Puccinellia decumbens A.R.Williams

First published in Fl. Australia 44A: 386 (2009)
This species is accepted
The native range of this species is South Australia. It is an annual or perennial and grows primarily in the desert or dry shrubland biome.

Descriptions

Morphology General Habit
Annual; caespitose; clumped densely. Stolons absent, or present. Basal innovations extravaginal. Culms erect, or geniculately ascending; 7-13 cm long. Lateral branches ample. Leaf-sheaths tight. Ligule an eciliate membrane; 1.2-2 mm long. Leaf-blades involute; 1-2 cm long; 0.2-0.7 mm wide.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; embraced at base by subtending leaf. Panicle open; lanceolate; 3-6 cm long. Primary panicle branches 1.3-1.5 cm long; bearing spikelets almost to the base. Panicle branches smooth, or scaberulous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 3-5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 3-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus sparsely hairy.
Fertile
Spikelets comprising 3-5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 3-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus sparsely hairy.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; dissimilar; shorter than spikelet. Lower glume ovate; 1-1.3 mm long; 0.66 length of upper glume; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 1.7-1.9 mm long; 0.75 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 2-2.6 mm long; membranous; much thinner above; without keel; 5 -veined. Lemma midvein extending to apex. Lemma lateral veins stopping well short of apex. Lemma surface puberulous; hairy at base. Lemma apex obtuse; muticous, or mucronate. Palea 1.9-2.2 mm long; 2 -veined. Palea keels scabrous; adorned below; with 0.5 of their length adorned. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Anthers 3; 0.5-0.6 mm long; pallid.
Distribution
Australasia: Australia.
Reference
Poeae. Fl Australia 2010.
[GB]

Sources

  • GrassBase - The Online World Grass Flora

    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2022. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2022. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0