i6 CLASS XVIII. ORDER I. 



''—d ancle Hon (goat's beard) stemless, leaves ensi- 

 form, flower with a scape. %. y — ^lorrifolmm^ hav- 

 ing a stem. % . p. 



Apargia. Calyx imbricate : receptacle naked : 

 egret plumose, sessile. (Taken from the leontodon.) 

 49. 53 — autumnalis (false hawkweed) leaves lan- 

 ceolate smoothish tooth-pinnatifid, scape branch- 

 ing, y. Dr. Bigelow supposes it came to Boston 

 from Europe. 



Leontodon. Calyx double : receptacle naked : 

 egret plumose, stiped. 49. 53 — taraxacum^ (dande- 

 lion) leaves radical runcinate, outer calyx-leaves 

 reflexed. 2/. y- 



Prenanthes. Florets in a simple series (or in 

 one circular row :) calyx calycled : receptacle nak- 

 ed : egret simple, sub-sessile. 49. 53 — alba (white 

 lettuce) florets numerous, leaves angular and hal- 

 bert-form toothed, flowers nodding. 2^. w. — altissi^ 

 may florets about 5, leaves 3-lobed. % . y-r. — cordw 

 ta^ leaves cordate toothed ciliate. If., y. 



Lactuca. Calyx imbricate, cylindric, with the 

 mai^in membranaceous : receptacle naked : egret 

 simple, stiped : seed smooth. 49. 63 — sativa (gar- 

 den lettuce) leaves rounded, those of the stem cor- 

 date, corymbed. y. — elongata (tall lettuce) leaves 

 smooth beneath, lower ones runcinate clasping,- 

 upper ones lanceolate. ^ . m'. Dr. Bigelow calls 

 this the fire-weed ; but ihtjire-iueed is a species of 

 senecio. 



Hieracium. Calyx imbricate, ovate ; egret 

 simple, sessile : receptacle naked or sub-pilose.-— 

 (From white becoming yellowish.) 49. 53 — veaosum 



ped egret will not appear before full maturity. Pull off all 

 the germs ; if notliing is left, the receptacle is naked. But 

 whatever is left belongs to the receptacle, and gives it the 

 character of chaffy, hairy or bristly. 



