OF THE HERBARIUM AMBOINENSE. 
319 
guided in the division by the taste of the fruit. I have, 
therefore, assembled here all those mentioned by Rumphius 
which have an acid fruit, and which therefore should come 
under one or other of the varieties of the Citrus medica. 
These, in fact, differ from the Malus medica, or first variety,, 
having a very thick spongy skin, while that of the Malus 
Limonia acida is thin, and more solid. 
In attempting to reduce the plants mentioned by Rum- 
phius to these two divisions, I cannot satisfy myself, and 
shall therefore content myself by making two observations. 
1. There is great reason to suspect that the reference to 
the plates by Burman, the editor, is in several cases erro- 
neous, the figures and descriptions by no means agreeing. 
I suspect, therefore, that tab. xxxvi. f. J, represents the 
Limo wiguentarius, f. % the Limo tuberosus, f. 3. the Limo 
Taurinus, table xxxvii. the Limo agrestis, and table xxxviii. 
the Limo ventricosus, while there is no figure of the Limo 
ferus. 
2. The LimoneUus angulosus, from the difference of 
habit, having stipulary thorns growing by pairs, in place of 
single axillary thorns, is certainly of a different species, first 
introduced into the system by Willdenow, as the Citrus 
angulosa (Sp. PL iii. 1426), a species adopted by Poiret 
(Enc. Meth. sup. iv. 171), and DecandoUe (Prodr. i. 540). 
I cannot rely much on the flowers in the figure being placed 
singly, and being of so small a size ; for the flowers of many 
of the other species in Rumphius are represented equally 
small, although I know them to be as large as usual in this 
genus, and several are represented in terminal racemes, al- 
though no such inflorescence is known among these plants. 
These circumstances, therefore, in the figure of the Limo- 
neUus angulosus, not being mentioned in the description, 
may be fairly imputed *^o the error of the draughtsman ; but 
the description of the fruit appears to point out that this 
