84 103. SELAGINELLa. a*. MONOSl'ELtCAE. a^. ascendeMtes. 



o spikes slender, 1 — iVs mm. diam. 



(46) S. Gregoryi. 

 OO Spikes stouter, Vli—2 mm. diam. 

 X Lateral leaves entire or subentire 

 toioards the apex. 

 -=- Lateral leaves spuriously 

 nerved. (47) S. similis. 



-4--=- Lateral leaves not spuriously 

 nerved. (48) S. Moszkowskii. 

 AX Lateral leaves minutely denticu- 

 late toioards the apex. 

 -f Lateral leaves of main rachis 

 rotundate-cuneate on the 

 loicer side at the base. 



(49) S. Wigmanii. 

 -^-f Lateral leaves of main rachis 



not rotundate-cuneate on the 

 lower side at the base. 



(50) S. Copelandii. 

 d.d.d. Lateral leaves more than 4 mm. long. 



(51) S. graudis. 

 3.3. Lateral leaves of the main rachis entire or at best minutely 

 denticulate-serrulate. 

 4L. Ultimate branchlets 10 — 20 mm. or more broad. 



O Lateral leaves croicded on both stem and branches. 



(9) S. alopecuroides. 

 OO At least lower lateral leaves of main rachis spaced. 



(52) S. magniflca. 

 4.<f. Ultimate branchlets 1 — 10 mm. or less broad. 



S. Intermedial leaves of principal rachises tcith at least 

 the outer base produced and distinctly incurvate- 

 (hamate-)auriculate ('). 



a. Lateral leaves of ultimate branchlets to 3 mm. 

 long. 



/3. Lateral leaves of principal rachises cuneate 

 or rounded on the upper side at the base. 



(>) See also (62) S. snngemagneana and (G3) 9. blllltonensis v. A. v. B. 



