THE FLORA OP LIVERPOOL. 



Tribe 3. CORYMBIFER^. Juss. 

 " Florets of the same head all homogamous (and usually 

 tubular) ; or those of the circumference filiform or tubular and 

 pistilliferous, or ligulate. Style of the perfect florets not 

 swollen below its branches." (Gen. 20 — 37.) 



Sub-tribe 1. Tdbiflorj<:. "Heads discoid." 

 (Gen. 20—26.) 



20. BIDENS. Linn. Bur-marif/old, 

 Syngenes. JEqualis. Linn. 



1. B. cernda. L. (Nodding B.) July — September. 



Sides of ponds, ditches, &c., frequent 



2. B. TRIPARTITA. L. (Trifid B.) July — September. 



In similar situations with the former, but more common, 



2L TANACETUM. Linn. Tansy, 

 8yn genes. 8uperfiua. Linn. 



1. T. vulgare. L. (Common T.) July, August. 11 



On hedge banks, verj' frequent. Very abundant on every 

 ditch, brook, and pond-side on Gill Moss, and the noilhem 

 side of Croxteth-park,— W.H. 



" The larrn of Papilio Machaon (the Swallow-tail), and CucuUia Tancieeti, (the 

 Tansy), feed upon this plant. Also the larva and perfect insect of Chruomela fvlgida." 



22. ARTEMESIA. Linn. Wormwoody Southerntooody Mugwort, 

 Syngenes. Superjiua. Linn. 



1. A. VULGARIS. L. (Common M.) July — September. 4 



Borders of fields, hedge-banks, and waste-places, common. 



2. A. Absinthium. L. (Common W.) August. 2^ 



Fonuerly at Bidston, but now (1851) destroyed. Near 

 Hoylake, not common, — W.S. Poulton, near the hotel. 



" The Iftrvaj of Polia dytodea (the Kaniincaliis), Cidaria munitata (the Rufiis 

 Carpet), Plerophoru* microdactyltu (the Small Plumo), Pterophonts ietradaetylus (the 

 white-shafted Plume), and CucuUia Ahtinthii (the Wormwood), f<>ed on this plant" 



73 



