140 PLANTS OF MASSACHUSETTS. 



RuDBECKiA. L. 17. 3. Cone Flower. 



Named after O. Rudbeck, professor of botany at Upsal, in 

 Sweden. It is a North American genus of about 15 species, of 

 whicii 12 have been introduced into England. Only 1 species 

 appears in this State. 



R. laciniata. L. Often called Thimble Flower, from the 

 length and size of the cone-part of the flower ; stem 4-6 feet 

 high, branching, smooth ; leaves rough, lower ones pinnate or 

 pinnatifid, of about 5 segments, and the upper nearly sessile, 

 ovate ; flowers large, with long and broad yellow ray-florets ; 

 woods and hedges ; August. This is a handsome plant, and is 

 introduced into some yards and gardens. 



Coreopsis. L. 17. 3. 



From the Greek for bug and resemblance, as the seed, by Its flat- 

 tish convex surface, rounded at one end, and with two little horns at 

 the other, much resembles some insect. It is almost wholly an 

 American genus, of about 30 species, 19 of which have been in- 

 troduced into England ; only 2 are found native in this State. 

 The species are rather beautiful, and of some species the flower- 

 ing continues for a long time. The species belong chiefly to the 

 southern part of North America. 



C. trichosperma. Mx. Tickseed Sunflower. Bears large, 

 yellow flowers ; stem about 2 feet high, with wing-shaped, gla- 

 brous, and opposite leaves ; swamps ; August and September. 



C. rosea. Nutt. A new species found abundantly about the 

 ponds in Plymouth. 



Two or three species of Coreopsis are now cultivated in the 

 more extensive flower-gardens, which have been introduced from 

 the South. 



Centaurea. L. 17. 3. 



The Centaur is said to have cured the wound, inflicted on his 

 foot by Hercules, with a plant of this genus, and hence the name. 



