27. COMPOSIT.E. 



93 



1. Cirsium lanceolatum, Scop. Sprar Thistle 

 Erect Ineiinial, with spiny wings on the stem and branches; 

 stem-leaves deeply pinnatifid, spiny, decurrent, rough above 

 with small appressed prickles, and usually while-woolly 

 beneath. segments lanceolate, 

 spiny, the terminal one long, 

 the lateral ones bifid, with the 

 upper lobe turned outwards 

 and the lower lobe inwards ; 

 heads ovoid to globular; invo- 

 lucre woolly, the bracts linear- 

 lanceolate, spreading erect, end- 

 ing in a fine spine; akenes yellow, 

 with dark streaks; flowers purple. 

 Cardiius lanccolatits, L. 



Roadsides, gullies, waste 

 places : often erroneously called 

 "Scotch Thistle."' — Dec. -June. — 

 Europe; Avestern Asia. 



2. C. arvense, Scon. Creep- 

 in<i ThisfJr, Canada Thhflr . Erect 

 perennial, comparatively low, 

 with creeping rootstock ; stem- 

 leaves pinnatifid with spiny 

 edges, sometimes shortly de- 

 current, white-woolly below or 

 glabrous on both sides ; heads 



Cirsiurvt lanceolatum. 



Picnomon Acarna. 



small in a loose corymb ; 

 in\olucre ovoid or sub- 

 cylindrical, the outer and 

 middle bracts lanceolate, 

 erect, with very short pun- 

 gent points ; flowers dice- 

 cious, purple. 



A troublesome weed, but 

 rare. — Dec. - Feb. — Eiirope, 

 Asia. 



19. Picnomon, Cassini. 



(Greek pyhnos, dense, and 



koine, hair; alluding to 



the den.se pappus.) 



Character of Cirshim, 

 except that the involucral 

 bracts terminate in a 

 pinnate-spinulo.se .spine. 



1. Picnomon Acar- 

 na, Cass. Stout, erect, 

 white - woolly annual, 



branching from near the 

 base ; leaves oblong-lanceo- 



