12 



THE MONTANA EXPERIMENT STATION. 



III. PERENNIALS. 



f Achillea Millefolium, L. 

 Artemisia Ludoviciana, Nutt, 

 *Cnicus undulatus, Gray. 

 Epilobium angustifolium, L. 

 Gaura coccinea, Nutt, 

 Glycyrrhiza lepidota, Pursh. 

 Helianthus Nuttallii, T. & G. 

 Iva axillaris, Pursh. 



*Lepachys columnaris, T. & G. 

 Lupinus pusillus, Pursh. 

 Lupinus sericeus, Pursh. 

 Lygodesmia iuncea, Don. 

 *Malvastrum coccineum, Gray 

 Platago Asiatica, L. 

 *Rumex salicifolius, Weinm. 

 ^Verbena bracteosa, Michx. 



*Lactuca pulchella, DC. 



This would give the composition of our weed flora as 





Native. 



Introduced. 



Total 





19 

 5 



17 



66 



9 



16 



85 





14 





35 









41 



93 



134 



It thus appears that more that two-thirds of the weeds 

 already noted in the state are of foreign origin and may be kept 

 out of districts in which they are not already established, while, 

 unless preventive measures are taken, the number of such intro- 

 ductions will be greatly increased. 



The species enumerated below appear to be extending gradu- 

 allv westward from the Plains. 



Allionia nyctaginea, Michx. 

 Amaranthus albus, L. 

 A. blitoides, Wats. 

 Cerastium nutans, Raf. 

 Cleome integrifolia, T. & G. 

 Cnicus undulatus, Gray. 

 Echinospermum Redowskii, Lehm. 

 Euphorbia marginata, Pursh. 

 Franseria Hookeriana, Nutt. 

 Gaura parviflora, Dougl. 



Grindelia squarrosa, Dunal. 

 Helianthus animus, L. 

 Iva xanthiifolia, Nutt. 

 Hordeum jubatum, L. 

 Krinitzkia crassisepala, Gray. 

 Lepachys columnaris, T. & G. 

 Lepidium apetalum, Willd. 

 Monolepis chenopodioides, Moq. 

 Panicum capillare, L. 

 Plantago Patagonica, Jacq. 



Solanum triflorum, Nutt. 



A few species are coming into the state from the Pacific coast: 



Artemisia biennis, Willd. Madia filipes, Gray. 



Chenopodium capitatum, Wats. Matricaria discoidea, DC. 



Echinospermum deflexum, Lehm. Kumex salicifolius, Weinm. 



Epilobium paniculatum, Nutt. Sisymbrium incisum, Engclm 



Madia glomerata, Hook. Xanthium spinosum, L. 



