Rydberg : Rocky Mountain flora 567 



the seeds, which are apparently smooth, the fine murication being 

 seen only under a strong lens. A. gracilis grows in sandy soil, 

 on hillsides and in river bottoms at an altitude of 1,500-2,500 m. 



Colorado: Foothills, Larimer County, 1895, /. H. Cowen 

 (type); Ridge below Tobe Miller's, Cowen; Salida, 1898, Baker, 

 Earle & Tracy 14 (in part) ; mesas near Pueblo, 1900, Rydberg & 

 Vreeland 5865. 



Wyoming : Fort Steele, 1901, Tweedy 4573 and 4574. 



Idaho: Common, 1892, Isabel MidJ r or d. 



" Oregon " : Nuttall's specimens of Tr achy phy turn gracile. 



Acrolasia latifolia sp. no v. 



Stout annual, 3-5 dm. high, branched ; leaves sessile, ovate or 

 ovate-lanceolate, coarsely toothed or entire, 5-10 cm. long, 2-3 

 cm. wide; sepals lanceolate, 2.5-3 mm - l° n g ; petals obovate- 

 spatulate, about 5 mm. long; capsule linear, cylindric, 2.5-3 cm - 

 long, about 2.5 mm. thick, sessile; seeds prismatic, muriculate. 



This has been mistaken for A. integrifolia on account of its 

 broad, merely toothed leaves, but the sepals and seeds place it in 

 the A. albicaulis group and nearest the preceding and A. cteno- 

 phora. It grows on hills at an altitude of 1,200-2,400 m. 



Colorado : Mountains between Sunshine and Ward, 1902, 

 Tweedy 5149 (type); Boulder, 1901, Osterhout 2471 ; Larimer 

 County, 1895, Cowen. 



Epilobium ovatifolium sp. nov. 



Plant 2-6 dm. high, propagating by turions ; stem glabrous 

 except the decurrent lines which are more or less crisp-hairy, 

 especially above ; leaves sessile or nearly so, ovate or ovate-lan- 

 ceolate and acute, or the lowest oval and obtuse, 3-4 cm. long, 

 entire or denticulate, glabrous ; petals purple or rarely rose, 5-7 

 mm. long; pods 5-6 cm. long, 1.5-2 mm. in diameter, sessile, 

 more or less crisp and glandular hairy ; seed a little over 1 mm. 

 long, abruptly contracted above, but without neck ; coma white, 

 about 6 mm. long. 



The type specimens are labeled E. Hornemannii Reichenb. 



which it resembles somewhat in general habit ; but that species 



propagates in an altogether different way and the leaves are more 



or less petioled. The present species is more closely related to 



E. brevistylum and E. glandulosnm. It differs from the former 



