FLORA OF THE DISTRICT OF COLUMBIA. 59 



6. LYCOPODIACEAE. Club-moss Family. 



1. LYCOPODITJM L. Club-moss. 



Spore cases borne in zones along the stem, in the axils of ordinary leaves. 



1. L. lucidulum. 

 Spore cases borne in terminal conelike spikes. 



Plants without leafy aerial branches, the long-stalked fertile spikes arising 

 directly from the prostrate creeping leafy stem. 

 Stems short-creeping, the leaves of two kinds, arranged in 4 rows, spreading; 

 stalks of the fertile spikes very slender, with minute scattered bracts. 



2. L. carolinianum. 



Stems wide-creeping, the numerous leaves alike, slender, curved upward; 



stalks of fertile spikes stout, with numerous slender incurved overlapping 



leaves 3. L. adpressum. 



Plants with numerous erect or ascending leafy branches, the spikes terminal on 



some of these. 



Leaves of the ultimate branches very slender, spreading, arranged in 6 or more 



rows. 



Stems running horizontally deep in the ground, the few distant aerial 



branches upright and treelike, with numerous bushy branches; leaves in 



6 or 8 rows 4. L. obscurum . 



Stems prostrate, creeping many feet over the ground, branching horizontally, 

 with numerous very leafy upright branches; leaves in many rows. 



5. L. clavatum. 

 Leaves of the ultimate branches minute, mostly imbricate, adnate and decur- 

 rent, arranged in 4 rows. 

 Ultimate leafy branches strongly flattened; leaves of the under row smrller 



than the others and of different form 6. L. complanatum flabelliforme. 



Ultimate leafy branches much narrower, appearing less flat; leaves of the 

 under row slightly smaller than the others but of similar form. 



7. L. tristachyum. 



1. Lycopodium lucidulum Michx. 



Cold damp woods and springy wooded banks, sometimes in beds of sphagnum; 

 infrequent, though of general distribution. Eastern N. Amer. 



2. Lycopodium carolinianum L. 



Cold sphagnum bog of white gravel and sand; a single locality known, Prince Georges 

 County. N. J. to the Gulf states; a Coastal Plain plant. 



3. Lycopodium adpressum (Chapm.) Lloyd & Underw. 



Bogs and low open fields, often in running water; abundant at several localities east 

 of Washington. N. Y. to the Gulf states; mainly coastal. 



4. Lycopodium obscurum L. Ground pine. 

 Moist woods and thickets; several scattered localities; not very common. Newf. to 



Alaska, south to Ga. ; also in Asia. (L. dew'roideum Michx.) 



5. Lycopodium clavatum L. Running pine. 

 Moist thickets and pine woods; apparently rare; Lanham; Sandy Springs; Merrifield. 



Most of N. Amer.; also in Eur. and Asia. 



6. Lycopodium complanatum flabelliforme Fernald. Christmas green. 

 Damp woods and thickets; fairly common. N. S. to Minn., south to Va. (Typical 



L. complanatum ranges from Me. northward.) 



7. Lycopodium tristachyum Pursh. Christmas green. Ground pine. 

 Low damp woods and thickets; not uncommon. Eastern U. S. {L, chamaecyparis- 



sus A. Br.; L. complanatum sabinaefolium of Ward's Flora.) 



