34 SmtlNG FLORA OF MANHATTAN. 



N. cuspidata, (Pursh) Greene. Achenes beakless. Prairie, frequent. 



TARAXACUM, Hall. 

 Differs from Nothocalais in having two distinct series of involucral 

 bracts, the outer of short scales. Leaves piunatifid. Achenes beaked 



T. Taraxacum, Karst. Outer involucre reflexed. Waste plaoes, not 

 common. 



65. COMPOSITAE. 

 Differs from the previous order in having all or all except the outer 

 row of corollas, tubular and 5-lobed. The outer row of flowers are often 

 provided with strap-shaped corollas and are then called ray flowers, the 

 central portion of the head being called the disk. Ours all herbs. Leaves 

 opposite or alternate. 

 Ray flowers none. 



Leaves entire; heads dioecious Antennaria 



Leaves dissected; flowers perfect Hymeno2}appus 



Rays present, but sometimes quite small. 

 Yellow. 



Leaves alternate Senecio 



Leaves opposite Dysodia 



White or nearly so. 



Rays only 4-5; heads numerous in a corymb Achillea 



Rays numerous; heads few or single. 



Perennial; head solitary; leaves pinnatiM. . .Clirysanthemum 

 Annual; heads few; leaves mostlv entire Erigeron 



ERIGERON, L. 



Bracts narrow, equal, and in about one row. Pappus of capillary 

 bristles. 



jB. ramosn.s, (Walt.) B. S. P. Leaves narrow, sessile, entire or the 

 lower toothed. Heads few in a loose corymb. Stem erect, about i ra. 

 Fields and prairie, common. 



ANTENNARIA, Gjertn. 



Bracts dry and papery, imbricated. Pappus of capillary bristles. 

 Woolly perennials. 



A. pit tntagini folia, (L ) Richards. Lo.v and spreading. Radical 

 leaves obovate; those of the scape-like flower stems small and scale-like. 

 Prairie, common in early spring. 



HYMENOPAPPUS, L'Her.' 



Bracts broad and thin, the upper part somewhat coloi'ed. Pappus a 

 row of thin scales. Leaves alLeraate. Heads several in a loose corymb. 



H. cnryrnboms, Torr. and Gray Erect, about i m. high, woolly but 

 becoming glabrous. Upper part of stem leafless Rocky bluffs, not 

 common. 



DYSODIA, Cav. 



Bracts in one row, united into a cup, some loose ones at base. Pappus 

 a row of chatty scales, dissected into bristles. Conspicuously dotted 

 with yellow glands giving oft" a strong odor. 



