8 
into natural groups, marked by any positive character. For this 
reason it will be found that the order followed in the subjoined 
Synopsis does not precisely correspond with that of the Enumeration 
in the Botanical Register. 
The three first genera of the tribe, Pterostigma, Lindenbergia, 
and Stemodia, are so intimately connected together by the remark- 
able disjunction of the cells of the anthers and filiform adnate con- 
nectivum that I had (Bot. Reg. ad calc. n. 1470.) considered them 
as sections of Stemodia, but a difference in habit, connected with 
the form of the calyx, may warrant their separation, although the 
Pterostigma capitatum is in some measure a connecting species. 
Dodartia stands alone in habit, although the flower be so very 
nearly that of Mazus, a totally different looking plant. 
Mazus and Limnophila are also readily distinguished by their 
habit. The former has an unilateral inflorescence, approaching to 
that of Hydrophylleae. Limnophila appears to have the leaves of 
the lower part of the plant (usually immersed in water) always 
multifid and capillary, like those of Ranunculus aquatilis. This 
also takes place in Zuccarini’s Hydrotriche, which he describes as 
diandrous. In other respects this genus appears scarcely to differ 
from Limnophila. Its place, however, must remain doubtful until 
the fruit shall have been observed. 
Capraria, which I have placed here with doubt, until I have 
had an opportunity of seeing the flower in a fresh state, should 
probably be confined to C. bijiora, of which Ruiz et Pavon’s 
Xuaresia is (as Mr. Don informs me) a mere synonym. If it be 
removed from Gratioleaj it w'ould find its place next to Buddlea. 
The C. saxifragcefoUuy Cham, et Schlecht. has been established as 
a genus under the name of Pogostoma by Schrader (Linnsea 8, 
Litt. Ber. 24.) but I am unacquainted with the plant. 
Morgania and Uvedalia are unknown to me, but are perfectly 
characterized in Brown’s Prodromus. 
Mimulus is a very natural genus, distinguished by its calyx from 
all except Uvedalia and Torenia, and from the latter, of which 
it has sometimes the habit, by its capsule and stamina. 
Herpestis is readily known by the calyx, and comprises now a 
considerable number of species, chiefly from the tropical regions of 
both hemispheres. Martins (Nov. Gen. et Spec. 3. 16.) gives to 
the great mass of species Lamarck’s name of Bramia, and reserves 
the name of Herpestis to the single H. lanigera, characterized by a 
curious process arising from the disk, and surrounding the ovarium. 
Not having seen the plant, I have had noo pportunity (notwithstanding 
the great reliance I should place on Dr. Martins’s judgment) of form- 
ing any opinion for myself on this character ; but it w’ould appear 
that, if this be really agood genus, it would yet be advisable to retain 
