102 39; COMPOSITE. 



linear, entire, s^nrng -yolloV, : Arming ^spreading horizontal, 

 ray; outer ones leaf-like, pinnatifid or spinous on the border. Fl. 

 purplish; anth. yellow. 



Very rare. " Struey rocks, Arran," Lands. (E) B. 610. 



17. CENTAUKEA. Blue-Bottle, Star-Thistle. 



1. C. NIGRA, L. Knapweed, Hardheads.'*' Stem branched, 

 hard, 1 2 feet high. Lower le. with coarse teeth, upper entire 

 or nearly so, sessile, clasping the stem, rough with minute hairs. 

 Fl. -heads globose, very hard, on terminal peduncles. Scales of 

 the involucre closely imbricated, deeply fringed with black or 

 brown teeth. Florets purple, sometimes the outer row forming a 

 ray. Pappus short, deciduous. 



Very common. Pastures and banks. (B) P. 6 9. 



2. C. SCABIOSA, L. Greater Knapweed, Matfelon. Stem 

 branched, hard, 2 3 ft. high, stouter than the last. Le. deeply 

 pinnatifid, rough. Fl. -heads large, hard. Scales of the involucre 

 with a scarious margin and pale fringe. Florets purple, outer 

 ones enlarged and neuter. Pappus of stiff hairs nearly as long as 

 the achene. 



Very rare. Margins of fields. (B) P. 79. "Banks of the Calder, near the 

 bridge," HopJc. 



3. C. Cf ANUS, L. Corn Blue-Bottle, Corn-flower. Stem erect, 

 1 3 ft. high, slightly cottony. Le. lanceolate, nearly all entire ; 

 lower ones sometimes toothed, slightly cottony on the under side. 

 Fl. -heads solitary, on long ped. Scales of the involucre bordered 

 by a fringe of very small brown teeth. Florets of the centre 

 short, bluish purple, of the ray large and bright blue. Pappus as 

 long as the achene. 



Corn fields. Very rare around Glasgow. Often cultivated as a garden annual. 

 (B) A. 8. Possilroad; near Shettleston ; Cumbrae. 



TRIBE 3. CORYMBIFER^E. 

 18. BfDENS. Bur-Marigold. 



1. B. CERNUA, L. Nodding Bur-Marigold. Stem erect, 

 branched, 1 2 ft. high. Le. lanceolate, serrate. Bracteas longer 

 than the involucre. .Fl. -heads drooping. Florets generally tubu- 

 lar, brownish yellow. Fruit with 3 4 s ^ff bristles, rough with 

 reflexed prickles at the apex. 



Frequent. In ditches and lakes. (E) A. 7 10. Buttery-burn Loch; Erskine 

 and Kilpatrick ; St. Germans Loch; Hamilton, &c. 



2. B. TRIPARTITA, L. Trifid Bur- Marigold. Le. on the. 

 lower part of the stem, tripartite, sometimes cut into 5- segments. 

 Fl. -heads nearly erect, bristles 2 3. 



Not common. Marshy places. (E) A. 7 9. Cumbrae; Bute and Arran . 



