Agrostis stolonifera |
Agrostis scabra(synonym of Agrostis hyemalis) |
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creeping bentgrass |
ticklegrass |
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Habit | Plants perennial, (8)15–60 cm tall; stolons rooting at the nodes and sometimes forming a dense mat. | Plants perennial or rarely annual, (7.5)15– 90 cm; cespitose. |
Leaves | ligules of sterile shoots longer than wide; basal ligules 0.7–4 mm; upper ligules 3–7.5 mm; blades 2–10 cm × 2–6 mm; flat. |
ligules 0.7–5 mm; tips usually rounded, sometimes truncate or acute; erose-ciliate; blades 4–14 cm × 1–2 mm; basal blades mostly involute; cauline blades usually flat. |
Inflorescences | (3)4–20 × 0.5–3(6)cm, contracted, oblong to lanceolate, with 1–7 branches at the lowest node; branches ascending to appressed, contracted after anthesis; some branches at each node spikelet-bearing to the base. |
(4)8–25(50) × 0.5–20 cm; diffuse, often almost as wide as long; lowest node with (1)2– 7(12) branches; branches capillary; flexible, strongly spreading, not spikelet-bearing and usually not branched on the lower 50%, dark purple; lower branches 4–12 cm; disarticulation at the panicle base and beneath the florets. |
Glumes | 1.6–3 mm, 1-veined; tips acute to acuminate or with a minute point. |
1-veined; keels scabrous at least distally; tips acuminate; lower glumes 1.8– 3.4 mm; upper glumes slightly shorter. |
Calluses | with sparse hairs to 0.5 mm. |
with sparse hairs to 0.2 mm. |
Lemmas | 1.4–2 mm; smooth, 5-veined; veins sometimes excurrent to about 0.1 mm; tips acute to obtuse, often entire, usually awnless; lemma awns; if present, 0–1 mm long, arising near the tip; straight. |
1.4–2 mm, scabrous to smooth, 5-veined; veins extended into minute teeth; tips acute to obtuse, usually entire; awnless or awned; lemma awns; if present, 0.2– 3 mm, arising below mid-length; bent or straight. |
Paleas | 0.7–1.4 mm; at least as long as the lemmas. |
absent or to 0.3 mm. |
Anthers | 3, 0.9–1.4 mm. |
0.4–0.8 mm, usually not retained after anthesis. |
2n | =28. |
=42. |
Agrostis stolonifera |
Agrostis scabra |
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Distribution | ||
Discussion | Moist meadows, ditches, lakeshores, marshes, streamsides, ocean beaches and disturbed, moist, open areas such as pastures and clearcuts. 0–2500 m. Throughout Oregon. CA, ID, NV, WA; throughout North America; worldwide. Exotic. The more common A. gigantea is often misidentified as A. stolonifera. Agrostis stolonifera can cross with Polypogon monspeliensis. The resulting hybrid, × Agropogon lutosus, has been collected in Oregon. It is a loosely cespitose to rhizomatous plant similar to A. stolonifera, but it has glume awns to about 2 mm and lemma awns to about 3 mm. |
Moist to dry grasslands, pastures, shrub-steppe, forests and roadsides, especially in disturbed sites. 0–3000m. BR, BW, Casc, CR, ECas, Est, Lava, Owy, WV. CA, ID, NV, WA; throughout North America; Asia. Native. Agrostis scabra has a large, extremely diffuse, delicate purplish inflorescence which breaks off and rolls in the wind, dispersing seeds like a tumbleweed. The inflorescence is often more than half as tall as the entire plant. Similar A. idahoensis is a shortleaved plant of subalpine and alpine wetlands. Its lower panicle branches rarely exceed 4 cm, and the inflorescences do not break off at maturity. |
Source | Flora of Oregon, volume 1, page 354 Barbara Wilson, Richard Brainerd, Nick Otting |
Flora of Oregon, volume 1, page 354 Barbara Wilson, Richard Brainerd, Nick Otting |
Sibling taxa | ||
Synonyms | Agrostis alba, Agrostis alba var. alba, Agrostis alba var. maritima, Agrostis alba var. palustris, Agrostis alba var. stolonifera, Agrostis maritima, Agrostis palustris, Agrostis stolonifera var. palustris, Agrostis stolonifera var. stolonifera | Agrostis hyemalis, Agrostis scabra var. geminata, Agrostis scabra var. scabra |
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