LINN/EAN ARTIFICIAL SYSTEM. Ijl 



pistil, and thereby capable of bringing their seed to 

 maturity, without the assistance of any other florets. 

 Here we shall meet with the old-man 's-beard, goats-beard, lamb's- 



liawk-weed, hawk's beard, cat's-ear. nipple-wort, succory, bin- 

 dock, sow-wort, thistle, cotton-thistle, artichoke, golden-locks, and 

 many other well-known families of plants. 



124. Polygamia superflua: With the vegetables of 

 this subdivision, the florets in the centre or disk are 

 perfect or united ; while those of the circumference or 

 margin, are furnished with pistils only. Notwithstanding 

 the outer florets have only pistils, they are still impreg- 

 nated witli the pollen from the stamens of the disk, and 

 consequently produce seed. 



The most common tribes of plants belonging to this order, are the 

 genera tansy, wormwood, everlasting or cud-weed, flea-bane, colt's- 

 i'oot, groundsel, star-wort, golden-rod, inula, leopard's-bane, daisy, 

 chrysanthemum, feverfew, chamomile, milfoil, ox-eye, and several 

 others. 



125. Polygamia frustranea ; In the flowers of this 

 order, the florets of the disk or centre, are perfect or 

 supplied with both the stamens and pistil, while the flat 

 florets (sometimes called semi-florets} of the margin 

 or circumference are neuter, that is, are destitute 

 both of stamens and pistils. There are a few genera, 

 however, with the rudiments of pistils in their outer 

 florets. 



The common sunflower, Jerusalem artichoke, family of coreopsis 

 or tick-seed-sunflower, sweet and yellow sultan, black knapweed, 

 blue-bottle, blessed-thistle, star-thistle, and St. Barnaby's thistle, 

 aie tbe most familiar illustrations we ccn name. 



