SUPPLEMENT TO THE FLORA OF MONTANA. 49 



URTICACE/E. 



Ulmus Americana, L. "White Elm." Frequent in the bottoms 

 and coulee thickets along the Missouri River from Box Elder Cr. 

 near Calais and eastward. Forms deep forests in the bottoms at 

 Arden and is often of large size. Grown for shade in many parts of 

 the state, but rarely hardy above 3000 feet. 



*Urtica dioica, L. Leonia, Sept. 16, 1900; Libby, July 26, 1900. 



POLYGONACE^E. 

 Eriogonum brevicaule, Nutt. Custer Station, June 30, 1890. 



Eriogonum ovalifolium depressum, n. var. 



Leaves 5 mm. long; peduncles 2-4 cm. high; heads single on the 

 peduncle, small and few-flowered : involucres 2 mm. long, 5-flow- 

 ered : pedicels 2 mm. long: sepals ij/2-2 mm. long, white or pur- 

 plish tinged., while in the species these characters are at least twice 

 as large and the involucres about 2o-flowered. In dense, caespi- 

 tose, hemispherical clusters on dry decomposed rocks at about 10,000 

 feet altitude. 



Doubtfully more than an alpine variety of the species, as connect- 

 ing forms seem frequent in collections and the characters are alike 

 except in size. 



Black Butte, Tobacco Root Range, Aug. n, 1902; Old Hollowtop, 

 July 9, 1897, Rydberg & Bessey, 5338; Nyack, Aug. 25, 1902, M. J. 

 Elrod ; the last two collections not so characteristic as the first. 



PoLygonum acre, HBK. Flathead Lake, Aug. 1897, M. J. Elrod, 

 260. Rare here. 



*Polygonum aviculare, L. Yard- Grass ; Goose Grass. The 

 typical form with narrow acute leaves seems to be frequent in 

 moister localities west of the Divide, but replaced eastward by 

 P. littoralc. Link. A common weed in dooryards and by roadsides. 



Columbia Falls, July 20, 1900; Missoula, Sept. 6, 1899; Thompson 

 Falls, Aug. 6, 1901. 



*Polygonum erectum, L. A common weed in many localities 

 in the eastern part of the state. Often prostrate in hard dry ground. 

 Malta, Sept. 9, 1900; Wibaux, July 9, 1901; Big Timber, July 13, 

 1901 ; Calais, July 14, 1900. 



Polygonum jejunum, Greene, Pittonia, 5: 198. 



"Spanish Peaks, Madison Range, July 14, 1896, J. Ff. Flodman, 

 No. 368; Indian Creek, 1897. Rydberg & Bessey, No. 5357." 



