Deschampsia cespitosa subsp. holciformis

(J. Presl) W.E. Lawr.
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 cespitose, sometimes glaucous. Culms 50-125 cm. Ligules 3-4.3 mm; blades 15-30 cm long, 1-4 mm wide when flat. Panicles 10-25 cm long, 3-8 cm wide, dense; primary and secondary branches appressed to ascending, scabridulous to densely scabrous. Spikelets 5.5-8 mm, usually strongly imbricate. Glumes usually exceeded by the distal floret, often purplish over more than 1/2 their area; lower glumes 4.6-5.8 mm, midveins scabrous distally; upper glumes 4.5-5.6 mm; callus hairs 1-2.3 mm; lemmas 3.8-4.5 mm, often purplish over more than 1/2 their area, awns 2-3 mm, straight to slightly geniculate, attached near or slightly above the middle of the lemma; anthers 2.5-3 mm. 2n = 26.

Discussion

Deschampsia cespitosa subsp. holciformis grows in coastal marshes and sandy soils, from the Queen Charlotte Islands, British Columbia, to central California. It intergrades and is interfertile with D. cespitosa subsp. beringensis, differing in its closed panicles, scabrous veins on the lower glumes, and more strongly imbricate spikelets. There are relatively few collections; it is not clear whether this reflects lack of collecting or rarity.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

membranous +  and scarious +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Mary E. Barkworth +
(J. Presl) W.E. Lawr. +
1 (?) +  and 3 (?) +
0.5 cm5 mm <br />0.005 m <br /> (?) +
straight +
attached +
subapical +
geniculate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
midlength +
swelling +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
not evident +
rolled +  and folded +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
1mm;4mm +
straight +  and slightly flexuous +
spikelike +
0.1 cm1 mm <br />0.001 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
not rooting +
50 cm500 mm <br />0.5 m <br /> (125 cm1,250 mm <br />1.25 m <br />) +
not woody +
Wash. +, Va. +, Wis. +, W.Va. +, Conn. +, Mass. +, Maine +, N.H. +, N.Y. +, R.I. +, Vt. +, Wyo. +, N.J. +, N.Mex. +, N.C. +, Pa. +, Calif. +, Nev. +, Colo. +, Alaska +, 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 +, Md. +, Ohio +, Utah +, Minn. +, Mich. +, N.Dak. +, S.Dak. +, Mont. +, Ky. +  and Oreg. +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
1 +  and 2 +
viviparous +  and bisexual +
compressed +
reduced +
3-veined +  and 1-veined +
shorter or longer +
subtending +
acute +  and lanceolate +
subequal +  and unequal +
uncinate +
(3)5-7-veined +
rounded +
0.38 cm3.8 mm <br />0.0038 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
obtuse +  and acute +
0.3 cm3 mm <br />0.003 m <br /> (0.43 cm4.3 mm <br />0.0043 m <br />) +
inconspicuous +
lanceolate +  and ovatelanceolate +
0.46 cm4.6 mm <br />0.0046 m <br /> (0.58 cm5.8 mm <br />0.0058 m <br />) +
scabridulous +, or +  and smooth +
concealed +  and prominent +
2 +  and 1 +
well-developed +
2-keeled +
40 cm400 mm <br />0.4 m <br /> (?) +
10cm +  and 25cm +
ovate +  and pyramidal +
8 cm80 mm <br />0.08 m <br /> (30 cm300 mm <br />0.3 m <br />) +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
dry +  and fleshy +
5 +  and 11 +
1 +  and 60 +
bisexual +  and viviparous +
compressed +, ovate +  and v-shaped +
0.55 cm5.5 mm <br />0.0055 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
0 (?) +  and 1/2 (?) +
Deschampsia caespitosa var. genuina +, Deschampsia caespitosa var. arctica +  and Deschampsia caespitosa +
Deschampsia cespitosa subsp. holciformis +
Deschampsia cespitosa +
subspecies +
membranous +
10 cm100 mm <br />0.1 m <br /> (35 cm350 mm <br />0.35 m <br />) +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.56 cm5.6 mm <br />0.0056 m <br />) +
parallel +  and converging +
stoloniferous +  and rhizomatous +
plant +  and cespitose +
aquatic +  and terrestrial +