568 226. COMPOSITAE 



237. Style of the central flowers 2-cleft. Involucral bracts finally free. 



Undershrubs. — Species 7. South and North Africa. Some are used as 

 ornamental plants. [OtJionnopsis Jaub. et Spach) . . Hertia Less. 

 Style of the central flowers undivided. Involucral bracts more or less 

 united. — Species no. South Africa and southern Central Africa- 

 Some arc used as ornamental plants. (Including Doria Less.) 



Othonna L. 



238. (200.) Style-branches of the hermaphrodite flowers rather long, semi- 



cylindrical, covered with stigmatic papillae on the inner surface, with 

 hairs on the outer ; hairs also clothing the upper part of the style below 

 the point of division. Anthers more or less arrow-shaped. . . . 239 

 Style-branches of the hermaphrodite flowers with marginal rows of 

 stigmatic papillae, hairy only in their upper part, more rarely down to the 

 point of division ; no hairs on the upper })art of the style below that 

 point 2O2 



239. Heads with inner hermaphrodite and outer female flowers 240 



Heads with all the flowers hermaphrodite, rarely {Vernonia) subdioecious 



by incomplete development of one sex 242 



240. Female marginal flowers with a thread-shaped corolla. Style-branches 



blunt. Pappus of bristles. Herbs. — Species 17. Tropical and 



South Africa and Egypt Laggera Schultz 



Female marginal flowers with a strap-shaped corolla. Flowers yellow. 

 Receptacle pitted 241 



241. Pappus of scales. Involucral bracts united at the base. Leaves prickly, 



(See 37.) Berkheya Ehrh. 



Pappus of bristles. Involucral bracts free. Shrubs. Heads solitary. 

 (See 138.) Eremothamnus O. Hoffm. 



242. Flowers yellow 243 



Flowers white, red, or blue 244 



243. Pappus of scales. Involucral bracts united at the base. Leaves prickl}'. 



(See 37.) Berkheya Ehrh. 



Pappus of bristles. Involucral bracts free. — Species 7. Central Africa. 

 (Including Autunesia O. Hoffm. and Newtonia O. Hoffm., under Vernonia 

 Schreb.) Gongrothamnus Steetz 



244. Receptacle with scales between the flowers. Leaves linear or lanceo- 



late 245 



Receptacle glabrous, rarely ciliate, bristly, or with toothed borders to the 

 pits, without scales between the flowers. Stj'le-branches rather long 

 and pointed. [Tribe VERNONIEAE.] 247 



245. Heads solitary. Scales between the flowers membranous. Style- 



branches rather long and pointed. Pappus of unequally broad scales. — 

 — Species i. West Africa (Congo). . . Dewildemania O. Hoffm. 

 Heads in corymbs. Scales between the flowers with a coloured appendage. 

 Style-branches short, blunt or somewhat pointed. Pappus of scales 

 united into a toothed cup 246 



