British and European Plants. 455 



nearly entire, slightly sagittate : in var. 5. all small, linear, nearly entire, 

 hardly sagittate ; involucrum oval when in bud, becoming afterwards ven- 

 tricose, equalling the pappus, its outer scales adpressed, few, small, short ; 

 flowers small, generally variegated with purple on the outside ; fruit ob- 

 long, not attenuated, ribbed, smooth, shorter than the pappus. 



The above-mentioned varieties are so completely connected by intermediate 

 forms that it is often quite impossible to determine to which of them a par- 

 ticular specimen ought to be referred ; but as they have been adopted as spe- 

 cies by some Continental authors, I have thought it right to define their most 

 marked forms. The specimen of C. virens in the Linnaean herbarium is of no 

 authority, being without the usual marks of authenticity. In the Smithian 

 herbarium is a specimen which belongs here, sent by Dr. Schrader as probably 

 the C. virens of Linnaeus, but referred by Sir J. E. Smith to C. tectorum. 



Very common on walls, banks, &c. ©. July, September. 



5. C. tectorum. Linn. 



Involucro pappum subaequante, foliis glabris sinuato-pinnatifidis : caulinis 



linearibus sagittatis margine revolutis, acheniis oblongo-attenuatis pappo 



sequalibus : costis scabris. 

 C. tectorum. Linu. Herh.; Sp. PI. ii. 1 135. Fl. Dan. 501. IFilld. Sp. PL iii. 



1601. DeCand. Fl. Fr. v. 448.; Bot. Gall. i. 300. Pers. Syn. ii. 376. 



tf^allr. Sell. Crif. i. 430. Lachmann, Fl. Brunsv. ii. 2. 184. Endlicher, Fl. 



Poson. 293. Gaud. Fl. Helv. v. 139. (excl. syn. Smith.) 



Very similar to the last, which has been mistaken for it by all British bo- 

 tanists (except Mr. Joseph Woods, to whom I am indebted for directing my 

 attention to their differences,) but it may be at once distinguished by attend- 

 ing to the structure of the fruit, which is very long, equalling the pappus, 

 attenuated above, its ribs rough ; the margin also of the upper leaves is re- 

 volute, that not being the case in C. virens. Wallroth refers C. Lachenaultii, 

 DeCand. Fl. Fr. v. 449. and Bot. Gall. i. 300. to this species, but being totally 

 unacquainted with that plant I cannot form an opinion upon the subject. The 

 specimens preserved in the Smithian herbarium under the name of C. tectorum, 

 all belong to C. virens, and are from Dauphiny and Switzerland. 



