226 SYNGEN. POLYGAM. 



3. POLYGAMIA FRUSTRANEA. 



(Cynarocephalce, Juss.) 



38. CENTAUREA. Involucre scaly. Receptacle bristly. Corollas 

 of the ray infundibuliforin, irregular, longer than those of the 

 disk. Pappus simple. 



1. POLYGAMIA ^EQUALIS. 



'* Semifloscu losi . 

 } . TRAGOPOGON. 



1. Tr. pratensis (yelloiv Goat's-leard), involucre about as long 

 as the cor., leaves undivided glabrous acuminated channelled, 

 peduncles cylindrical. Ligktf.p. 420. E. B. t. 434. 



HAB. Meadows and pastures, Dr. Parsons. Banks of the Clyde, at 

 Clyde iron-works, Hopk. Daldowie, Glasg., Dr. Brown. Fl. 

 June. c?. 



One foot to two feet high. Flowers yellow, showy ; head of seed ves- 

 sels very large. Pappus very feathery, elevated on long stalks. 



2. Tr. porrifolius (purple Goat's -beard), involucre much longer 

 than the cor., leaves undivided straight, peduncle thickened 

 upwards. E. B. t. 638. 



HAB. Moist meadows about Glasg., very rare, Hopk. Fl. May, 

 June. #. 



Three to four feet high. Flowers purple. The root was formerly cul- 

 tivated for culinary purposes. 



2. PICRIS. 

 1. P. fiieracioides (Hawkweed Ox-tongue), exterior scales of the 



involucre short lax, leaves very rough lanceolate toothed, stem 



scabrous, pappus sessile. E. B.t. 196. 

 HAB. Road-sides and borders of fields, frequent. Fl. July, Aug. 

 Stem 2 3 feet high. Flowers yellow, corymbose j peduncles with 



foliaceous scales. The English P. echioides has very large outer 



scales or leaflets to the involucre. 



3. SONCHUS. 



1. S. cceruleus (Hue Sow-thistle], "peduncles and involucre his 

 pid racemose, leaves sublyrate, terminal lobe deltoid very large/ 

 Sm. E. B.t. 2425. 



HAB. Paps of Loch-na-gore, Aberdeenshire, and on the Clova moun- 

 tains, rare, G. Don. FL July, Aug. Jf. . 



Stem three feet high. Racemes long, of numerous blueish flowers 

 Peduncles, involucre and bracteas covered with reddish viscid bristles 



2. S. arvensis (Corn Sow-thistle), peduncles and involucre his- 

 pid subumbellate, leaves runcinate dentato-ciliate cordate at 

 the base. Light/. p. 427. E. B. t. 674. 



HAB. Corn-fields, frequent. JFY.July. I/. 

 Stems 3 4 feet high. Flowers large, yellow. 



