COMPOSITiE. 210 BIDKNS. 



few remote serratures. The seeds (achenia) are half an inch long and 

 crowned with 2 stout, hispid awns. July — Aug. Bien. Tick-seed Sunfloicer. 



2. C. Ro'&EA. mnt. 



S/e7« branched ; /eares opposite ] -nerved, linear, entire; fcdunclcs short; 

 outer scales very short; rays obscurely tridentate. A very delicate speck-sin 

 wet grounds, Ms., rare. Stem about afoot iiigh, clothed with numerous, 

 very narrow leaves, and bearing a few small heads. Rays rose-color, varying 

 to white. Disk light yellow. July — Aug. Per. Rose-red Tick-seed. 



3. C. TINCTO'RIA. — Radical leaves sub-bipinnate, leaflets oval, entire, 

 smooth; c«w//nc ones subpinnate, leaflets linear; r«^/s 2-colored ; .s-cf(/5 naked. 

 This species, with ns.is a handsome border annual, native of Missouri. Stem 

 ] — 3 feet high, with light, smooth foliage. Flowers with yellow rays beauti- 

 fully colored with purple at their base. Flowering all summer. Another 

 species, C. Drummimdti, is also a popular border flower, blossoming all 

 summer. Plant a foot or more high, with yellow flowers. Of this there is 

 a new variety, ntrosunguinca, with dark-orange flowers. All these species 

 and varieties are raised from seed in a light rich soil. 



37. BIDENS. 

 Involucre nearly equal, doul)le, scaly or leafy at the base; 

 rays iew^ neutral; disk perfect; receptacle chatTy, flat; 

 pappus of 2--4 awns, rough backwards. 



Lat. hidens, two toothed ; the seeds have two (or more) barbed teeth. 

 Leaves opposite. Involucre scales parallel, concave or channelled on the 

 back. Rays often wanting. Achenia quadrangular, 



1. B. ce'rnua. 



Fhu'crs subradiate. cernuous ; outer involucre as long as the flower ; leaves 

 lanceolate, subconnate, dentate. In swamps and ditches. Stem 1 — 2 feet 

 hiirh, purplisii, branched, round at base, striate above, branches opposite, 

 leaves opposite, somt'what connated at base. Flowers yellowish green, final!}' 

 drooping, generally with yellow rays about 8 in number. Aug — Oct. 



It'ater Burr-Marigold- 



2. B. chrysantiiemoi'des. 



Flowers radiate ; rai/s three times as long as the nearly equal involucre ; 

 haves oblong, attenuate at each end, connate at base, dentate. A low plant 

 with large yellow-rayed flowers, in muddy places. Stem (1 — 20 inches high, 

 round and smooth. Leaves smooth, v.-ilh lew remote teeth, narrow, opposite, 

 with narrow connate bases. Flowers commonly erect, rays about 8, large, 

 spreading. Scarcely distinct from i^. fc;7i!ia. Sept. Oct. Ann. 



Radiate Burr-Marigold 



3. B. FRONDO'SA. 



Flmccrs discoid ; outer involucre G times as long as the flower, its leaflets 

 ciliate at base ; lou-er leaves pinnate; upper ones teinate, lanceolate, serrate. 

 A common weed in moist, cultivated fields, often called beggar-ticks, from 

 the 2-horned achenia wliich adhere to every one who passes by it. Stem 2 

 feet hinh, sending out many spreading branches. Lower leaves in Ms or os. 

 Flowers in clusters at the end of the branches, witliout rays, yellow, surrounded 

 by a large and leafy involucre. Aug. Sept. Ann. Leafy Burr-Marigold. 



