328 Key to the System of 



1471. Fruits terminated suddenly by a long and very thin 



attenuation. 



Annual, never tall, usually much beset with scattered and 

 often glandule-bearing hairlets ; leaves from narrow- 

 lanceolar to broad-linear ; headlets of flowers rather 

 large, almost hemispherical, on elongated much bracteated 

 stalks ; involucral bracts in rather few rows, the outer 

 lax, shining, whitish, glabrous ; corollas bright-yellow ; 

 seed-bearing portion of the fruit turgid, nearly smooth. 



L. medius. 



Fruits terminated gradually by a short attenuation. 



Perennial, rather tall and robust, usually much beset with 

 scattered and often glandule -bearing hairlets ; leaves 

 comparatively long, from narrow-lanceolar to broad- 

 linear ; headlets of flowers relatively large, almost hemi- 

 spherical, on much elongated and copiously bracteated 

 stalks ; involucral bracts in rather few rows, the outer 

 lax, shining, whitish, glabrous ; corollas pale-yellow or 

 almost whitish ; fruits comparatively long, glandular- 

 rough. L. elongatus. 



GNAFHALITTIVI. 



1472. Annual ... 1473 



Perennial ... ... ... 1474 



1473. Usually somewhat tall. 



Densely beset with somewhat cottony vestiture; leaves 

 flaccid, from obovate- or elliptic-cuneate to lanceolar- 

 or broadish-linear, the upper sessile ; headlets of flowers 

 crowded at or near the summit, generally unsupported 

 by floral leaves ; involucral bracts pale-yellowish, shining ; 

 fruits cylindric, glabrous. G. luteo-album. 



Always quite dwarf. 



Beset with somewhat cottony vestiture ; leaves flaccid, 

 from broad- to narrow-linear ; clusters of flower-headlets 

 surrounded by narrow leaves ; involucral bracts yellowish 

 or brownish, transparent ; fruits almost glabrous. 



G. indutum. 



1474. Headlets of flowers singly terminal. 



Alpine, dwarf, densely beset with lax somewhat cottony 

 vestiture ; leaves nearly all radical and from obovate- 

 to cuneate- or spatular-elliptical ; stem-leaves very few, 

 narrow ; involucral bracts pale-brownish or reddish, 

 shining, narrow, transparent ; fruits subtly beset with 

 hairlets. G. Traversii. 



