SYNGENESIA.— FRUSTRANEA. Fib 



bristles, with 2 of them opposite, and mostly 

 elongated. 



493. CHRYSANTHEMUM. CaL hemispherical, im- 



bricate ; scales with membranaceous margins. 

 Recept. naked. Pappus 0. 



494. VERBESINA. CaL many-leaved ; leaflets dis- 



posed in a double series. Rays about 5. Re- 

 cept. chaffy. Pappus 2-awned. 



195. ANTHEM1S. CaL hemispherical ; scales near- 



ly equal, with scarious margins. Recept. con- 

 vex, with flat rigid chaff. Seed crowned with a 

 membranaceous border. 



196. ACHILLEA. CaL ovate, imbricate, unequal. 



Rays 5 — 10, roundish-obcordate. Seeds without 

 pappus or border. 



197. HELIOPSIS. CaL imbricate ; scales suborate, 



lined. Rays large and linear. Recept. chaffy, 

 conic ; chaff lanceolate. Seed quadrangular. 

 Pappus 0. 

 490. HELENIUM. CaL simple, many-parted. Rays 

 3-cleft. Recept. naked, globose, chaffy on the 

 margin. Seed villous. Pappus of 5-awned 

 scales. 



FRUSTRANEA. 



199. HELIANTHUS. Cat. imbricate, subsquarrose.. 

 leafy. Recept. chaffy, flat. Pappus chaffy, 2- 

 leaved, caducous. 



500. RUDBECKIA. CaL subequal, mostly double. 



Recept. conic, chaffy. Pappus a 4-toothed mar 

 gin. 



501. BIDENS. CaL subequal, leafy or scaly at the 



base. Rays often wanting. Recept. chaffy, flat. 



Pappus consisting of 2 — 4 retrorsefy scabrous 



awns. Seed quadrangular. 

 .02. COREOPSIS. CaL double ; each many-leaved ; 



the interior equal, subcoriaceous and coloured. 



Recept. chaffy ; scales flat. Seed compressed, 



emarginate, bidcntate. 

 503. ACTINOMERIS. CaL simple, many-leaved, 



foliaceous, subequal. Rays remote, elongated, 



(4—8.) Recept. small and chaffy ; the leaflet? 



