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This species is accepted, and its native range is Washington.

[GB]
Morphology General Habit
Perennial; caespitose; clumped moderately, or densely. Rhizomes absent, or short. Culms (20-)30-55(-95) cm long; (1-)2(-5) -noded. Culm-internodes smooth. Lateral branches lacking. Leaf-sheaths smooth. Ligule an eciliate membrane; (3-)3.5-5.5(-6) mm long; entire, or lacerate; truncate, or obtuse. Leaf-blades (6-)7-14(-30) cm long; 1.5-4 mm wide. Leaf-blade surface smooth, or scaberulous; rough abaxially, or on both sides; pubescent; sparsely hairy; hairy adaxially.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Peduncle smooth, or scaberulous above. Panicle open, or contracted; linear, or lanceolate; equilateral, or nodding; (5-)7-10(-18) cm long; (0.5-)1-2(-3) cm wide. Primary panicle branches (2-)2.3-4(-6) cm long; naked below, or bearing spikelets almost to the base. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; (4-)6-6.5(-7) mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1.2-2.5 mm long; 0.3-0.6 length of lemma.
Fertile
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; (4-)6-6.5(-7) mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 1.2-2.5 mm long; 0.3-0.6 length of lemma.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface smooth, or asperulous. Lower glume apex acute. Upper glume lanceolate; (4-)6-6.5(-7) mm long; 1.3-1.5 length of adjacent fertile lemma; membranous; 1-keeled; 1-3 -veined. Upper glume lateral veins absent, or prominent. Upper glume surface smooth, or asperulous; rough above. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; (3.5-)4-5(-5.5) mm long; membranous; without keel; 5 -veined. Lemma apex awned; 1 -awned. Principal lemma awn dorsal; arising 0.1-0.33 way up back of lemma; geniculate; (5.5-)7-8.5(-10) mm long overall; clearly exserted from spikelet; with twisted column. Rhachilla extension 1.5-2(-2.5) mm long; pilose; with 1.5-3 mm long hairs.
Morphology Reproductive morphology Flowers
Anthers 3; (1-)2-3(-3.5) mm long.
Distribution
North America: northwest USA.
Reference
Aveneae. Fl N Amer 2007.

Native to:

Washington

Calamagrostis tacomensis K.L.Marr & Hebda appears in other Kew resources:

First published in Madroño 53: 293 (2006)

Accepted by

  • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

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 Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0