Vili PREFACE. 
Cute and the parts of SOUTH AMERICA BEYOND THE TROPIC have . 
been well investigated by Douglas, Cuming, Mathews, Cruckshanks, 
Bridges, Tweedie, Gillies and others, all of whose collections have 
been carefully studied ; but there are many of the species mentioned 
by Poppig, which the author has never seen. 
The NonTH or Arrica possesses few species of this order not 
common to the South of Europe, Salzmann's collections from 
Tangiers, Dr. Leman's in Madeira, some kinds met with by Bové 
near Algiers, and Mr. Webb's Canary herbarium have furnished the 
author with the greater part of them. 
His knowledge of the species of Tropicat Arrica is principally 
derived from plants found by G. Don at Sierra Leone, a few from 
Cape Coast Castle and the Isle of France in the Herbarium of Sir 
W. Hooker, some Madagascar species gathered by Dr. Lyall, and 
preserved in the same rich magazine, and from the English gardens, 
where several have from time to time produced their flowers. The 
author has not, however, been so fortunate as to meet with much 
to elucidate the obscure species of Du Petit Thouars, from the 
Isle of France, Bourbon, and Madagascar, and he earnestly solicits 
assistance with respect to those islands. 
Of Care species his examination has been pretty complete. The 
beautiful plants found by Mr. Drége and most admirably preserved, 
have been placed at his disposal by that liberal botanist; besides 
which he has been able to study the species of Dr. Burchell, 
communicated by himself, of Mr. Harvey, of Forbes, of Ecklon, 
and of some of the older collectors preserved in the herbaria of 
Vahl, Hornemann, and Lehmann, for which he has been indebted 
to the two last eminent naturalists. 
In the WARMER PARTS OF Asia, copious materials have been 
furnished. Ceylon species in abundance were communicated by 
the late Mr. Macrae, besides which the herbarium formed by 
Col. Walker in that island has been consulted. The vast collections 
of botanists, travelling under the patronage of the East India Com- 
pany, have been most liberally given up to unrestricted examination 
by the Honourable Court of Directors of the East India Company ; 
besides which the author has been largely indebted to the private 
friendship of Drs. Royle, Wallich, and Wight, and of Mr. Griffith. : 
By these means the Flora of the Himalaya, of a great part of 
Hindostan, of Burma, Assam, and some parts of the Malayan 
Archipelago, has been extensively incorporated in this work. -Jt 
is, however, a subject of great regret to the author that the 
