Setaria adhaerens (Forssk.) Chiov.

Family: Poaceae, Tribe: Paniceae

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


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

bur bristlegrass

Primary Disseminule Type


Description (diagnostics are in brown)

Spikelet subtended by a single bristle measuring ca. 5 mm long, retrorsely scabrous. Disarticulation above the bristle. Spikelet elliptic to ovate, dorsally compressed, plano-convex (D-shaped in profile), 1.5–2.2 mm long x ca. 1 mm wide x ca. 0.9 mm thick, falling entire, consisting of one fertile floret and one basal sterile floret without rachilla extension.

Lower glume ovate to triangular, <0.5 length of spikelet, membranous, enwrapping base of spikelet, without keel, 1(3)-veined, apex obtuse. Upper glume ovate, nearly length of spikelet, membranous, without keel, 5–7-veined, apex obtuse.

Sterile lemma equaling to slightly exceeding fertile lemma, membranous, apex obtuse. Sterile palea scale-like, <0.5 length of spikelet.

Fertile lemma ovate, dorsally compressed, convex in profile, ca. 1.75 mm long, whitish-yellow, usually with satiny sheen, indurate, without keel, surface finely ridged transversely, margins involute, apex acute.

Fertile palea similar to fertile lemma.

Caryopsis elliptic to ovate, ca. 1.4 mm long x ca. 0.8–0.9 mm wide, embryo <0.66 length of caryopsis, hilum round.

Similar Species

Similar Species Comparison Chart

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)