PLATE XL VI. 



1. RUDBECKIA PURPUREA. 



PURPLE RUDBECKIA, 



This genus contains plants of the herbaceous biennial and peren- 

 nial kinds. 



It belongs to the class and order Sijngenesia Polygamia Fritstratiea, 

 and ranks in the natural order of Composita Oppositifolice. 



The characters are: that the calyx is common with a double row 

 of scales; scales flat, widish, curtailed, six in each row: the corolla 

 compound radiate: corollels hermaphrodite, numerous, in a conical 

 disk; I'emales about twelve, very long in the ray: proper of the her- 

 maphrodite, tubular- funnel-form, with a five- toothed border: female 

 ligulale, lanceolate, with two or three teeth, flat, pendulous: the 

 stamina in the hermaphrodites: fdamenls five, capillary, very sliort^ 

 anther cylindrical, tubular: the pistillum in tiie hermaphrodites: 

 germ four-corned: style filiform, the length ot' ihc corollct: stigma 

 two-parted, revolute: in the females: germ very sn^all: style none: 

 stigma none: there is no pericarpium: calyx unchanged: the seeds 

 in the hermaphrodites solitary, oblong, crowned with a membrana- 

 ceous four-toolhcd rim: in the females none: the receptacle chaffy, 

 conical, longer than the common calyx: chaffs the length of the 

 seeds, erect, channelled-concave, deciduous. 



The species cultivated are: 1. R. laciniato, Broad Jagged-leaved 

 Rudbeckia; 2. R. digitata. Narrow Jagged-leaved Rudbeckia; 3. R. 

 Iiirtd, Hairy Rudbeckia; 4. R. purpurtu. Purple Rudbeckia; 5. R. 

 angustij'olia, Narrow Simple-leaved Rudbeckia; 6. R. triloba, Three- 

 lobed Rudbeckia. 



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