248 SYNGEN. POLYGAM. FRUSTRAN. 



37. ACHILLEA. 



* Flowers white, or rarely reddish. 



1. A. Pfarmica (Sneeze -wort), leaves linear lanceolate acuminate 

 sharply serrated. Lighlf.p. 495. E. B. t. 757. 



HAD. Moist meadows and pastures, frequent. Fl. July, Aug. If. . 

 Stem 1 3 feet high, erect, terminating in a rather large corymb, 



whose disk, as well as ray,- is white. When dried and pulverized 



has been used to excite sneezing. 



2. MiUejotium (common Yarrow)) leaves bipinnate slightly hairy 

 their segments linear toothed acute, stems furrowed. LightJ. 

 p. 496. E. B. f.758. 



HAB. Pastures and way-sides, frequent. Fl. the summer through. I/ . 



Stem erect, about a foot high, terminating in a corymb of . oweis 

 which are smaller than those of the last species, white, or sometimes 

 tinged with rose colour. The quality of the plant is highly astrin- 

 gent, and the Highlanders are said to make an ointment of it which 

 dries and heals up wounds. 



** Flowers yellow. 



0. A. tomentosa (woolly Yarrow}, leaves hipinnatiful woolly the 

 segments crowded linear acute, corymbs repeatedly compound. 

 E~.B. t.2532. 



HAB. Dry hilly pastures exposed to the sun, rare. On Spittle Hill, 

 to the N. W. of Balvie, Dumbartonshire, and on the hills near 

 Paisley : discovered by Mr. Hugh Ross. Fl. Aug. ~lj. . 



A span or rather more in height. Readily recognised by its downy 

 leaves, and much branched corymbs of yellow flowers. 



3. POLYGAMIA FRUSTRANEA. 



(Cynarocephalce, Juss.) 

 38. CENTAUREA. 



1. C. Jacea (Irown Knapweed], scales of the involucre scari- 

 ose torn the lower ones pinnatifid, leaves linear lanceolate 

 the lower ones broader and toothed. E. B. t. 167$. 



HAB. Discovered in a young plantation in Newbigging Muir, near 

 Belmont castle, 1811, by Mr. Young. Seen near Newtyle, An- 

 gus-shire, by D. Don: but I doubt whether it may not be the same 

 station as the first. Invercarrity by Kinnordy, Kerriemuir, C. Ly- 

 ell, Esq. Fl. Aug., Sept, I/ . 



Lower leaves obovato -lanceolate, petiolate, toothed ; upper ones entire, 

 sessile. Scales of the involucre pale brown, shining ; the outer 

 ones deeply pinnatifid ; the inner or uppermost ones torn, in which 

 respect it differs greatly from C. nigra. Florets not very numerous, 

 spreading, purple. 



2. C. nigra (black Knapweed], scales of the involucre ovate 

 ciliated with capillary teeth, lower leaves angulato-lyrate, up- 

 per ones ovate. Ligklf. p. 498. E. B. /. 278, 



