SYNGENESIA.— SUPERFLUA. 299 



serrate, scabrous, petiolate ; petioles naked ; stem 

 mnch branched, smooth ; branches hairy ; calyx 

 loose, subimbricate. 

 HAB. Fields and woods. Sept. If:. Stem 2— S 

 ft. high; fl. pale blue. Near A. undulatus. 



47. A. cordifolius : leaves cordate, hairy beneatb, 

 acutely serrate, petiolate ; petioles winged ; stem 

 paniculate, smoothish ; panicle divaricate ; calyx 

 loose, subimbricate. 



HAB. Rocky woods. Sept. U. Stem2ft. high; 

 jl. rather small, pale blue. 



48. A. corymbosus : leaves ovate, acutely serrate, acu- 

 minate, smoothish ; inferior ones cordate, petio- 

 late ; petioles naked ; stem smooth, corymbose- 

 fastigiate above ; branches hairy ; calyx oblong, 

 imbricate; scales obtuse, closely appressed. 



HAB. Dry woods. July — Aug. U . Stein 2 ft. 

 high ; Jl. middle-sized, wh. 



49. A. macrophyllus : leaves ovate, petiolate, serrate, 

 scabrous; upper ones ovate-cordate, sessile ; infe- 

 rior cordate, petiolate ; petioles somewhat mar- 

 gined ; stem branched, diffuse ; calyx cylindrical, 

 closely imbricate ; scales oblong, ?cute. 



HAB. Woods. Aug. U- Stem 2 ft. high ; Jl. 

 pretty large, wh. or pale bl. 



* * * Pappus double ; flowers mostly corymbed. 



50. A. linariifolius : leaves linear, mucronatc, thick, 

 without nerves or punctures, carinate, scabrous. 

 rigid ; those of the branches recurved ; stem sub- 

 decumbent ; branches fastigiate, elongated, 1- 

 llowered ; calyx imbricate, as long as the disk. 



HAB. Dry fields, and on rocks. Sept. — Oct. A 

 foot high; jl. violet. 



51. A. rigidus : leaves linear, mucronate, subrarinate, 



rigid ; margin scabrous-ciliate ; stem-leaves re- 

 flexed, of the branches spreading, subulate ; stem 

 erect, somewhat branched above; branches 1- 

 flowered, corymbed; calyx imbricate, half the 

 length of th<> disk; scales carinate, rather obtuse j 

 rays .about 10- flowered, reflexed. 



HAB. Sandy fields. Sept. U. A foot hi- I 

 middle-sized, violet. 



