34 SPRING 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 pinnatifld. Achenes beaked 



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

 common. 



65. COMPOSITAE. 

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

 row of corollas, tubular and o-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 Hi/menopappus 



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 pinnatifld. . .Chrysanthemum 

 Annual; heads few; leaves mostlv entire Erigeron 



ERIGEKON, L. 



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

 bristles. 



E. ramosus, (Walt.) B. S. P. Leaves narrow, sessile, entire or the 

 lower toothed. Reads few in a loose corymb. Stem erect, about i m. 

 Fields and prairie, common. 



AXTEXXARIA, Gsertn. 



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

 Woolly perennials. 



A. plantagini 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. 



HYMEXOPAPPUS, L'Her. 



Bracts broad and thin, the upper part somewhat colored. Pappus a 

 row of thin scales. Leaves alternate. Heads several in a loise corymb. 



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

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

 common. 



DYSODIA. Cav. 



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

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

 with yellow glands giving off a strong odor. 



