ASTER. ERIGERON. 171 



roundish-cordate, angular, toothed, downy beneath. Moist 

 chalky and clay soils. P. III. IV. 



Tribe II. Asteroidea. 



Style of the hermaphrodite florets cylindrical with linear 

 branches which are flat and equally and minutely downy on the 

 outer surface and have narrow prominent stigmatic lines 

 throughout. 



Section 1. ERIGERINE^E. Heads never dioecious, mostly 

 radiant. Anth. without appendages. L. alternate. 



4. (7.) ASTER Linn. Starwort. 



1. A. Tripolium (L.) ; st. glabrous corymbose, 1. linear-lan- 

 ceolate fleshy smooth, involucre imbricate, phyll. obtuse mem- 

 branous the inner ones longer. E. B. 87. R> xvi. 907. Tripo- 

 lium vulgare DC. St. 1 2 feet high, erect, hollow, leafy, many- 

 flowered. Heads large with a yellow disk and bright blue rays ; 

 rays often wanting. Muddy salt marshes. P. VIII. IX. 



5. (8.) ERIGERON Linn. 



*1. E. canadensis (L.) ; st. much branched hairy panicled 

 many -flowered, 1. linear-lanceolate ciliated. E. B. 2019. St. 

 erect, 1 2 feet high. Heads many, small, yellowish. In- 

 volucres cylindrical, scarcely shorter than the florets of the ray, 

 finally spreading. Waste ground, rare. A. VIII. IX. E. 



2. E. acris (L.) ; st. corymbose, branches alternate l-headed, 

 1. linear-lanceolate entire spreading, lower 1. narrowed below, ray 

 erect scarcely longer than the disk, inner female florets filiform 

 many. E. B. 1158. R. xvi. 917. St. erect, 618 in. high, 

 simple below, corymbosely-branched above, often several from 

 one root. Fl. yellow, the ray pale blue. Dry gravelly places and 

 walls. B. VIL VIII. Fleabane. 



3. E. alpinus (L.) ; st. mostly with a single head, 1. lanceolate, 

 lower 1. narrowed below, ray spreading twice as long as the disk, 

 " inner female florets tubular-filiform numerous." E. B. 464. 

 JR. xvi. 914. St. 4 8 in. high, usually terminating in a solitary 

 head with a yellow disk and light purple ray. Involucre hairy. 

 j3. E. uniflorus (Sm. not L.) has a shorter and more erect ray 

 and a rather more hairy involucre. E. B. 2416. Highland 

 mountains. P. VII. VIII. S. 



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