This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol1", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Lycopodium inundatum var. adpressum Chapm.
Torrey Club 27: 153. 1900. Lycopodium Chapmani Underw. Proc. U. S. Nat.
Mus. 23: 646. 1901.
Stems prostrate or slightly arching, 6'-16' long, simple or rarely branched, leafy; peduncles 4'-12' long, slender, rigidly erect, arising directly from the creeping stem, terminated by a slender spike 9"-2|' long; leaves of the stem lanceolate-acuminate, curved upwards, irregularly toothed, sometimes doubly so; leaves of the peduncle more slender, incurved, mostly appressed, yellowish green or stramineous, the lower ones sharply toothed, the upper ones entire or nearly so; sporophyls mostly incurved and subappressed, abruptly subulate from an ovate more or less toothed base.
Moist banks and borders of swamps, New York to the Gulf states, mainly near the coast.
Lycopodium alopecuroides L. Sp. PI. 1102. 1753.
Stems stout, mostly recurved and more or less prostrate, elongate, 1°-2° long, densely leafy throughout; peduncles very stout, 8'-13' long, erect, arising usually from the arches of the sterile stems, terminating in stout densely leafy spikes 9'-4' long, 4"-5" thick; leaves of the stem spreading, lanceolate-attenuate to linear-subulate, conspicuously bristle-toothed, especially below the middle, and hairy below near the base; leaves of the peduncle similar, spreading or ascending; sporophyls similar but broader at the base, longer, with long setaceous tips, ascending, spreading, or eventually re-flexed, not hairy below.
In pine-barren swamps, New York to Florida, near the coast, west to Mississippi. Aug.-Oct. In tropical America.
Lycopodium obscurum L. Sp. PI. 1102. 1753.
L. dendroideum Michx. Fl. Bor. Am. 2: 282. 1803.
Main stem creeping horizontally, deep in the ground, giving off a few distant upright aerial branches, these 4'-10' high, tree-like, with numerous bushy branches; leaves 8-ranked on the lower branches, 6-ranked on the terminal, spreading, curved upwards, linear-lanceolate, twisted, especially above, the upper branches thus more or less dorsiventral, sometimes conspicuously so; sporophyls broadly ovate, acuminate, the margins scarious, erose.
In moist woods, Newfoundland and Labrador to Alaska, south to the mountains of North Carolina and to Indiana. Ascends to 4000 ft. in Virginia. Also in Asia. July-Sept. Spiral-pine, Tree-like-club-moss, Bunch-evergreen, Crow-foot.