340 



THE KINDS OF PLANTS 



17. ERfGERON. Fleabane. 



Annual, biennial or perennial erect herbs, with simple, sessile leaves: 

 heads few- to many-flowered: rays numerous in several rows and pistillate: 

 scales of involucre narrow and equal, scarcely overlapping, not green-tipped : 

 torus flat or convex, naked : pappus of soft bristles. 

 a. Mays very inconspicuous. 

 E. Canadensis, Linn. Horse-weed. Hare's -tail. Fig. 500. 

 Tall, erect, weedy, hairy annual, with strong scent : leaves 

 linear and mostly entire or the root-leaves lobed: heads small 

 and very numerous in a long panicle, the rays very short, 

 aa. Hays prominent ; common fleabanes. 

 E. annuus, Pers. Usually annual, 3-5 ft., with spreading 

 hairs: leaves coarsely and sharply toothed, the lowest ovate 

 and tapering into a margined petiole: rays numerous, white or 

 tinged with purple, not twice the length of the involucre. 



E. strigosus, Muhl. Usually annual, with oppressed hairs 

 or none: leaves usually entire and narrower: rays white and 

 numerous, twice the length of the involucre. 

 18. CALLlSTEPHUS. China Aster. 



Erect, leafy annuals, with large solitary heads bearing nu- 

 merous white, rose or purple rays : scales in several rows or 

 series, usually leafy: torus flat or nearly so, naked: pappus of 

 long and very short bristles. 

 C. hortensis, Cass. Common China aster, now one of the commonest of 

 garden annuals, in many forms : leaves sessile and coarsely toothed. China. 



19. EUPATORIUM. Boneset. 



Erect perennials, with simple leaves: heads small and rayless, clustered, 

 all the florets perfect : scales not leafy : torus flat or low-conical, naked : 

 akene 5-angled: pappus a single row of soft bristles. Low grounds. 



E. purpureum, Linn. Joe Pye weed. Tall, with purplish stem and lan- 

 ceolate toothed leaves in whorls of 3-6 : heads flesh-colored, in dense 

 corymbs. Swamps, growing 3-10 ft. 



E. perforatum, Linn. Boneset. TJwronahwort. Fig. 159. Two to 4 

 ft., hairy: leaves opposite and sessile, lanceolate, flowers white, in clusters. 



500. Erigeron 

 Canadensis. 



