Skip to main content

Polypogon interruptus - ditch rabbitsfoot grass

Scientific Family
Poaceae
Synonyms
Polypogon lutosus
Plant type
Grasses
Riparian
Yes

Grass Description

Origin
Native
Season
Warm

Moist soil along streams and meadows.

Plant Community
Riparian
Low elevation
0
High elevation
7500
Similar species
Polypogon monospelensis

General Description

Tufted; stems bent at base.

Perennial with flat blades; 12 to 31 inches tall; seedhead dense, bristly, not spikelike, 2 to 6 inches long; spikelets 1-flowered. Distinguished from P. monospelensis by a seedhead that is more lobed, interrupted and shorter awned.

Grass type
Perennial bunchgrass
Rhizomes
No
Stolons
No
Clump Diameter 2 ft or more
No
Bushy - highly branched
No
Height with Seedheads
24 inches or more
Seedhead Structure
Branched - contracted
Seedhead droops
No
First bloom month
May
Last bloom month
September

Flower Characteristics

Flowers per Spikelet
One-flowered
Spikelets One-Sided
No
Awns
Less than 1/4 inch
Three Awns
No
Awns bent
No
Flower and Seedhead Notes

Spikelets have 1 fertile flower, wedge-shaped and laterally compressed, 1/8 inch long; smooth, shiny lemma that is minutely toothed; glumes awned.

Vegetative Characteristics

Blade is hairy
No
Blade margins white
No
Blade cross-section
Flat

Blades 2 to 3-1/2 inches long, 1/8 to 1/4 inch wide, broad, flat and scabrous.

Sheath is hairy
No
Tufts of hair top of sheath or collar
No
Ligule
Membranous and hairy
Auricles
No

Unknown