PLATE XXXIX. 



1. OENOTHERA FRUTICOSA. 



SHRUBBY OENOTHERA. 



THIS genus contains plants of the herbaceous, biennial, peren- 

 nial and under shrubby perennial kinds. 



It belongs to the class and order Octandria Monogynia, and ranks 

 in the natural order of Calycanthem(R. 



The characters are: that the calyx is a one-leafed, superior, deci- 

 duous perianthium: tube cylindrical, erect, long, deciduous: bor- 

 der four-cleft: the segments oblong, acute, bent down: the corolla 

 has four petals, obcordate, flat, inserted into the interstices of the 

 calyx, and the same length with the divisions of the calyx: the sta- 

 mina have eight awl-shaped filaments, curved inwards, inserted into 

 the throat of the calyx, shorter than the corolla: anthers oblong, 

 incumbent: the pistillum is a cylindrical germ, inferior: style fili- 

 form, the length of the stamens: stigma four-cleft, thick, blunt, 

 reflex: the pericarpium is a cylindrical capsule, four-cornered, four- 

 celled, four-valved, with contrary partitions: the seeds very many, 

 angular, naked : the receptacle columnar, free, four-cornered, with 

 the angles contiguous to the margin of the partitions. 



The species cultivated are: 1. O. bicnnis, Broad -leaved Tree- 

 Primrose; 2. 0. longijtora, Long-flowered Tree-Primrose; 3. 0. mol- 

 lissima, Soft Tree-Primrose; 4. O. fruticosa, Shrubby Tree- Prim rose; 

 5. O. pumila, Dwarf Tree-Primrose. 



The first has a biennial fusiform fibrous root, yellowish on the 

 outside, while within: from this, the first year, arise many obtuse 

 leaves, which spread flat on the ground; and from among which, 

 the second year, the stems come out, three or four feet high, upiight, 



