitose. Culms 20–30 cm long; 2 -noded. Culm-nodes glabrous. Leaf-sheaths longer than adjacent culm internode; glabrous on surface, or pilose. Ligule a ciliolate membrane; 1.5–2 mm long; glabrous on abaxial surface; erose. Leaf-blades conduplicate; 1–6 cm long; 0.5–1 mm wide; stiff. Leaf-blade surface scabrous; rough adaxially; glabrous, or pilose. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle spiciform; linear; continuous, or interrupted; tapering above; nodding; 3–5.5 cm long; 0.5–0.8 cm wide. Panicle axis pubescent.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 4.5–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.6–0.9 mm long. Floret callus pubescent; obtuse.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma; shiny; gaping. Lower glume linear, or lanceolate; 3.5–4.5 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate, or ovate; 3.8–4.7 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 3.5–4 mm long; membranous; mid-green and purple; tipped with last colour; shiny; keeled; 5 -veined. Lemma surface hirsute. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; curved; 2.5–3.5 mm long overall. Lateral lemma awns arising on apex of lobes; 0.3 mm long. Palea gaping; 2.8–3 mm long; hyaline. Palea keels scaberulous; adorned below. Palea apex with excurrent keel veins.

FLOWER Lodicules 2; 0.6–0.8 mm long. Anthers 3; 1.1 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: southern South America.

NOTES Aveneae. Finot et al 2006.

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