Cortaderia selloana
pampas grass, silver pampas grass, Uruguayan pampas grass
2-4 m, usually 2-4 times as long as the panicles.
primarily basal;
sheaths mostly glabrous, with a dense tuft of hairs at the collars;
ligules 1-2 mm;
blades to 2 m long, 3-8 cm wide, mostly flat, cauline, ascending, arching, bluish-green, abaxial surfaces glabrous basally.
30-130 cm, only slightly, if at all, elevated above the foliage, whitish or pinkish when young.
15-17 mm;
calluses to 1 mm, with hairs to 2 mm;
lemmas long-attenuate to an awn, awns 2.5-5 mm;
paleas to 4 mm;
stigmas exerted.
and florets not separating easily from the rachilla.
= 72.
Cortaderia selloana
Cortaderia selloana is native to central South America. It is cultivated as an ornamental in the warmer parts of North America. It was thought that it would not become a weed problem because most plants sold as ornamentals are unisexual, but it is now considered an aggressive weed in California and Bendigo, Australia. The weedy Australian plants are bisexual (Walsh 1994).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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