PHANEROGAMIC PARASITES 71 



certain substances which protect the parasite from toxins 

 and injurious substances secreted by the host. 



Fraysse, A., New Gen. Bot., 19, p. 49 (1907). 

 Peirce, G. T., Ann. Bot., 7 (1893). 



The broomrapes are simple or branched plants with rather 

 stout stems eight inches to two feet high, and covered at the 

 lower part with sessile, scale-like leaves, destitute of chloro- 



FIG. 10. Lesser Broomrape (Orobanche minor, Sutt.). 

 reduced. (Eng. Bot.) 



Entire plant, much 



phyll. The upper part of the stem terminates in a spike of 

 two-lipped flowers of a dull yellow, red, or purplish colour. 

 In one species the flowers are blue. 



But little real injury to economic plants is noticed in this 

 country. I have observed O. minor (= O. Hederae of some 

 authors) growing most profusely on the roots of ivy in Kew 

 Gardens for many years, without apparently causing the host- 

 plant any inconvenience. I also had several tomato plants 



