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2 Perennial; achenes dark brown, with an acute apex and lacking a mucro; tepals 2.0-3.5 mm long, longer than the involucral bracts (1.5-2.5 mm long); [exotic weed]; [subgenus Parietaria] | |
2 Annual; achenes light brown, the apex rounded but with an apical mucro; tepals 1.5-2.0 mm long, shorter than the involucral bracts (1.8-5.0 mm long); [native, sometimes weedy]; [subgenus Freirea]. | |