38 



THE MONTANA EXPERIMENT STATION. 



42. *CUSCUTA EPITHYMUM, Murr. Alfalfa Dodder. 



Specimens of this species have come in from Livingston re- 

 ported as troublesome in alfalfa fields. It is a golden yellow para- 

 sitic vine on alfalfa and the clovers; imported from Europe, where 



it is often a most pernicious weed. 

 The infested spots should be 

 mowed closely and the plants 

 burned when dry; they should not 

 be allowed to seed as it may be dif- 

 ficult to clear the field of the para- 

 site. A native species of dodder 

 (Cuscuta arvensis) also occurs 

 sparingly on the clovers and alfalfa 

 in this state, but is not apt to take 

 the fields like the European species. 

 [Fig. 9.] 



43. *CYNOGLOSSUM OFFICIN- 

 ALE, L. Hound's Tongue. 



A European biennial established 

 in waste places at Big Timber. 



44. DRABA NEMOROSA, L. 

 Field drab a. 



A small annual of the Mustard 

 family with yellow flowers and 

 spreading pods, native of this reg- 

 ion but inclined to multiply and 

 grow rank in gardens and waste 

 places. 



45. DRACOCEPHALUM PARYI- 

 FLORUM, Nutt. Dragon-head. 



An annual plant with dense 

 square stems, opposite leaves and a 

 terminal flowering spike inclined to frequent streets and waste 

 places and occurs occasionally in cultivated ground. Doubtfully 

 native here. 



Fisr. 9. 



Cuscuta Epithymum, Murr. 

 Plant natural size. 



