294 Key to the System of 



SIEGESBECK.IA. 



1334. Corolla of the marginal flowers expanding into an 



indented lamina. 



Rather tall, beset with short hairlets ; leaves from deltoid- 

 rhomboid to narrow-lanceolar, irregularly indented ; 

 headlets of flowers small, conspicuously stalked ; outer 

 involucral bracts few, usually much exceeding the inner 

 in length, beset with glandule-bearing short hairlets ; 

 expanding lamina of the marginal flowers very short, 

 yellow ; fruits somewhat turgid. S. orientalis. 



LETJZEA. 



1335. Segments of leaves mostly semilanceolar, slightly 



indented. 



Almost or quite branchless; vestiture scanty, somewhat 

 cottony or consisting of minute hairlets ; leaves occa- 

 sionally lobeless; marginal flowers also staminate and 

 pistillate ; lobes of the corolla rather long, tube very 

 slender ; fruits truncate, hardly compressed, subtle- 

 streaked. L. Australis. 



VERNONIA. 



1336. Leaves from obovate to broad-linear, imperfectly 



denticulated. 



Herbaceous, often somewhat beset with a thin rather cottony 

 vestiture ; upper leaves gradually narrower ; headlets of 

 flowers small, on slender stalks, forming terminal corymbs ; 

 involucral bracts quite narrow, acute ; fruits closely 

 invested with short hairlets. V. cilierea. 



FLUCHEA. 



1337. Headlets of flowers hemiellipsoid-cylindrical. 



Shrubby, grey from a thin close vestiture ; leaves small, 

 from spatular- to obovate-ouneate, sessile, flat, entire, in- 

 vested on both sides ; headlets of flowers singly terminal, 

 sessile ; involucral bracts in many rows, blunt ; staminate 

 and pistillate flowers mainly in separate headlets, never 

 numerous ; corollas very slender throughout ; fruits thin, 

 glabrous ; bristlets of pappus slightly plumous. 



F. couocephala. 



CALOTIS. 



1338. Comparatively tall ... ... 1339 



Dwarf 1345 



