Poaceae
Agrostis

Agrostis jahnii Luces

First published in Bol. Soc. Venez. Ci. Nat. 15: 12 (1953)
This species is accepted
The native range of this species is Venezuela. It is a perennial and grows primarily in the montane tropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Culms erect; slender; 20-30 cm long. Culm-internodes smooth, or scaberulous. Leaves mostly basal. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 1.5-2 mm long; obtuse. Leaf-blades flat, or conduplicate; 5-7 cm long; 1.5-2 mm wide. Leaf-blade surface scaberulous. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; ovate; 7-11 cm long. Primary panicle branches ascending; whorled at most nodes. Panicle branches stiff. Spikelets appressed; solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 1.7-2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 1.7-2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume oblong; 1.7-2 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume oblong; 1.7-2 mm long; 1.4 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume lateral veins absent. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; 1.3 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins obscure. Lemma apex dentate; 4 -fid; truncate; muticous. Palea absent or minute.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum linear.
Distribution
South America: northern South America.
Reference
Aveneae. Luces 1996.
[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 2023. 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 2023. 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