202 COMPOSITE FAMILT. 



C. Drummdndii, of Texas, is low and spreading, rather hairy, with leaves 

 of 3 - 7 oval leaflets, or some of them simple, heads on long peduncles, and very 

 oroad rays golden yellow with small dark spot at base. 



« * ® Disk-fiawers yellow : rays yellow with a darker and purplish-streaked spot 

 near the base : akenes winged and 2-toothed. 



C. coron&ta, of Texas, is low, with slender-f etioled leaves oblong or Bpatu- 

 late, or some of them 3 - 5-pai-ted, and very long peduncle ; rays broad and 

 handsome. 



* « * ^ Disk-flowers and rays (V long) entirely yellow; akenes orbicular, much 

 incurved and broadly winged when ripe, erovmed with 2 little teeth or scales. 



C. lanceol&ta. Wild W. & S., and cult, in gardens ; 1° - 2° high, smooth 

 or sometimes downy, in tufts, with lanceolate or oblanceolate entire leaves 

 mostly crowded at the base, and long slender peduncles : flowers in early 

 summer. 



C. auricul^ta. Wild W. & S., and in some gardens ; taller, sometimes 

 with runners or suckers at base, leafy to near the top ; upper leaves oblong, 

 lower roundish and sometimes auricled at base or with 3-5 lobes or leaflets. 



§ 2. Bays entire or nearly so, oblong or lanceolate : akenes oblong, with a very 

 narrow wing or border, not incurved, and obscurely if at all 2-toothed at the 

 apex : scales of outer involucre narrow and entire : heads rather small, tlie 

 flowers all ydhw. "ij. 



* Low, 10-3° high, leafy to the top: leaves really opposite and sessile, but divided 



into 3 leaflets, thus seeming to be 6 in a whorl. Wild chiefly in S. States, 

 all but theflrst are cult, in gardens. 

 C. senifolia, has seemingly 6 lance-ovate and entire leaflets in a whorl, 

 'i c. two, but each 3-divided) smooth or downy. 



C. verticill^ta, has the pair cut into once or twice pinnate almost thread- 

 shaped divisions, smooth. 

 C. delphinifblia, very like the last, but with fewer lance-linear divisions. 



» * Tall, leafy to the top, with evidently opposite petioled leaves. 



C. tripteris. Rich ground W. & S., with simple stems 4° -9° high, leaves 

 of 3 - .5 lanceolate entire leaflets, corymbed heads, very short outer involucre, 

 and blunt rays. 



§ 3. Hays oval or oblong, golden ydlow, slightly notched : akenes wingless, not in- 

 curved, bearing 2 awns or teeth for a pappus : outer involucre conspicuous 

 and resembling leaves : branching plants of wet grounds, with thin leaves 

 mostly of 3-1 pinnate toothed or cut veiny leaflets ; resembling the next 

 genus, but the awns not downwardly barbed. (T) ® 



C. trichosp^rma. Swamps mostly near the coast, 1°- 2° high, with 3-7 

 lanceolate or linear cut-toothed leaflets or divisions, numerous heads, and nar- 

 row-oblong or linear wedge-shaped marginless akenes with 2 stout teeth. 



C. a^ea, only S., has upper leaves often simple, lower nearly as in the fore- 

 going, and shorter wedge-obovate akenes with 2 or 4 short chafF-like teeth. 



C. aristbsa, from Illinois S., has more compound leaves with oblong or 

 lanceolate often pinnatifid leaflets, and broad-obovate very flat akenes slightly 

 margined and bristly ciliate, the pappus of 2 long and slender awns, or some- 

 times 3 or 4, or in one variety none at all. 



53. BIDENS, BUE^MARIGOLD, BEGGAR-TICKS. (Latin for two- 

 toothed, from ilje usually 2 awns of the pappus.) Our species ® or ® ; 

 fl. summer and autumn. The akenes adhering to the dress or to the fleece 

 of animals by their barbed awns. 



§ 1 . Akenes broad and flat, with bristly ciliate margins. 

 » Coarse and very homely weeds, commonly without any rays. 

 B. frondbsa. Common Beggak-tioks. Coarse weed in low or manured 

 grounds, 2° - 6° high, branched, with pinnate leaves of 3 - 5 broad lanceolate 



