The vegetable SYSTEM. 
41 
in Siberia. It flowers in July and Augufl:. The Leaves are of a 
flrong dark-green : the Stalk rifes to two Foot and a halfhigh, and 
is very branchy. The Flowers are of a pale yellow. 
I imagine this Plant to be the Pfora of Aetius ; he might naturally 
enough be acquainted with it ; and I have tried its virtues againfl: 
cutaneous eruptions this year, not without fome fuccefs. 
2. SIMPLE SCURF - WORT. 
Plate 27. Fig. 2. 
Charafter of the Species. Centaurea Stoebe. 
The Leaves are linear, and limply pinnatifid. 
Fig 2. a h. 
This is a Biennial, native of Germany, and flowers in Auguft; an 
upright but very inconfiderable Plant. The Leaves are of a fomewhat 
bluehh green. The Flowers are crimfon. 
3. HUMBLE SCURF-WORT. 
Plate 27. Fig. 3. 
Charader of the Species. Centaurea Acaulis, 
The Leaves are harped, and the Flower refts almoft upon 
the ground. 
Fig. 3. a b. 
This is a Biennial, native of Arabia, and flowers in June. The 
Leaves are ragged and of a blueifh green. The Stalk is fcarce an 
Inch high, fo that the Flower feems to reft upon the ground without 
^ny. It is large, and of a delicate yellow. 
GENUS III. 
CREST-WORT. 
COLYMBADA. 
Charader of the Genus. 
The Hairs of the Scales (land diftant, are fharp, and rife 
VoL. III. M upon 
