164 KEY AND FLOKA 



Tribe 9. Cynaroi'de.e. Anthers either with tails or arrow- 

 shaped. Style branches without tips or appendages, often 

 united at the apex. Corollas all tubular, with long, narrow, 

 linear divisions. Eeceptacle densely bristly. 



Suborder I. — LIGULIFLO'R^ 



All the flowers ray flowers. Herbs with milky juice. The 

 flowers are generally closed in the afternoon. 



I. CICHO'RIUM, Chicory 



Perennial herbs with long, spreading branches. Leaves 

 radical and alternate, toothed or pinnatifid. Heads an inch 

 or more m diameter, bright blue, in the axils of the leaves. 

 Bracts of the involucre in 2 series, firmly enclosing the ripe 

 akenes. Fapjjus 1 or 2 series of short, obtuse scales. 



C. In'tybus L. This is very beautiful in the summer and fall. 

 The stems become garlands of bright blue flowers. It has escaped 

 from cultivation. 



II. HYPOCH^'RIS, Cat's Ear 



Annual or perennial herbs, with the leaves all radical, and 

 forming a rosette at the base of the stem. Stems 7iaked, 

 branching, terminated by heads of yelloiv flowers. Bracts of 

 the involucre in rows ; receptacle with chaffy scales that 

 fall soon. Pajypus consisting of 1 row of feathery hairs and 

 an outer row of short, stiff bristles. The two species are 

 introduced. 



a. H. gla'bra L. Annual. Stems several, slender, erect. Heads 

 rather small, with the involucres as long as the flowers. Widely 

 distributed. 



h. H. radica'ta L. Perennial. Stems many. Heads much larger, 

 the involucres shorter than the flowers. Not quite so common as 

 the preceding. 



m. TRAGOPO'GON, Oyster Plant, Salsafy 



Smooth herbs from fleshy tap-roots. Leaves thin, lax, 

 sessile, tapering to a long point. Heads large, with purple 



