The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

nodding trisetum, tall false oat, tall trisetum

Habit Plants perennial, sometimes with both fertile and sterile shoots; cespitose, not rhizomatous.
Culms

40-120 cm, clumped, erect, usually smooth.

Leaves

3-4 per culm;

sheaths crisped-pubescent to shaggy-pilose, scabrous or smooth;

ligules (1.5)3-6 mm, rounded to truncate;

blades 10-30 cm long, (3)7-10 mm wide, flat, erect, lax, margins and occasionally the surfaces with scattered 1-3 mm hairs.

Panicles

10-25 cm long, (0.75)1-3(4) cm wide, erect or nodding at the apices, green or tan, occasionally purple-tinged;

branches 1-5.5 cm, ascending to somewhat divergent, most spikelet-bearing for their full length, sometimes the lowermost branches naked below.

Spikelets

7-9 mm, pedicellate, with 2-4 florets;

rachilla internodes 1.5-3 mm;

rachilla hairs 0.7-1 mm;

disarticulation above the glumes, beneath the florets.

Glumes

unequal to subequal;

lower glumes 3-5 mm, narrow, lanceolate to subulate, acute or long-tapered;

upper glumes (3.5)5-7(9) mm long, shorter than the lowest florets, at least twice as wide as the lower glumes, broadly lanceolate to obovate, widest at or below the middle, tapering to the apices, acute;

callus hairs about 0.5 mm;

lemmas 5-7 mm, glabrous, apices bifid, teeth to 2.5(3.2) mm, setaceous, awned, awns 7-14 mm, usually arising on the upper 1/3 of the lemmas, exceeding the apices, geniculate;

paleas as long as or slightly longer than the lemmas;

anthers 1-3 mm.

Caryopses

usually to 3 mm, glabrous or finely hairy distally.

2n

= 28, 42.

Trisetum canescens

Distribution
from FNA
AK; AZ; CA; ID; MT; NV; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
Discussion

Trisetum canescens grows on or near stream banks and in forest margins or interiors, in moist to dry areas in the western Flora region. It is especially abundant in ponderosa pine stands and spruce-fir forests. The vestiture of different parts varies throughout the range of the species. Plants from California with conspicuously interrupted panicles have been called Trisetum cernuum var. projectum (Louis-Marie) Beetle.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 24, p. 746.
Parent taxa Poaceae > subfam. Pooideae > tribe Poeae > Trisetum
Sibling taxa
T. aureum, T. cernuum, T. flavescens, T. interruptum, T. melicoides, T. orthochaetum, T. sibiricum, T. spicatum, T. wolfii
Synonyms T. cernuum subsp. canescens
Name authority Buckley
Web links