Trisetum spicatum

(L.) K. Richt.
Common names: Spike trisetum Trisete a epi
Synonyms: Trisetum triflorum subsp. molle Trisetum triflorum Trisetum subspicatum Trisetum spicatum var. pilosiglume Trisetum spicatum subsp. montanum Trisetum spicatum var. molle Trisetum spicatum subsp. molle Trisetum spicatum subsp. majus Trisetum spicatum var. maidenii Trisetum spicatum subsp. congdoni Trisetum montanum Trisetum molle
Treatment appears in FNA Volume 24. Treatment on page 748.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants perennial, with both fertile and sterile shoots; cespitose, not rhizomatous. Culms 10-120 cm, clumped, erect, usually glabrous, sometimes villous, sometimes scabridulous. Leaves mostly basal or evenly distributed; sheaths variously pubescent or glabrous; ligules 0.5-4 mm, truncate or rounded; blades (3) 10-20 (40) cm long, 1-5 mm wide, flat, folded, or involute, erect and stiff or ascending and lax. Panicles (5) 20-30 (50) cm long, (0.5) 1-2.5 (5) cm wide, spikelike to open, often interrupted basally, green, purplish, or tawny, usually silvery-shiny; branches with the spikelets evenly distributed. Spikelets 5-7.5 mm, sessile, subsessile, or on pedicels to 1.5 (3.5) mm, with 2 (3) florets; rachilla internodes 0.5-1.5 mm; rachilla hairs to 1 mm. Glumes subequal to unequal, lanceolate, usually smooth, sometimes sparsely scabrous, sometimes pilose, with wide scarious margins, apices acute to acuminate, sometimes apiculate; lower glumes 3-4 (5.5) mm; upper glumes 4-7 mm long, as long as or longer than the lowest florets, less than twice as wide as the lower glumes; callus hairs to 1 mm; lemmas 3-6 (7) mm, narrowly to broadly lanceolate, glabrous or pilose, sometimes scabridulous, apices bifid, teeth usually shorter than 1 mm, awned, awns 3-8 mm, arising from the upper 1/3 of the lemmas and exceeding the apices, geniculate, twisted basally; anthers 0.7-1.4 mm. Caryopses 1.5-3 (4) mm, glabrous. 2n = 14, 28, 42.

Distribution

Conn., Mass., Maine, N.H., Vt., Wash., Wis., Wyo., N.Mex., N.C., Alta., B.C., Greenland, Man., N.B., Nfld. and Labr., N.S., N.W.T., Nunavut, Ont., Que., Sask., Yukon, Tenn., N.Y., Pa., R.I., Nev., Va., Colo., Alaska, Ariz., Calif., Idaho, Utah, Minn., Mich., Mont., Oreg., S.Dak.

Discussion

Trisetum spicatum grows in moist meadows and forests, and on rock ledges, tundra slopes, and screes, at 0^1300 m. Its range includes both North and South America and Eurasia. Many infraspecific taxa have been based on the variation in vestiture and openness of the panicle, but none appears to be justified (see Finot et al. 2004 for a different opinion). Trisetum montanum Vasey appears to represent no more than an extreme phase. Trisetum spicatum differs from T. sibiricum in its pubescent sheaths and denser, usually narrower panicles.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number."prolonged" is not a number.

... more about "Trisetum spicatum"
42 +, 28 +  and 14 +
membranous +  and scarious +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.14 cm1.4 mm <br />0.0014 m <br />) +
bifid +  and apiculate +
Acute (?) +  and Acuminate (?) +
John H. Rumely +
(L.) K. Richt. +
1 (?) +  and 3 (?) +
straight +
basal +  and terminal +
geniculate +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
not evident +
involute +, folded +  and flat +
1mm;5mm +
spikelike +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Spike trisetum +  and Trisete a epi +
extravaginal +  and basal +
villous +  and glabrous +
10 cm100 mm <br />0.1 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
not woody +
Conn. +, Mass. +, Maine +, N.H. +, Vt. +, Wash. +, Wis. +, Wyo. +, N.Mex. +, N.C. +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. +, N.S. +, N.W.T. +, Nunavut +, Ont. +, Que. +, Sask. +, Yukon +, Tenn. +, N.Y. +, Pa. +, R.I. +, Nev. +, Va. +, Colo. +, Alaska +, Ariz. +, Calif. +, Idaho +, Utah +, Minn. +, Mich. +, Mont. +, Oreg. +  and S.Dak. +
0 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
sterile +  and bisexual +
compressed +
reduced +
shorter or longer +
subtending +
lanceolate +
subequal +  and unequal +
uncinate +
diffuse +  and dense +
distributed +
pilose +  and glabrous +
scabridulous +
lanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
rounded +  and truncate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
membranous +
inconspicuous +
usually slenderly lobed +  and fimbriate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
concealed +  and prominent +
2 +  and 1 +
pubescent +  and glabrous +
well-developed +
2-keeled +
subequal +  and longer +
membranous +
interrupted +  and open +
tawny +, purplish +  and green +
20cm +  and 30cm +
spikelike +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (?) +
0 cm0 mm <br />0 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
dry +  and fleshy +
0 cm0 mm <br />0 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
glabrous +  and pubescent +
sterile +  and fertile +
subsessile +  and sessile +
1 +  and 60 +
compressed +
0.5 cm5 mm <br />0.005 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Trisetum triflorum subsp. molle +, Trisetum triflorum +, Trisetum subspicatum +, Trisetum spicatum var. pilosiglume +, Trisetum spicatum subsp. montanum +, Trisetum spicatum var. molle +, Trisetum spicatum subsp. molle +, Trisetum spicatum subsp. majus +, Trisetum spicatum var. maidenii +, Trisetum spicatum subsp. congdoni +, Trisetum montanum +  and Trisetum molle +
Trisetum spicatum +
Trisetum +
species +
bristlelike +
membranous +
1 cm10 mm <br />0.01 m <br /> (?) +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0-2 times as wide as the lower glumes +
parallel +  and converging +
plant +  and cespitose +
aquatic +  and terrestrial +