1. Culms terete or several-ridged, smooth; anthers 1.1–2.5 mm long (not including a short prolonged tip); body of achenes 1.5–1.7 mm long.

T. cespitosum

1. Culms 3-angled, scabrous; anthers 0.6–1.1 mm long; achenes various.

2. Perianth bristles ciliate, slightly or not at all exceeding the blunt achene; scales of spikelet not more than 7; achenes ca. 1.6–1.8 mm long.

T. clintonii

2. Perianth bristles smooth, several times as long as the apiculate achene at maturity; scales of spikelets slightly more than 7; body of achene less than 1.5 mm long.

T. alpinum

All species found in Trichophorum

Trichophorum alpinumBULRUSH 
Trichophorum cespitosumBULRUSH 
Trichophorum clintoniiCLINTON'S BULRUSH 


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 2, 2022.