284 Class XIX. Order III. 



324. ANTHEMIS. Receptacle chaffy; seeds crowned 

 with a slight border ; calyx hemispherical ; florets of 

 the ray more than five, oblong. 



325. ACHILLEA. Receptacle chaffy ; down none ; 

 calyx ovate, imbricate, unequal ; florets of the ray 

 from five to ten, inversely heart shaped or roundish. 



Order III. FRUSTRANEA. Florets of the centre, 

 with stamens and pistils, fertile ; those of the ray with pistils 

 only, barren. 



326. HELIANTHUS. Receptacle chaffy ; seeds crown- 

 ed with two lanceolate, chaffy scales ; calyx imbricate, 

 somewhat squarrous. 



327. COREOPSIS. Receptacle chaffy ; seeds com- 

 pressed, emarginate, with two unarmed arms ; calyx 

 double, each many leaved. 



328. RUDBECKIA. Receptacle conical, paleaceous ; 

 down with a four toothed margin ; calyx with a double 

 row of scales. 



329. CENTAUREA. Receptacle bristle ; down hairy ; 

 rays funnel-shaped, irregular ; calyx various. 



Order IV. JVESESSARM. Florets of the centre 

 with stamens and pistils, barren ; those of the ray with pistils 

 only, fertile. 



330. IVA. Receptacle hairy ; seeds naked, obtuse ; 

 down none ; calyx three leaved 5 florets of the ray 

 five. 



