410 



THE KINDS OF PLANTS 



A. L&ppa, Linn. Common burdock. Fig. 280. Common weed from 

 Europe, with a deep, hard root and bushy top 2-3 ft. high; leaves broad- 

 ovate, somewhat woolly beneath, entire or angled. 



24. CENTAURfiA. Star-thistle. Centaurea. 



Alternate-leaved herbs, the following annuals, with single 

 heads terminating the long branches: heads many-flowered, 

 the florets all tubular but the outer ones usually much larger 

 and sterile: scales of involucre over-lapping: torus bristly: 

 akenes oblong, with bristly or chaffy pappus. Cultivated. 



500. Centaurea Cyanus. At the left is an outer or ray floret; then follow three 

 details of a disk floret; then follows the fruit. 



C. C^anus, Linn. Corn-flower. Bachelor's button. Figs. 231, 500. Gray 

 herb: leaves linear and mostly entire: heads blue, rose or white. Europe. 



C. moshAta, Linn. Sweet sultan. One-2 ft., smooth: leaves pinnatified: 

 pappus sometimes wanting: heads fragrant, white, rose or yellow, large. 

 Asia. 



25. TUSSILAGO. Coltsfoot. 



Low stemless hairy perennials from rootstocks: scapes simple in early 

 spring, scaly-bracted, each bearing a single dandelion-like head: leaves 

 radical, appearing later, orbicular-angled or toothed, white-woolly at first: 

 ray flowers in several rows, pistillate, fertile: disk flowers tubular, stani- 

 inate, sterile: involucre nearly simple, or 1-rowed akenes of ray flowers, 

 cylindrical, 5-10-ribbed: pappus abundant, soft, hair-like, white. 



T, F&rfara, Linn. Yellow heads in very early spring before the leaves. 

 A common weed East, found in low, damp places and along cool banks. 

 Europe. 



26. SOLIDAGO. Goldenrod. 



Perennial herbs, with narrow, sessile leaves: heads yellow, rarely 

 whitish, few-flowered, usually numerous in the cluster, the ray-florets 1-16 



