284 LYCOPODIACEAE 



Leaves of the ultimate divisions of the aerial branches in 4 rows. 



4. L. alpinum. 

 Leaves of the ultimate divisions of the aerial branches in more than 4 rows. 

 Aerial branches tree-Uke. 5. L. obscurum. 



Aerial branches not tree-like, mostly loosely forking or forming compact 

 tufts. 

 Leaves of the ultimate divisions of the aerial branches in 5 rows. 



6. L. sitchense. 

 Leaves of the ultimate divisions of the aerial branches in 8 rows. 



7. L. annotinum. 

 Spikes borne on bracteate pedmicles more than 2 cm. long. 



Leaves of the divisions of the aerial branches in 4 rows. 8. L. complanatum. 



Leaves of the divisions of the aerial branches in many rows. 9. L. clavalum. 



Family 8. SELAGINELLACEAE. Little Clubmoss Family. 



1. SELAGINELLA. Little Clubmoss, Selaginella. 



stem rooting only at the base; bracts of the spike broad, thin, spreading; macrospores 



' splnulose. I. S. selaginoiries. 



Stem rooting mostly their whole length; bracts of the spike narrower and thicker, ap- 

 pressed and closely imbricate. 

 Leaves without an apical bristle. 2. S. mutica. 



Leaves with a distinct apical bristle. 



Macrospores smooth or nearly so. 3. S. montanensis. 



Macrospores with a network of thickened ridges. 

 Leaves abruptly acute; plant dense and tufted. 



Apical bristle yellowish green. 4. S. Walsonii. 



Apical bristle white. 



Apical bristle 0.3-0.4 mm. long. 5. ,3. Wallacei. 



Apical bristle 0.6-1.5 mm. long. 6. S. densa. 



Leaves gradually tapering towards the apex; stem long, loose and spreading; 

 apical bristle 0.5-1 mm. long. 7. S. Underwoodii., 



