Difference between revisions of "Nassella trichotoma"
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|accepted_name=Nassella trichotoma | |accepted_name=Nassella trichotoma | ||
| − | |accepted_authority=(Nees) Hack | + | |accepted_authority=(Nees) Hack. ex Arechav. |
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|common_names=Serrated tussockgrass;Yass tussockgrass | |common_names=Serrated tussockgrass;Yass tussockgrass | ||
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name=Nassella trichotoma | name=Nassella trichotoma | ||
| − | |authority=(Nees) Hack | + | |authority=(Nees) Hack. ex Arechav. |
|rank=species | |rank=species | ||
|parent rank=genus | |parent rank=genus | ||
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|special status= | |special status= | ||
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|subfamily=Poaceae subfam. Pooideae | |subfamily=Poaceae subfam. Pooideae | ||
|tribe=Poaceae tribe Stipeae | |tribe=Poaceae tribe Stipeae | ||
Latest revision as of 19:52, 1 December 2021
Plants perennial; cespitose, not rhizomatous. Culms 20-60 cm tall, about 1 mm thick, erect, internodes glabrous; nodes 2-4, pubescent. Sheaths 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. Panicles 8-25 cm, open, lax, sparse; branches 2-6 cm, with 1-8 spikelets; pedicels 3-12 mm. Glumes 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. Caryopses about 1.2 mm, oblong, dark brown. 2n = 36.
Distribution
Ill., Ky., N.C., S.C.
Discussion
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.
Selected References
None.