CHAP. IV.] THE GENUS CLARKIA. 83 



shown at a in Jig. 34, which represents seed- 

 vessels of Epilobium roseum^ a very common 

 weed in the neighbourhood of London. The 

 limb of the calyx is four-cleft, and the corolla 

 has four petals ; and when these fall off, the 

 ovary assumes the appearance shown 

 at a. The quadrangular form is re- 

 tained by the capsule, which, when 

 it ripens, bursts open into the four 

 valves (6), and discharges the seed op'^Epix^Bi^t^:^ 

 which was attached to the central 

 placenta (c) ; each seed being furnished with a 

 little feathery tuft resembling pappus, as shown 

 in^^. 35. The genus Epilobium is divided into 

 two sections ; the plants in one of which have 

 irregular petals, the stamens bent, and the 

 stigma divided into four lobes, as in the French 

 Willow- Herb, and the other showy species ; and 

 the plants in the other section having small 

 flowers with regular petals, erect stamens, and 

 the stigma undivided. 



THE GENUS CLARKIA. 



The calyx in this genus is tubular, with the 

 limb in two or four lobes, as in OEnothera. The 

 corolla is, however, very different, the four petals 

 being unguiculate or clawed ; that is, so much 

 narrower in the lower part as to stand widely 

 apart from each other ; they are also three 



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