226 SYNGEN. POLYGAM. ^ClUAL. 



3. POLYGAMIA FRUSTRANEA. 



{Cynaroceplialce, Juss.) 



38. Centaurea. Lwolucre acaly. Receptadehr\st\y. Corollas 

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

 disk. Pappus simple. 



1. POLYGAMIA ^QUALIS. 



* Semiflosculosi. 

 ]. TRAGOPOGON. 



1. Tr. pratensis [yelluiv Goat's-leard), involucre about as long 

 as the cm*., leaves undivided glabrous acuminated channelled, 

 peduncles cylindrical. Lightf.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. $. 



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-leard), 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. 5/ . 



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

 tivated for culinary purposes, 



2. PICRIS. 

 1. P. hieracioides [Hawkweed Ox-toiigue), 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. F/. July, Aug. ^. 

 Stem 2 — 3 feet high. Flowers yellow, corymbose ; 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.2i25, 



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

 tains, rare, G. Don. Fl. July, Aug. % . 



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

 Peduncles, involucre and bracteas covered with reddish viscid bristles. 



2. S. arvensii {Corn Sow-thistle), peduncles and involucre his- 

 pid subumbellate, leaves runcinate dentato-ciliate cordate at 

 the base. Lightf.p. 427. E. B.t. 674. 



Hab. Corn-fields, frequent. Fl. July. 1/ . 

 Stems 3—4 feet high. Flotvers large, yellow. 



