210 BRITISH FLOWERING PLANTS chap. 



PiMPINBLLA 



We have two species — P. Saxifraga, which is 

 very commou in pastures ; and P. magna, which is less 

 frequent and larger, preferring mountainous and shady 

 places. 



SlUM 



This genus is represented by two species — S. lati- 

 folium, which has the umbels all terminal, and S. 

 angustifolium, in which many of them are lateral. 



S. latifolium. — Some of the flowers are complete, some 

 male, and the arrangement seems to differ in different 

 localities. The flower-heads, which are at first upright, 

 gradually turn to the side, and in this position the 

 pollen of the upper flowers may fall on and fertilise the 

 lower ones. This happens in many Umbellifers. 



CEnanthe 



We have four well-marked species. Two have long 

 linear leaves ; one, CE. fistulosa, with hollow, the other, 

 CE. pimpinelloides, with nearly solid stems. The other 

 two have broadly cuneate leaves, one, CE. crocata, with 

 large terminal umbels, while the other, CE". Phellan- 

 drium, has most of them opposite to the leaves. 



CE. fistulosa has andromoncecious, and also almost 

 homogamous complete flowers, which are generally cen- 

 tral. Some plants appear to produce male flowers only. 



(E. aquatica. — Flowers resembling those of the preced- 

 ing species. 



^THUSA 



M. Oynapium. — The flowers have been described by 

 Kerner and Schulz, who, as in so many other cases, 

 give quite different accounts. According to Schulz 

 the complete flowers are homogamous or slightly pro- 

 tandrous, while Kerner found them protogynous, It 

 is probable, therefore, that they differ in different 

 localities. 



