208 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Involucre syinnietric, attaclied centrally to the peduncle. 

 Receptacles all or partly sessile. 

 Receptacles partly' sessile and partly pedunculate on the same plant. 



7. F. cookii. 

 Receptacles all sessile. 



Leaves cuspidate at the apex, with a long acute acumen. 



8. F. panamensis. 

 Leave.s not cuspidate at the apex. 



Involucre small, about 5 mm. in greatest diameter, inconspicuous ; 



receptacles glabrous 9. F. kellermannii. 



Involucre large, conspicuous, inclosing the receptacle for half its 

 length or more ; receptacles finely pubescent or in age glabrate. 



10. F. cotinifolia. 

 Receptacles all pedunculate. 



Leaves conspicuously pubescent beneath. 



Leaf blades suborbicular, as broad as long, deeply cordate at the base, 



white-barbate beneath along the costa 11. F. petiolaris. 



Leaf blades usually conspicuously longer than broad, the pubescence 

 of short hairs scattered over the lower surface. 

 Stipules glaljrous or nearly s^) ; receptacles pyriform. Leaves cordate- 

 ovate or ovate-deltoid 12. F. palmeri. 



Stipules densely sericeous ; receptacles globose. 

 Receptacles 13 to 17 mm. in diameter ; leaf blades 6 to 19 cm. long, 



broadest at or near the middle 16. F. lapathifolia. 



Receptacles 10 to 13 mm. in diameter ; leaf blades 4.5 to 12 cm. 

 long, usually broadest at or near the base. 

 Involucre 10 to 15 mm. in greatest diameter ; receptacles with 

 fine appressed pubescence or glabrate; peduncle.^ 2 to 4 



mm. long 14. F. pringlei. 



Involucre 4 to 6 mm. in diameter; receptacles short-villo\is; 



peduncles 5 to 7 mm. long 15. F. microchlamys. 



Leaves glabrous beneath or nearly so. 

 Receptacles 4 to 12 mm. in diameter. 



Ostiole of the receptacle depressed ; leaf blades 1.5 to 4.7 cm. 



wide 17. F. padifolia. 



Ostiole plane or elevated ; leaf blades 5 to 9.5 cm. wide. 



18. F. lentiginosa. 

 Receptacles 15 to 25 mm. in diameter. 



Stipules ferruginous-sericeous 19. F. glycicarpa. 



Stipules glabrous or minutely puberulent. 

 Leaf blades cuneate-obovate, rounded at the apex. 



20. F, involuta. 



Leaf blades oblong to oval or ovate-oval, broadest at or below the 



middle. 



Leaf blades cordate or subcordate at the base, with 5 to 9 



lateral veins on each side. 



Petioles 3.5 to 7 cm. long ; leaves bright green ; receptacles 



pubescent : 21. F. jonesii. 



Petioles 1.5 to 3.5 cm. long : leaves glaucescent beneath ; re- 

 ceptacles glabrous 13. F. brandegei. 



Leaf blades rounded or emarginate at the base, with usually 

 8 to 13 lateral veins on each side. 



