OregonFlora: Polypogon viridis vs. Polypogon australis

	Polypogon viridis	Polypogon australis
	water beardgrass	Chilean rabbitsfoot grass
Habit	Plants perennial, often flowering the first year, 10–90 cm tall.
Leaves	sheaths glabrous; smooth; ligules to 5 mm; blades 2–13 cm × 1–6 mm.
Inflorescences	ovoid-oblong to pyramidal, interrupted, 2–10 cm; pedicels not developed; stipes 0.1–0.6 mm.
Glumes	1.5–2 mm, scabrous on the back and keel; tips obtuse to truncate; awnless.
Lemmas	approximately 1 mm; tips erose; awnless.
Anthers	0.3–0.5 mm.
2n	=28.

	Polypogon viridis	Polypogon australis
Distribution	[WildflowerSearch map] [BONAP county map]	[WildflowerSearch map] [BONAP county map]
Discussion	Mesic stream banks, rivers, ditches. 0–100m. Col, WV. CA, NV, WA; north to British Columbia, southeast to TX; Eurasia. Exotic. This small grass resembles an Agrostis with unusually scabrous glumes, but its spikelets disarticulate below the glumes. Unlike other Polypogon species, it lacks glume awns. It has been collected from two sites along the Columbia River.	[This taxon does not have a floristic treatment in Flora of Oregon.]
Source	Flora of Oregon, volume 1, page 470 Barbara Wilson, Richard Brainerd, Nick Otting	Flora of Oregon, volume 1
Sibling taxa	P. australis, P. fugax, P. interruptus, P. maritimus, P. monspeliensis	P. fugax, P. interruptus, P. maritimus, P. monspeliensis, P. viridis
Synonyms	Agrostis semiverticillata, Agrostis verticillata
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Polypogon australis

water beardgrass

Chilean rabbitsfoot grass

Habit

Plants perennial, often flowering the first year, 10–90 cm tall.

Leaves

sheaths glabrous; smooth;

ligules to 5 mm;

blades 2–13 cm × 1–6 mm.

Inflorescences

ovoid-oblong to pyramidal, interrupted, 2–10 cm;

pedicels not developed;

stipes 0.1–0.6 mm.

Glumes

1.5–2 mm, scabrous on the back and keel;

tips obtuse to truncate; awnless.

Lemmas

approximately 1 mm;

tips erose; awnless.

Anthers

0.3–0.5 mm.

=28.

Polypogon australis

Distribution

[WildflowerSearch map]

[BONAP county map]

[WildflowerSearch map]

[BONAP county map]

Discussion

Mesic stream banks, rivers, ditches. 0–100m. Col, WV. CA, NV, WA; north to British Columbia, southeast to TX; Eurasia. Exotic.

This small grass resembles an Agrostis with unusually scabrous glumes, but its spikelets disarticulate below the glumes. Unlike other Polypogon species, it lacks glume awns. It has been collected from two sites along the Columbia River.

[This taxon does not have a floristic treatment in Flora of Oregon.]

Source

Flora of Oregon, volume 1, page 470
Barbara Wilson, Richard Brainerd, Nick Otting

Flora of Oregon, volume 1

Sibling taxa

P. australis, P. fugax, P. interruptus, P. maritimus, P. monspeliensis

P. fugax, P. interruptus, P. maritimus, P. monspeliensis, P. viridis

Synonyms

Agrostis semiverticillata, Agrostis verticillata

Web links