x PREFACE. 
HOoKERr’s Genera Plantarum. This work was not available 
to Professor Harvey when he commenced the Flora Capensis, 
and he appears to have based himself on the Prodromus of 
AvuGuSTIN PyraMusS DE CANDOLLE, in the three volumes of 
which he was the author with Dr. SonpERx. From Volume IV! 
onwards of the continuation the Genera Plantarum has been 
followed. ‘There is in consequence an inconsistency between 
the earlier and later portions of the work in. regard to the 
delimitation of the sub-classes adopted, which, although of 
little practical importance inasmuch as it scarcely affects the 
Sequence of the orders, it is desirable to clear up. How this 
arises will be apparent from the statement with which Professor 
HaRvEY commences the preface to his third volume: “This 
-++. contains the orders of CaLycirLor& with a monopetalous 
corolla and an inferior ovary. The fourth volume ... .iwill, it 
‘is hoped, include the Heaths (Hricee) and all the Monopetala 
with superior ovaries, i.¢., the COROLLIFLORA proper.” BENTHAM 
and Hooker in the Genera Plantarum have adopted the sub- 
class GAMOPETALa from Endlicher, who had established it in 
1836 to include all orders with a monopetalous corolla... This 
arrangement has been followed in the present work from 
Volume IV. onwards. The removal of monopetalous orders 
from Calyciflore does not however affect the sequence in which 
they are dealt with. But in order to make the classification 
consistent throughout, it is necessary in the first place to 
substitute the following new definitions of sub-classes 1-3 for 
those given by Professor Harvey in. Vol. L, p. xxxiii. | 
Sub-class I.) Tuaramirtora, Ord. L-XEL (Vol. L, pp. 1+ 
— 449). Calyx and . Corolla (generally) present. Petals 
‘Separate, inserted, as are also the stamens, on the receptacle 
- (Le., hypogynous). Ovary free. | ny stow 
Sub-class II. Canycrrnorz. Ord. “XLIL-LXX. (Vol. 1, 
pp. 450-528; Vol. IL, pp. 1-572). Calyx and Corolla 
generally) present. Petals Separate. Stamens inserted 
on the calyx | (perigynous): or- on ‘the ovary. (epigynous). 
_ Ovary free or moré or less adnate) to. the calyx-tube. 
LXXI. Balanophorew Nol.) U5 p. 572), and LXXIL 
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