Flora of North America species comparison

(15)30-100 cm, bases dull brown, glabrous;

nodes 2-4; branching intravaginal.

15-85 cm, glabrous, bases dull gray-brown;

nodes 2-6;

basal branching mostly extravaginal, lower nodes sometimes with intravaginal branches.

mostly glabrous, scabridulous, basal sheaths dull brown;

ligules 0.3-1 mm, truncate, erose, abaxial surfaces glabrous or almost so, ciliate, hairs longest (to 2 mm) towards the sides of the leaves, at the top of the sheaths;

blades (3)10-40 cm long, 0.5-1 mm wide, all alike, straight, erect, convolute, apices sharp.

glabrous, basal sheaths dull gray-brown;

ligules 0.1-0.2 mm, truncate, abaxial surfaces puberulent, ciliolate to ciliate, hairs longest (1.5-4 mm) towards the sides of the leaves, at the top of the sheaths;

blades 1-9(25) cm long, those of the innovations the longest, 1-1.5 mm wide and flat or conduplicate, or to 0.5 mm in diameter and convolute, straight to almost falcate, abaxial surfaces of the innovation leaves glabrous or pubescent, adaxial surfaces usually glabrous, sometimes slightly scabrous.

(3)10-25(30) cm, narrow, cylindrical to lanceoloid, dense, from partially to wholly exserted at anthesis, erect or nodding distally;

branches strongly ascending.

3-20 cm, ovoid, lax, partially included in the upper leaf sheaths;

branches ascending to divergent;

pedicels 1-1.5 mm.

5.5-11 mm.

5-8 mm.

subequal, clearly exceeding the florets, linear-lanceolate, tapering to attenuate apices;

lower glumes 5.5-11 mm, 1-3-veined;

upper glumes 5-10.5 mm, 3-veined;

florets 2.3-3 mm, cylindrical to fusiform;

calluses 0.2-0.4 mm, acute to broadly acute, strigose;

lemmas hairy throughout, hairs on the lower portion about 0.15 mm, sparse, appressed, pappus hairs 3-4 mm;

awns 9-15 mm, twice-geniculate, first 2 segments twisted, scabridulous;

paleas 1-1.5 mm, sparsely pubescent, 2-veined, apices rounded;

lodicules 2, 0.6-1 mm;

anthers about 0.8 mm.

from shorter than to subequal to the florets, linear-lanceolate, hyaline, smooth, ecostate or with 1 inconspicuous vein, apices attenuate;

lower glumes 2.5-5 mm;

upper glumes 4.5-6.5 mm;

florets (4)5-7.5 mm;

calluses 1-1.5 mm, strigose, hairs white;

lemmas about 0.3 mm thick, mostly scabrous, strigose over the midvein, tapering to the apices, pappus hairs 5-8 mm;

awns 15-30 mm, scabrous, weakly geniculate;

paleas 1-2.5 mm, from 1/3 - 1/2 the length of the lemmas, hyaline, glabrous, weakly 2-veined;

lodicules 2, 0.8-1 mm, linear.

1.8-2.2 mm long, 0.6-0.7 mm thick, cylindrical.

4-5 mm, narrowly lanceoloid.

= 40.