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-like. 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 peduncles 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. clavatum. 



Family 8. SELAGINELLACEAE. Little Clubmoss Family. 



1. SELAGINELLA. Litti^ Clubmoss, Selaginell.\. 



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



spinulose. 1- S. selaqinoides. 



Stem rootmg 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. ryiontanensis. 



Macrospores with a network of tliickened ridges. 

 Leaves abruptly acute: plant dense and tufted. 



Apical bristle yellowish green. 4. S. Watsonii. 



Apical bristle wliite. 



Apical bristle 0.. 3-0.4 mm. long. 5. S. Wallacei. 



Apical bristle 0.6-1.5 mm. long. 8. S. clensa. 



Leaves gradually tapering towards the ape.x; stem long, loose and spreading; 

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



