DICOTYLEDONES 



431 



capture of insects. One family of 

 Pitcher-plants (Sarraceniacese) is exclu- 

 sively American. Two genera, Sar- 

 racenia of the Eastern states and 

 Darlingtonia of the Sierra Nevada, are 

 found iu the United States. A second 

 family, Nepenthacese, is confined to the 

 Tropics of the Old World, while the 

 Droseracese are cosmopolitan (Fig. 418). 



Order V. Resales 



The Rosales include a large number 

 of familiar plants, and show a good deal 

 of range, both in the character of the 

 vegetative parts and the flowers and 

 fruits. The flowers are usually her- 

 maphrodite and actinomorphic ; but 

 there are numerous exceptions. 



A few forms e.g. Podostemonacese (Fig. 419) are aquatics of very peculiar 

 structure, sometimes resembling Algse, rather than vascular plants. Other Ro- 

 sales are herbaceous or shrubby, and some e.g. Platanus, Robinia are trees 

 of large size. 



Among the most primitive of the Rosales are the Crassulacese (Fig. 420, D), in 



FIG. 419. Podostemon oiivaceum, en- 

 larged; t, the thalloid structure, 

 from which the fruiting shoots arise. 

 (After WARMING.) 



FIG. 420. A-C, Ribes Cynosbati. D, Sedum sp. (X 2). 



grandiflorus. 



E, F, Philadelphus 



