OROBANCHACE^ 93 



Order LXIL— OROBANCHACE.E. 



Brown leafless root-parasites ; stem usually simple ; 

 flowers in spikes or racemes ; sepals 4-5 ; corolla 2- 

 lipped; stamens 4, didynamous; ovary i -celled; seeds 

 numerous, minute. Widely distributed, chiefly in South- 

 ern Europe and Eastern Asia ; not alpine. 



I. Orobanche, L. 



Characters of the Order. The numerous species of 

 Broom-Rape are best characterised by the plant on the 

 root of which they carry on a parasitic growth. The 

 following species are recorded from Switzerland : — 



0. minor y Sutt. ; style violet ; much the most common 

 species ; on various plants, very commonly on clover. O. 

 loricatUy Rchb. ; style yellow; on Artemisia campestris ; 

 Valais. O. Picridis^ Vauch. ; whole plant very pale ; on 

 Picris. 0. Scabiosce^ Koch ; corolla yellow tinted with 

 violet, covered with blackish tubercles ; on Scabiosa 

 Columbaria^ and on species of Carduus and Cirsium. 

 0. epitky77zumy DC. {rubra^ Sm.) ; flowers scented, corolla 

 reddish-brown, covered with small brown tubercles; on 

 PhymuSy not uncommon. O. Peucrii, Sch. ; spike short, 

 few-flowered ; on Peucrium and Phymus. O. caryophyl- 

 laceay Sm. {Galii, Vauch.) ; plant yellow, flowers scented ; 

 on Galium. O. Frolichiiy Rchb. ; on Petasites albus ; 

 AppenzeU. O. flava, Mart. ; upper lip of corolla with 

 reflexed lobes; on species of Petasites. O. HedercBy 

 Vauch. ; spike elongated ; on ivy, frequent. O. SalvicBy 

 Sch.; corolla yellow; on Salvia glutinosa. O. lucoricm, 

 A. Br. ; corolla brownish-yellow ; on Berberis ; Engadine, 



