8 Prof. C. C. Babington on the British Species of Arctium. 



now before me is 12 inches long (exclusive of the lobes, which 

 add 2\ inches to the length) ; its width at the insertion of the 

 petiole is also fully 12 inches, and it narrows gradually and 

 uniformly from thence to near the tip, when it suddenly con- 

 tracts to a blunt end. It is therefore much broader in propor- 

 tion to its length than the leaves of those plants. As already 

 stated, its petiole is always solid. The hollow petioles of the 

 others have the woody fibres collected towards the circumference, 

 there being none even adjoining the tubular central space, which 

 is bounded by cellular tissue, although well defined in form and 

 apparently not a result of the mere rupture of that tissue. 



It only remains to define the species as I understand them. 

 The following table may be of use as pointing out the characters 

 by which they may usually be known. 



1. Upper division of the corolla inflated, rounded at the 



base, constricted below the teetb, glandular ; base of 

 the corolla much widened. Inflorescence corymbose. A. tomentosum. 

 Upper division of the corolla not inflated or rounded 

 at the base, bell-shaped or cylindrical, not constricted 

 or glandular ; base of the corolla not much widened 2. 



2. Inflorescence corymbose. Petioles solid A. majus. 



Inflorescence racemose. Petioles hollow 3. 



3. Radical leaves cordate-oblong. Heads subsessile A. nemorosum. 



Radical leaves cordate. Heads manifestly stalked 4. 



4. Inflorescence racemose. Heads all shortly stalked, 



small A. minus. 



Inflorescence racemose-pyramidal. Lower heads long- 

 stalked, uppermost subsessile A . intermedium. 



1 . A. tomentosum (Schkr.) ; inflorescentia corymbosa, capitulis pe- 

 dunculatis arachnoideis, squamis involucri floribus brevioribus, 

 parte superiore corolla glandulosa ad basin ventricosa sub denti- 

 bus constricta tubum ejus sequante, tubo corollse ad basin 

 fructus latitudinem subsequante, petiolis fistulosis, foliis radi- 

 calibus cordato-ovatis subintegris apiculato-dentatis. 



A. tomentosum, Schkr. Handb. iii. 49, t. 227 (1803) ; Pers. Syn. 



ii. 383 (1807). 

 A. Lappa, Ft. Dan. t. 642 ; Sven. Bot. t. 63. 

 A. Bardana, Willd. Sp. PL iii. 1632 (1800). 

 Lappa tomentosa, Lam. Fl. Fr. ed. 1. ii. 37 (1778) ; DC. Prod. vi. 



661 ; Rchb. Icon. Fl. Germ. xv. 80. 

 L. major ex omni parte minor capitulis parvis eleganter reticulatis, 



Dillen. in Rail Syn. ed. 3. 197. 

 Bardana capite araneoso. Cobweb-headed Burdock, Pet. Eng. PL 



t. 23. f. 6. 



Stem about 3 feet high ; top and each of the branches ending 

 in a well-formed corymb of heads. Heads rather small, spheri- 

 cal, umbilicate, very thickly webbed. Radical leaves rounded at 



