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serrated tussock, serrated tussockgrass, yass tussockgrass

Habit Plants perennial; cespitose, not rhizomatous.

20-60 cm tall, about 1 mm thick, erect, internodes glabrous;

nodes 2-4, pubescent.


glabrous, smooth;

collars glabrous, without tufts of hair at the sides;

ligules 0.5-2.5 mm, glabrous, obtuse;

blades 15-45 cm long, 0.2-0.6 mm wide, convolute, stiff, scabridulous.


8-25 cm, open, lax, sparse;

branches 2-6 cm, with 1-8 spikelets;

pedicels 3-12 mm.


subequal, 4-10 mm long, 0.9-1.2 mm wide, narrowly lanceolate, scabridulous, apices aristate;

florets 1.5-2.5 mm long, 0.7-0.9 mm wide, terete, widest near the top;

calluses 0.1-0.3 mm, acute, strigose, hairs reaching to midlength on the lemmas;

lemmas strongly tuberculate, particularly distally, mostly glabrous, narrowing abruptly to the crown, midveins pubescent proximally;

crowns about 0.5 mm long, about 0.2 mm wide, straight-sided, rims entire or irregularly lacerate, glabrous;

awns 15-35 mm, eccentric, straight to twice-geniculate;

anthers 3, 1-1.5 mm.


about 1.2 mm, oblong, dark brown.


= 36.

Nassella trichotoma

from FNA
[BONAP county map]

Nassella trichotoma is a native of South America, and has been accidentally introduced into the United States. Because it is on the U.S. Department of Agriculture's noxious weed list, all known populations have been eliminated. New populations should be reported to the Department.

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

Source FNA vol. 24, p. 177.
Parent taxa Poaceae > subfam. Pooideae > tribe Stipeae > Nassella
Sibling taxa
N. cernua, N. chilensis, N. lepida, N. leucotricha, N. manicata, N. neesiana, N. pulchra, N. tenuissima, N. viridula
Name authority (Nees) Hack, ex Arechav.
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