82 MESSRS. HEMSLEY AND PEARSON ON 
only Order which is represented by more than two species. One- 
third of Ball's alpine collection obtained above Chicla, 4° farther 
north, was composed of members of this Order*. A similar 
predominance of the most widespread modern group of plants 
obtains at high elevations in all parts of the world. It is 
interesting to note that of these fourteen species, one only 
(Perezia caerulescens) belongs to the typically andine subgroup 
Mutisiacee. 
Of the thirty-one genera represented at and above 12,000 ft., 
two, each represented by one species only, viz., Adesmia and 
Blumenbachia, are andine t. Echinocactus, Baccharis, Perezia, 
and Bomarea are more widely distributed in America, but do not 
secur in the Old World; the two latter having their greatest 
development in the Andes. Four others, Malvastrum, Lupinus, 
Werneria, and Bystropogon, are centred in the Andes, but are 
represented in the Old World by a few outlying species. To 
these we may apply the term “Amphigean.” Azorella and 
Ourisia are confined to the Southern Hemisphere; -Azorella 
extends into the Antarctic islands, and Ourisia is represented by 
six species in New Zealand. The remaining nineteen genera are 
cosmopolitan. Expressing these results in tabular form we 
have :—- 
Andine genera 2=6-4 per cent. 
American ” 4=12°8 ,,_,, 
Ampbhigean ” 4=128 ,, ,, 
South Temperate ,, 2=64 , 4, 
Cosmopolitan ” 19=61'2 ,, _,, 
On comparing these results with those obtained by an analysis 
of the plants collected by the Fitzgerald Expedition on the 
slopes of Aconcagua below 14,000 ft., we find a larger proportion 
of endemic genera. This collection contains forty-two generat; 
of which ten are endemic in South America, and three others 
centred in the Andes but extending into North America. 
Three are at home in the South Temperate zone and four may 
* Ball, in Journ. Linn. Soc., Bot. xxii. (1885) p. 10. 
t te. endemic in South America and either confined to the Andes or 
centred therein. 
{ Burkill in Fitzgerald’s ‘ Highest Andes, London, 1899, p. 369. 
