CAEDTJUS. :201 



siialler. Heads very large; involucre covered with a dense 

 white weh. A remarkably conspicuous plant. — Waste ground 

 on a limestone soil. B. ViH. WooUy-headed Thistle. E. 



tt Leaves not spinous-hairy above, 

 a. I/imb of the cor. 5-pai-ted to ita base. Breea Less. 



6. C. arven'sis (Curt.) ; heads subdioecious, l. subsessik dbhng- 

 lanceolate pinnatitid spinous wavy, involucres ovate siibglabrous, 

 phi/U. hroadly lanceolate adpressed terminating in a short spread- 

 ing spine, rhizome creeping. — St. erect, 3—4 feet high, leafv, 

 angular, corymTjose above. L. very spinous, sessile or ver}- 

 slightly decurrent, varying gi-eatly in width. — t^- sefosm; I. 

 lanceolate flat entii-e or slightly lobed. C'l'r. setosum M. B. — 

 Fields and roads, fi. Culross and Kirkwall^ S. P. Ml. p. IX. 

 Cret^ng Thistle. E. S. I. 



b. Limb of the cor. 5-parted to its middle. 



1. C. paliis'tris (L.) ; I. decurreni lanceolate deeply piunatifld 

 spinous, involucres ovate crowded, phyU. mate-lanceolate ad- 

 pressed mucronate. — St. solitary, erect, 8 — '5' feet high, wand- 

 fike, with wavy spinose wings throughout, slightly branched. 

 Heads in a terniinai cluster, smaU. Fl. purple or white. Under- 

 side of the 1. usually cottouv. Involucre with a slight web.^ — 

 Wet meadows. A. \TL. Tin. E. S. I. 



8. C. praten 'sis (Huds.) ; /. mostly radical lanceolate wavy or 

 lobed pilose above cottony beneath fi^nged with minute prickles, 

 stem-l. not decun-mit few clasping; involucres globose solitary 

 terminal slightly cottony, phyll. lanceolate-attenuate adpressed 

 mucronate, rhizome creeping. — Cir. aiif/liciiiit Lam. — St. 1 — '2 

 feet high, cottony, usually quite siriiple and single-headed, leaf- 

 less in the upper half with a few scaly bracts, springing singly 

 from the rhizome. L. broad, soft, sinuate-dentate, rarely with 

 small 2 — 3-fid lobes, not pinnatifid, fringed with small but un- 

 equal prickles, lower 1. stalked. Occasionally there are 2 or 3 

 fl. on a stem- — C. Forsteri (Sm.) is a hybrid between this and 

 C. palustris, having L slightly decurrent lanceolate all pinnatifid 

 spinous cottony beneath, st. panicled, inv. ovate slightly cottony, 

 root csespitose producing several stems. — Boggy meadows. P. 



VI. xm. E. I. 



9. C. tuberdsus (L.); 1. lanceolate deeply pinnatifid pilose 

 above hairy or slightly cottony beneath fringed with minute 

 prickles, stem-l. sessile not decurrent, lobes 2 — S-fld, involucres 

 ovate terminal 1 — 3 together slightly cottony, phyll. lanceolate 

 mucronate adpressed, root of elliptic ta^ieringjleshy fibres. — Cir. 

 bidbosum DC, Koch. — St. i feet high, erect, round, hairv, leal- 



k5 



