OF ARTS AND SCIENCES. 207 



behind Santa Cruz (also farther north), in which the lobes of the 

 corolla are shorter than in Dr. Lyall's specimens. 



Tetradyjiia DC. The style-branches of this well-marked genus 

 seem never to be exactly " truncate and peuicillate," but rather as fig- 

 ured in Delessert's Icones, with more or less of a conical tip, the base 

 of the cone with some penicillation : occasionally the cone in T. ca^ 

 nescens is more prominent, acute, and beset with a few stiff bristles. 

 This is observed in some of the numerous specimens which have 

 wholly glabrous ovaries. As the villosity of the akenes is not of 

 generic or even of specific value, and the style-branches are somewhat 

 variable, I am the more disposed to append to Tetradymia a plant of 

 peculiar aspect, with twice as many flowei'S in the head as occur in 

 T. spinosa, and with the involucre multibracteolate, so as to appear 

 much imbricated. The acutish style-branches are pecidiar (but not 

 quite Asteroid) : otherwise the flowers wholly accord with Tetradymia. 

 The plant in view is 



T. (Lepidosparton) squamata. Linosyris sqiuanata Gray, Proc. 

 Am. Acad. 8, p. 290. CarphepJwrus junceus Durand, in Pacif R. R. 

 Expl. 5, p. 8, non Benth. 



Raillardella. I willingly adopt from Mr. Bentham the entire 

 separation from Raillardia of these two interesting Californian species, 

 R. argentea and R. scaposa. The scales of the involucre appear to be 

 strictly in one series, and their edges are lightly united to the middle, 

 although at length separating or separable. From the size, rigidity, 

 and slight flattening of the bristles of the pappus, I still incline to refer 

 Raillardia and Raillardella to the Helenioidece ; and Dubautia, al- 

 though with paleaceous receptacle, is a manifest ally. 



Arctium Linn. Without raising any general question as to the 

 recognition of Tournefortian genera when superseded by Linnasus, and 

 where the Linntean name has continued to prevail, I do not well see 

 the necessity of reviving at the present day the Linntean name Arctium 

 (which included a Thistle as well as the Burdocks), after it has given 

 way to Lappa Tourn., all the way from Jussieu down to De Candolle 

 and Fries. 



Cnicus Linn. For the reasons assigned by Mr. Bentham, and 

 especially because he has done so in the new Genera Plantarum, it is 

 best to adopt for the present genus this Linnaean rather than the Tour- 

 nefortian name Cirsium. A revision of the North American species 

 will be attempted in a separate article. 



MiCROSERis Don. It is unfortunate, but inevitable, that this name 

 should supersede the happier one of Calais DC, under which most of 



