INTRODUCTION. xl 
From the foregoing it will be seen that twenty-five, or one eighth, of the natural 
orders include much more than half the genera, as well as of the species; and all of 
them are very widely dispersed ; sixteen of them extending to the arctic regions. 
Twenty natural orders have only from one to three genera and less than ten species, 
namely :— 
Genera. Species. Genera. Species. 
Salvadoracee. . . . « 38 9 Balanopsee. . . . . . Il 8 
Sarraceniez 3 8 Mayacez dl 7 
Cyrilleze 3 8 Platanacez . 1 6 
Roxburghiacee . 3 8 Coriaries 1 3 
Flagellarieze 3 8 Moringese 1 3 
Datiscaceze 3 4 Columelliacez . 1 2 
Lennoacez 3 4  ‘Leitnerier . 1 2 
Empetracese . 3 4, Ceratophyllee . 1 2 
Philydracee . 3 4, Batidez . 1 1 
Calycanthaceze 2 . 4 —_ — 
Canellaces owe ee 4, Totals . 40 99 
Some of the foregoing orders are quite local, while others have a wider range, 
particulars of which are given in the fourth volume, pp. 171-205. There are six 
other orders of only one genus each, namely, the American Lacistemacee, com- 
prising sixteen described species, and the Australasian Stackhousiacee * of about 
twenty species; the widely spread Frankeniacee and Myricacee, and the Old-World 
Nepenthacez and Casuarines:: all rather numerous in species. 
As another illustration of the Flora of the World, a list of genera numbering 300 
species and upwards each is appended, together with their general distribution f. 
Genera. . Species. Distribution. 
Senecio . . . . - 900 Nearly all over the world. 
Solanum. . . . . 700 Generally dispersed in warm regions, rarer in temperate. 
Piper. . . . . . 600 Tropics, and extending to Japan and New Zealand. 
Euphorbia . . . . 600 Almost everywhere, except the coldest regions. 
Ficus. . . . ... 600 Universal in the tropics, rare in temperate regions. 
Astragalus . . . . 500 North temperate and cold regions; rare in the south, and wanting 
in South Africa and in Australasia. 
Eugenia. . . . . 500 Tropical and subtropical regions. 
Psychotria . . . . 500 All over the tropics. 
Croton . . . . . 500 Tropics and extratropical America. 
Carex. . . . ~ . 500 In nearly all temperate and cold regions. 
Phyllanthus . 450 Very widely dispersed in warm regions, rare in temperate. 
Salvia. . . . . +. 450 North temperate and subtropical regions, rare in the south, except 
the Andes and South Africa. 
* The somewhat anomalous monotypic Australian genus Macgregoria, Muell., is referred to this order, a fact 
overlooked in the general table, vol. iv. p. 177. 
+ See Bentham in ‘Gardener’s Chronicle,’ n. s. xix, p. 371. 
b 2 
