Descriptive Flora 



229 



with bristle-like chaff. In low wet places. Summer and fall. 

 One of the most widely distributed plants, growing in all warmer 

 parts of the earth. 



Sclerooarpus uniserialis (Hook.) B. & H. 



Summer and fall blossoming plants with irregularly toothed 

 leaves and orange-yellow, composite flowers. Leaves simple, 

 opposite or alternate. Blades ovate to broadly lanceolate, 3- 

 veined at base, entire or with few blunt irregular teeth, acute, 

 y 2 to 2 inches long. Leaf -stalks as long as or shorter than the 

 blades. Flowers solitary, about 1 inch across, on long leaf- 

 less stalks. Rays 5 to 12, about y 2 inch long, nearly as 

 broad as long, abruptly constricted into a threadlike stalk at the 

 base, falling away early. Disk flowers long, not compact as in 

 the other composites, and further differing from all others in the 

 conspicuous green bract which envelopes each flower for over 

 half its length. Achenes or less long, smooth, sometimes with 

 a small crown at the top, and always inclosed in the green bract 

 which is about y£ long and envelops the disk flower. Summer 

 and fall. In thickets and along roadsides. 



Rubbeckia bicolor Nutt. Black-eyed Susan. Cone-flower. 



Rough, prickly-haired, stout-stemmed, erect plants with 

 large flowers that have dark brown, conical centers and velvety, 

 yellow or parti-colored yellow and brown rays. Leaves simple, 

 alternate. Blades lanceolate or oblong to oval-elliptc, % to 4" 

 long, hairy, entire or coarsely toothed, rough to the touch. 

 Flowers composite, over V/ 2 to 2%" across, with dark brown, 

 cone-shaped centers and 10 to 14 velvety ray flowers, clear yellow 

 or yellow with reddish-brown base. April, May and June. Wide- 

 spread, usually growing in patches along the road or in pastures. 

 Named for Rudbeck, a Swedish botanist. 



Ratibida columnaris (Sims.) D.Don. Nigger-head. "Gallitos" 

 (Lepachys oolamnaris Torr. & Gray.) 



Fibrous, much-branched weeds, 1 to 2y 2 feet tall, with 



