Uribe Ambrosieas , 
Erect weedy plants with alternate leaves. Heads of two kinds, those 
containing the staminate flowers small and greenish, arranged in terminal 
racemes or panicles, tue involucres cup-shaped, those containing the pis- 
tillate flowers diverse, either burr-like with hooked spines or like a 
small nutlet with a series of small teetn near the apex, the involucres in 
either case bein, completely closed, the corollas rudimentary or none. 
Antners distinct or nearly soe FPappus none. 
