Classification of Plants 



271 



Helipterum differs form Helichrysum in having feather- 

 like pappus. 



AAAA. Anthers without tail^. PapjJi^ bristles abundant. 

 Involucre in one row — 



Senecio. — Heads with or without rays, purple or yellow. 



The genus may be known by the involucre of one row of scales 



with a few small bracts at the base. Shrubs or small trees. 



Othonna. — Rays yellow or purple. Involucre as in 



Senecio, without bracts. Shrubs or 



>\ herbs with smooth shiny leaves. The 



rM herbs often have tuberous roots. 



Fig. 273. — Osteospermtiin moni- 

 tiferum. fruits ; the ray flowers 

 produce large achenes with 

 bony seeds ; the disc-flowers 

 are sterile. 



Fig. 274. — Three-winged fruits of Tripteris. 



AAAAA. Anthers with short tails. Pappus none — 

 Dimorphotheca. — Heads with rays. Involucre in one 



row. The genus may be readily recognized by the two kinds 



of fruit. Those of the ray flowers are slender, three-cornered ; 



of the disc flowers, flattened, heart-shaped, with thick, wide 



wings. • 



Herbs or half shrubs, often sticky, with yellow or purple flowers, or 

 white with purple underneath. 



Osteospermum. — Heads yellow, many flowers with rays. 

 Only the ray flowers bear fruits, which contain white, bony 

 seeds. Shmbs, rarely herbs, with alternate leaves, which may 

 be cobwebby, or rough with sticky hairs, or smooth. 



Tripteris. — Heads with ray flowers, which bear the fruit. 



