528 WM. T. BRIGIIAM ON HESPEROMANNIA. 



Of the arborescent composite, which exceed twenty-five feet, only four are known ; — 

 Yemonia celebica, V. Blumeana, St/nchodendron rarmflorum, which attain fifty or sixty feet, and 

 Melanodendron integrifolium, of which the height is not known, but the trunk is five or six 

 feet in circumference. Those compositae, which are about twenty feet high, are represented 

 principally by the following list, which is, however, by no means complete : — 



Brachyglottis, New Zealand. 



Microglossa altissima, Madagascar. 



Commidendron (5 species), St. Helena. 



Petrobium, " " 



Lachanodes (3 species), " " 



Robinsonia (4 species), Juan Fernandez. 

 Rea (7 species), " " 



Raillardia (4 species), Hawaiian Islands. 

 Hesperomannia, " " 



The relation this genus bears to the other Hawaiian Compositae may be seen from the 

 following statistics : — 



Genera, 24 

 Species, 59 



Endemic genera, 6 Genera of endemic species, 8. 



" species, 46 



Of the Phoenogamous Flora the Compositor form one tenth of the genera and about the 

 same proportion of the species. The largest number of species to a genus is eleven, and 

 the genera of more than one species are represented thus : — 



t Raillardia, 11 Bidens, 4 



Lipochasta, 10 t Dubautia, 3 



Vittadinia, 7 t Argyroxiphium. 2 



t Campylotheca, 5 



These seven genera represent forty-two species, and the four endemic genera, marked -f, 

 twenty-one species. The six endemic genera, Raillardia, Campylotheca, Dubautia, Argyro- 

 xiphium, Wilkesia and Hesperomannia, have twenty-three species, or an average of nearly 

 four. Ten species belonging to nine genera have probably been introduced in recent times. 



Explanation of Plate XX. 

 a Corolla, b Achenium. c Corolla unfolded, d Stamen, e Pistil. 



Published December, 18G8. 



