102 Mr. Brown's Ohervntiom on the 



Sir James Smith has ah'eady pointed out the error M. de Jus- 

 sieu has been led into in referring Hippia mimita Linn, to liis 

 Gymuostyles nasturtiifolia, a plant much more nearly related to 

 Hippia stolonif era of Brotero ; which, from repeated examination, 

 I can with confidence refer to the same genus. 



Gymnostyles anthemifoUa is stated by M. de Jussieu to be a 

 native of New South Wales : but as I have observed it only in 

 cultivated ground in the neighbourhood of Sydney, and as it has 

 certainly been found in South America, of which four other species 

 of the genus are unquestionably natives, it has probably been im- 

 ported into New South Wales, perhaps from Brazil ; nor is it al- 

 together improbable that Hippia stolonifera of Brotero may have 

 been introduced into Portugal from the same quarter. 



Grindelia, 

 described by Willdenow in the Transactions of the Natural 

 History Society of Berlin for 1807, and subsequently in his Enu- 

 meratio Plantarum Horti Berolinensis, flowered in Kew Gardens 

 for the first time in 1815, when I had an opportunity of examining 

 it, and of determining its very near affinity with Donia, a genus 

 proposed in the second edition of Hortus Kewensis, and adopted 

 by Mr. Pursh in his Floraof North America: the principal distinc- 

 tion between these two genera consisting in a difference in the 

 number of radii of the pappus, which in Grindelia is described by 

 "Willdenow as of two rays, and according to my observations has 

 more frequently one only. But as even in Donia the number of 

 rays, though indefinite, is variable, and the structure of the pap- 

 pus is very nearly similar in both genera, which in all other re- 

 spects agree, it may be perhaps expedient to unite them under 

 the name of Grindelia, which was first in order of publication. 



Tridax 



