Poaceae
Pentapogon

Pentapogon lacustris (Edgar & Connor) de Lange & L.M.H.Schmid

First published in Ukrayins'k. Bot. Zhurn. 79: 75 (2022)
This species is accepted
The native range of this species is New Zealand South Island. It is a perennial and grows primarily in the subalpine or subarctic biome.

Descriptions

Morphology General 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.
Morphology Reproductive morphology Inflorescences
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.
Morphology Reproductive morphology Inflorescences 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.
Fertile
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.
Morphology Reproductive morphology Inflorescences Bracts Glume
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.
Morphology Reproductive morphology Flowers 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.
Morphology Reproductive morphology Flowers
Lodicules 2; 0.4-0.5 mm long. Anthers 3; 0.3-0.6 mm long; retained within floret.
Morphology Reproductive morphology Fruits
Caryopsis 2 mm long.
Distribution
Australasia: New Zealand.
Reference
Aveneae. Edgar & Connor 2001.
[GB]

Sources

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). 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 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 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 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0