Deschampsia mackenzieana

Raup
Common names: Mackenzie hairgrass
Endemic
Treatment appears in FNA Volume 24. Treatment on page 628.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants loosely cespitose. Culms 30-80 cm, smooth, glabrous, sometimes decumbent at the base and rooting at the lower nodes. Basal leaves not forming a tuft; sheaths smooth; ligules 4-7.5 mm, acute; blades 1-3 mm wide, convolute to involute, abaxial surfaces smooth, adaxial surfaces scabrous. Panicles 10-20 cm long, 8-14 cm wide; branches ascending to laxly diverging or reflexed, somewhat scabrous, longest branches at the lower nodes usually undivided for 1/3-1/2 their length. Spikelets 6-7.5 mm, bisexual. Glumes acuminate, equaling or slightly longer than the distal floret; callus hairs 1.5-2 mm; lemmas 4.5-5.5 mm, awns attached on the lower 1/4 - 2/3, inconspicuous, weakly geniculate, from shorter than to exceeding the lemma by approximately 2 mm; anthers 1.5-2.7 mm. 2n = 52.

Discussion

Deschampsia mackenzieana grows on the sandy shores and dunes around Great Slave Lake, Northwest Territories, and Lake Athabasca, Saskatchewan. The decumbent culms of some plants may be a response to shifting substrate.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Deschampsia mackenzieana"
membranous +  and scarious +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
2-4-toothed +
Mary E. Barkworth +
1 (?) +  and 3 (?) +
straight +
attached +
subapical +
inconspicuous +
geniculate +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
not evident +
convolute +  and involute +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
ascending;laxly diverging or reflexed +
spikelike +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Mackenzie hairgrass +
30 cm300 mm <br />0.3 m <br /> (80 cm800 mm <br />0.8 m <br />) +
not woody +
Conn. +, N.J. +, N.Y. +, N.Mex. +, Wash. +, Va. +, Del. +, D.C +, Wis. +, Alaska +, Ala. +, Ark. +, Calif. +, Ga. +, Mass. +, Md. +, Mich. +, Minn. +, N.C. +, N.Dak. +, N.H. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, W.Va. +, Pacific Islands (Hawaii) +, Maine +, Wyo. +, Nev. +, Colo. +, Ill. +, Ind. +, Ariz. +, Idaho +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, N.W.T. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Utah +, S.Dak. +, Mont. +, Ky. +  and Oreg. +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
viviparous +  and bisexual +
compressed +
reduced +
3-veined +  and 1-veined +
slightly longer +
subtending +
acuminate +
subequal +  and unequal +
uncinate +
(3)5-7-veined +
rounded +
2 cm20 mm <br />0.02 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
membranous +
inconspicuous +
lanceolate +  and ovatelanceolate +
concealed +  and prominent +
2 +  and 1 +
well-developed +
2-keeled +
10cm +  and 20cm +
spikelike +
8 cm80 mm <br />0.08 m <br /> (14 cm140 mm <br />0.14 m <br />) +
dry +  and fleshy +
1 +  and 60 +
compressed +
0.6 cm6 mm <br />0.006 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Deschampsia mackenzieana +
Deschampsia +
species +
membranous +
parallel +  and converging +
stoloniferous +  and rhizomatous +
annual +  and perennial +
plant +  and cespitose +
aquatic +  and terrestrial +