72 



INFLORESCENCE. 



350. The corymb differs from the raceme in having the lower pedi- 

 cels lengthened so as to elevate all the flowers to about the same level, 

 as in the wild thorn. 



207 205 204 206 203 



203, Andromeda racemosa ; flowers in a secund raceme. 204, Yerbascnm Blattaria; raceme. 

 905, Lolium perenne ; a compound spike or a spike of spikclets. 206, Dipsacus sylvestris ; head 

 with an involucre of leaves. 207, Osmorhiza longistylis ; a compound umbel. 20S, Its fruit. 



351. An umbel consists of several pedicels of about equal length 

 radiating from the same point, the top of the common peduncle, as 

 milk-weed, ginseng, onion. When the pedicels of an umbel become 



209 210 



tOO, Btophylea trifolla ; a pendulous, paniculate cyme. 210, Catalpa ; a panUle. 



