242 Compositte—Rudbeckia. 
17. RUDBECKIA. 
(Including Echinacea and Obeliscdria.) 
North American herbaceous perennial plants with simple or 
pinnate opposite or alternate leaves and showy flower-heads of 
brightly coloured florets. Receptacle conical, with chaffy 
scales at the base of the florets. Achenes quadrangular, with a 
minute pappus or none. The species number from fifteen to 
twenty, and all are hardy or nearly so. Named after a 
Swedish botanist. 
1. R. purpivrea, syn. Echinacea serdotina, ete. (fig. 130).—A 
plant about a yard high, rough to the touch, with ovate-lanceolate 
Fig. 130. Rudbeckia purpurea, Fig. 131, Rudbeckia Drummondii 
(4 nat. size.) (4 nat. size.) 
obscurely dentate leaves and large flower-heads nearly 4 inches 
in diameter. The prominent disk is dark brown, and the ray 
bright reddish purple. 2. intermedia, with rather broader more 
