ae 
under which the genera are classified. For the purposes of this 
book it has been, in many cases, convenient to ignore the Natural 
Orders, and go direct to the genera, but some of the larger and 
more well-marked Orders are analysed separately, so as to relieve 
the General Key, and the Keys to these are arranged alphabetically, 
beginning at page 33. 
After a little practice the student will learn to recognize 
at a glance the plants belonging to such Natural Orders as 
CRUCIFERA, UMBELLIFERA, COMPOSITA, 
LABIATA, ORCHIDACESA, etc., or to several of the 
larger genera, and will be able to turn to these at once, without 
the labour of going through the General Key first. 
For the convenience of those who use Jouns and Extiott’s 
“Flowers of the Field,” a list is given below of the few plants 
described in that work under a different name from that used in 
BenTuHAm’s “ British Flora,” and in the present book. Ina few 
other instances (mostly confined to the first half-dozen Natural 
Orders), plants are described by them as species which Bentham 
only recognizes as varieties. 
(BENTHAM AND HOOKER). (JOHNS AND ELLioTT). 
Pzeonia officinalis. P. corallina. 
Rosa pimpinellifolia. R. spinosissima. 
Rosa villosa. R. tomentosa. 
Ludwigia palustris. Isnardia palustris. 
Apium nodiflorum. Helosciadum nodiflorum. 
Apium inundatum. Helosciadum inundatum. 
Carum segetum. Petroselinum segetum. 
Carum Petroselinum. Petroselinum sativum. 
Caucalis Anthriscus. Torilis Anthriscus. 
Caucalis arvensis. Torilis infesta. 
Caucalis nodosa. Torilis nodosa. 
Valerianella. Fedia. 
Leontodon. Apargia. 
Taraxacum Dens-leonis. Leontodon Taraxacum. 
Carduus (part of). Cnicus. 
Aster Linosyris. Chrysocoma Linosyris. 
Tussilago Petasites. Petasites vulgaris. 
Limnanthemum nympheoides. Villarsia nympheoides. 
Chenopodium Vulvaria. Chenopodium olidum. 
Habenaria conopsia. Gymnadenia conopsia. 
