GLASS XVIII. ORDER III. 93 



dric : egret none. 49. 55 — chamomilla, (wild cha- 

 momile) leaves pinnate and doubly-pinnate. 



Anthemis. Calyx hemispherical, nearly equal : 

 egret 0, or a membranous margin ; florets of the 

 ray more than 5 : receptacle chaffy, the chaffs flat, 

 with a rigid acuminate apex. 49. 55 — co^m/c, (may- 

 weed) receptacle bristly, leaves doubly-pinnate, 

 leafets 3-parted. 0. w. — arvensisy divisions of 

 leaves lance-linear. <v). w — nobilis^ (chamomile) 

 receptacle chaffy, leafets 3-parted linear-subulate. 

 O/.e. 



Achillea. Calyx imbricate, ovate : egret ♦ 

 receptacle chaffy : florets of the ray 4 to 10, dilat- 

 ed. (Flowers corymbed.) 49. 55 — millefolia, (yar- 

 row) leaves doubly-pinnatifid, stem groved. 11. w. 



Verbesina. Calyx in double order ; receptacle 

 ehaffy: florets of the ray about 5 : egret awned. 

 49. 55 — sig-esbeckia, (crown-beard) leaves decurrent 

 opposite lance-ovate serrate. 2/ . y. 



Order III. Polygamia Frustranea. 



RuDBECKiA. Calyx with a double order of 

 scales : receptacle chaffy, conic : egret a 4-toothed 

 margin or 0. 49. 55 — iaciniata, (cone flower) leaves 

 pinnate, stem-leafets oblong, with the egret. 11. y. 

 ^—/lur/iurea^ leaves lance-ovate alternate undivided, 

 ray-petals 2-cleft. 2/. p. — triloba, leaves spaiulate, 

 lower ones o-lobed, upper ones undivided. % . y. 



Helianthus. Calyx imbricate, sub-squarrose, 

 leafy: receptacle flat, chaffy: e^ret 2 -leaved, ca- 

 ducous. 49. 55 — annuusy (sunflower) leaves all 

 cordate 3-nerved, flowers drooping. ©. y. — deca/ie- 

 talus, leaves ovate, stem smooth below, peduncles 

 scabrous, ray about 10-petalIed. 2/.y. — divaricatus, 

 leaves opposite sessile ovate-oblong, panicle fork- 

 ed. 2/. y — altissimus, leaves alternate lanceolate, 

 petioles ciliate. 2/.- y. — tuberosus^ (Jerusalem arti- 



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