OROBANCHACE^ 93 



Order LXII.— 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, Sutt. ; style violet ; much the most common 

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

 loricata, Rchb. ; style yellow; on Artemisia campestris ; 

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

 Picris. 0. Scabiosm, Koch ; corolla yellow tinted with 

 violet, covered with blackish tubercles ; on Scabiosa 

 Columbaria, and on species of Carduus and Cirsium. 

 0. epithymum, DC. (rubra, Sm.) ; flowers scented, corolla 

 reddish-brown, covered with small brown tubercles; on 

 Thymus, not uncommon. 0. Teucrii, Sch. ; spike short, 

 few-flowered; on Teucrium and Thymus. O. caryophyl- 

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

 on Galium. O. Frolichii, Rchb. ; on Petasites albus ; 

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

 reflexed lobes; on species of Petasites. 0. Hederm, 

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

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

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



