- 8 - 



0.35-8.0 cm long. 



18. Leaves 1.0-3.5 mm wide, 

 often rufescent (reddish- 

 brown) ; apex rounded 

 (fig. 17C) or slightly 

 apiculate; fruits with 

 dorsal keel or ridge 

 (fig. 17B) . 

 15. P^ obtusifolius 



18. Leaves 0.2-2.5 mm wide, 

 usually green; apex obtuse 

 (fig. 19B) , apiculate 

 (fig. 19D) or acute 

 (fig. 19F) , fruits with a 

 rounded dorsal surface, 

 (figs. 18F, 191) . 



19. Leaves with up to 2 rows 

 of lacunae along both 

 sides of the midrib 

 (fig. 19F) , apex acute 

 (fig. 18E) , rarely 

 apiculate; stipules 

 mostly connate (united, 

 surrounding stem) 

 peduncles mostly 

 terminal, 1.0-6.2 cm 

 long, 1-3 per plant; 

 inflorescence usually of 

 2-4 distinct, inter- 

 rupted whorls 

 (fig. 18A) . 



16. Pj^ pusillus 



var . pusillus 



19. Leaves with up to 5 rows 

 of lacunae on both sides 

 of midrib, apex obtuse 

 (fig. 19B) to acute 

 (fig. 19F) ; stipules 

 mostly convolute 

 (rolled); peduncles 

 axillary or terminal, 

 0.5-4.6 (-6.6) cm long, 

 more than 3 per plant; 

 inflorescence crowded 

 (fig. 19A) . 



17. Pj^ pusillus 



var . tenuissimus 



17. Leaves 0.2-0.7 mm wide, apex 

 acute (fig. 20C) , leaves 

 1-veined; peduncles 1.0-3.5 cm 

 long. 

 18. P_j_ pusillus 



