Agrostis stolonifera L.

Family: Poaceae, Tribe: Aveneae

Pertinent Synonyms & Notes (particularly those used in California; go to GRIN for other synonyms)

Agrostis maritima Lam., A. palustris Huds.

Pertinent Common Names (particularly those used in California; go to GRIN for other common names)

creeping bentgrass

Primary Disseminule Type


Description (diagnostics are in brown)

Spikelets solitary, pedicelled (pedicels filiform, 0.5–2 mm long), consisting of 1 fertile floret, lanceolate or oblong, laterally compressed, 1.5–3 mm long, greenish or yellowish becoming brownish or purplish, disarticulating below the fertile floret.

Glumes persistent, similar, elliptic to lanceolate, exceeding apex of floret(s), membranous, shiny, gaping, keeled, 1-veined (midvein scaberulous, lateral veins absent), surface glabrous to sometimes scabrid above, apices acute, acuminate or apiculate. Lower glume 1.6–3 mm long, 1–1.1 length of upper glume. Upper glume 1.3–1.5 length of adjacent fertile lemma.

Floret: rachilla absent, callus blunt, glabrous or with a few minute hairs to 0.5 mm long.

Lemma elliptic to lanceolate, 1.3–2.3 mm long, hyaline (opaque to translucent), smooth to scabrid below, without keel, 5-veined (veins obscure or prominent distally, finely scabrous), apex acute to obtuse, entire or the lateral veins excurrent to ca. 0.1 mm long), typically unawned or rarely with a subapical straight awn to ca. 1 mm long.

Palea 0.7–1.4 mm long, 0.6–0.8 length of lemma, hyaline, 2-veined, apex obtuse to shallowly notched.

Caryopsis elliptic, terete, biconvex, 0.9–1.3 mm long x 0.3–0.5 mm wide, smooth, brown, embryo <0.25 length of caryopsis, hilum linear, 0.9 length of caryopsis.

Similar Species

Agrostis avenacea

Risk Assessment (codes in yellow or red indicate cause for concern; assessments are current as of mid-2011; click AUQP, NZBORIC, or NZBPI for access to the most recent versions of these databases and possible assessment changes)