Poaceae
Agrostis

Agrostis pittieri Hack.

First published in Oesterr. Bot. Z. 52: 60 (1902)
This species is accepted
The native range of this species is Costa Rica, NW. Venezuela. It is a perennial and grows primarily in the montane tropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms 30-60 cm long; 0.5-1 mm diam.; 3 -noded. Culm-nodes purple. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths smooth, or scaberulous; glabrous on surface. Ligule an eciliate membrane; 2.5-3.5 mm long. Leaf-blades filiform; conduplicate; 7-15 cm long; 0.6-1 mm wide. Leaf-blade surface ribbed; scaberulous; rough abaxially.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; linear; 9-11 cm long; 0.5-1 cm wide. Spikelets appressed; solitary. Fertile spikelets pedicelled. Pedicels 1-2 length of fertile spikelet; scabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.9-3.9 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.9-3.9 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume oblong; 2.9-3.9 mm long; 1.1 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; 2.8-3.4 mm long; 1.5-1.7 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; 1.9-2 mm long; hyaline; without keel. Lemma lateral veins obscure; extending close to apex. Lemma apex dentate; 4 -fid; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 2-3 mm long overall; without a column. Palea 0.7-1.1 mm long; 0.33-0.5 length of lemma; hyaline.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 1.2-1.5 mm long; purple.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum linear.
Distribution
South America: Mesoamericana and northern South America.
Reference
Aveneae. Fl Costaric 1993.
[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