238 SUB-ALPINE PLANTS 



feet in Savoy and in Switzerland, where it is parasitical upon Thyme, 

 as in parts of England. The following species of Broom-rape, with 

 the host-plant upon the roots of which they grow, have been 

 recorded from Switzerland by A. W. Bennett, Keller and Schinz, 

 etc. : 



0. minor Smith, on various plants, very commonly on Purple Clover. 



Style violet. 

 0. loricata Rchb., on Artemisia campestris. Style yellow. 

 0. Picridis Schultz, on Picris hieracioides. Plant very pale. 

 0. ScabioscB Koch., on Scabiosa Columbaria and on spp. of Carduus 



and Cirsium. Corolla yellow and violet. 

 0. epithymum DC. (0. rubra Sm., 0. alba Stephan), on Thyme. 

 0. Teucrii Holan., on Teucrium and Thymus. Spike short. 

 0. caryophyllacea Sm., on Galium. Plant yellow, scented. 

 0. flava Mart. [0. Frolichii Rchb.), on Adenosiyles, Petasites offic. 



albus and niveus, and Aconitum Lycocionum. 

 0. HedercB Duby., on Ivy. Spike elongated. 

 0. SalvicB Schultz, on Salvia glutinosa. Corolla yellow. 

 0. lucorum A.Br., on Berberis and Rubus ccesius. Corolla brownish 



yellow. 

 0. Laserpitii Sileris Reuter, on Laserpitium Siler. Stem swollen at 



base into a large ball. Corolla brownish yellow, streaked with 



violet. 

 0. elatior Sutton [0. major L.), on Ceniaurea scabiosa. Plant 



yellow. Corolla reddish brown. 

 0. CervaricB Suard. [0. alsatica Kirchl.), on Peucedanum Cervaria 



and Seseli Libanotis. Corolla fawn-coloured, tinted with violet. 



Sepals distinct. 

 0. rubens Walk. (0. gracilis Sm.), on Lotus, Hippocrepis, Genista, 



etc. Corolla reddish brown. Sepals 2-3 cleft. 

 0. Rapum Genistce ThuilL, on Broom and other Leguminosae. 



Tall, coarse, with large brown flowers. 

 0. cruenta Bert., on Medicago sativa and Melilotus. Yellow. 

 0. purpurea Jacq. {0. ccerulea Vill.), on Yarrow. Whole plant 



purplish. 

 0. IcBvis L. {0. arenaria Berk.), on Artemisia campestris. Bluish. 



Anthers hairy (smooth in purpurea). 

 0. ramosa L., on hemp and tobacco. Stem branched. 



Lathr^a L. 

 Lathrcea Squamaria L. Toothwort. 



Lathrcea is closely allied to Orobanche, but the calyx has 4 broad, 

 short teeth. Plant fleshy, yellowish white or pale purple. Raceme 



