Treatment appears in FNA Volume 24. Treatment on page 602.
 TaxonIllustrator 
FNA24 P228B Dupontia pg 603.jpegDupontia fisheriLinda Ann Vorobik
Hana Pazdírková

Plants perennial; rhizomatous. Culms 5-80 cm. Sheaths closed for 1/2 - 2/3 their length, glabrous; auricles absent; ligules membranous, glabrous, truncate; blades flat or folded, usually glabrous, adaxial surfaces sometimes scabrous or shortly pubescent. Inflorescences panicles, diffuse to dense and spikelike, with few spikelets; branches 0.7-3.5 (8.5) cm, smooth, stiff, erect to reflexed, secondary branches usually appressed. Spikelets pedicellate, slightly laterally compressed, with 1-4 (5) florets, distal florets sterile; rachillas prolonged beyond the uppermost floret or terminating in a vestigial floret, glabrous; disarticulation above the glumes and beneath the fertile florets. Glumes subequal, equaling or usually exceeding the distal florets, ovate and obtuse to lanceolate-attenuate, membranous, glabrous, 1-3-veined, unawned; calluses short, blunt, with a ring of stiff hairs, hairs to about 1 mm; lemmas ovate to ovatelanceolate, membranous to coriaceous, glabrous or pubescent, with 3 (5) fine veins, apices acute to acuminate, midveins sometimes excurrent as a mucro or awn to 1 (2.2) mm; paleas shorter than the lemmas, glabrous, sometimes scabrous on the veins; lodicules 2, membranous, glabrous; anthers 3; ovaries glabrous. Caryopses shorter than the lemmas, concealed at maturity, falling free of the lemma and palea; hila 1/6 – 1/3 the length of the caryopses, ovate, x = not clear, 7 or 11.

Distribution

Greenland, Nfld. and Labr. (Nfld.), Man., N.W.T., Nunavut, Ont., Que., Yukon, Alaska

Discussion

Dupontia is a monotypic genus of arctic and subarctic wetlands, found throughout the holarctic region except in Scandinavia. Hybrids with Arctophila are referred to xArctodupontia (see next); hybrids with Poa eminens are referred to xDupoa (see previous).

Lower Taxa

"decumbent" is not a number.

... more about "Dupontia"
membranous +  and scarious +
pubescent +  and scabrous +
acute +  and acuminate +
Jacques Cayouette +  and Stephen J. Darbyshire +
R. Br. +
1 (?) +  and 3 (?) +
2.2 cm22 mm <br />0.022 m <br /> (?) +
straight +
basal +  and terminal +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not evident +
folded +  and flat +
8.5 cm85 mm <br />0.085 m <br /> (?) +
erect;reflexed +
spikelike +
0.7 cm7 mm <br />0.007 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
hairy +  and glabrous +
not branching +
ascending +  and erect +
5 cm50 mm <br />0.05 m <br /> (80 cm800 mm <br />0.8 m <br />) +
not woody +
Greenland +, Nfld. and Labr. (Nfld.) +, Man. +, N.W.T. +, Nunavut +, Ont. +, Que. +, Yukon +  and Alaska +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
1 +  and 4 +
compressed +
reduced +
shorter or longer +
subtending +
obtuse +  and lanceolate-attenuate +
subequal +
membranous +
usually exceeding the distal florets +  and equaling +
uncinate +
1/6 +  and 1/3 +
1-7(9)-veined +
pubescent +  and glabrous +
ovate +  and ovatelanceolate +
membranous +  and coriaceous +
membranous +
inconspicuous +
lanceolate +
concealed +  and prominent +
2 +  and 1 +
well-developed +
2-keeled +
spikelike +
dry +  and fleshy +
brysting2003a +, brysting2004a +  and jurtsev1995a +
compressed +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Dupontia +
Poaceae tribe Poeae +
membranous +
parallel +  and converging +
aquatic +  and terrestrial +