Lycopodium annotinum L., (interrupted club-moss, or stiff clubmoss) is a species of clubmoss native to forests of the colder parts of North America (Greenland, St. Pierre & Miquelon, all 10 provinces and all 3 territories of Canada, Alaska, and mountains of the contiguous United States), as well as Asia (China, Russia, Japan, Korea, Nepal, Assam), and most of Europe.
Lycopodium annotinum is a common and widespread club-moss spreading by means of horizontal stems running along the surface of the ground. It is usually unbranched or sparingly branched, each branch containing a cone at the top. Leaves have minute teeth on their edges.
A new genus, Spinulum A. Haines, has been proposed for this and closely allied species, but phylogenetic analysis has shown that this small clade is very close to the Lycopodium clavatum clade.