28o 



COMPOSITE 



8 — 12 in. high, downy; leaves oBlong-lanceolate, toothed, 

 cottony beneath ; heads 2 — 3 in. across, in a dense terminal 

 corymb ; involucre ovoid, woolly ; -florets light purple, scented like 

 Heliotrope. — Alpine mountains ; rare.— Fl. August. Perennial. 



7,7^. Serratula 

 (Saw - wort). — Herbs 

 with simple, sometimes 

 pinnatifid, serrate leaves, 

 and generally dioecious 

 heads^ with imbricate, 

 not spinous bracts, a 

 scaly receptacle, florets 

 all tubular, crimson or 

 white, anthers nearly, or 

 quite, without tails, and 

 a pappus of several 

 rows of unequal stiff 

 hairs, the inner longest. 

 (Name from the Latin, 

 meaning saw - toothed, 

 with reference to the 

 leaves.) 



I. S. tinctoria (Com- 

 mon Saw-wort). — The 

 only British species, a 

 slender plant, i — 2 feet 

 high, with a stiff, erect, 

 angular stem, slightly 

 branched above ; leaves 

 deeply lyrately pin- 

 natifid and serrate ; 

 heads few, small, in a 

 loose corymb ; outer 

 bracts smooth, adpress- 

 ed ; inner tinged with 

 red ; florets crimson. — 

 Pastures ; frequent. — 

 Fl. August. Perennial. 



34. Centaurea (Knapweed). — Wiry herbs with leaves some- 

 times spinous ; heads egg-shaped or globose ; bracts imbricate, 

 adpressed, membranous, or sometimes spinous, or fringed ; 

 receptacle flat, bristly; florets all tubular, but the outer usually 

 large, unsymmetrical, and neuter. (Name from the Centaur 



serrAtula tinctoria {Common Saw-wo7't). 



