Rydberg: Studies on the Rocky Mountain flora 463 



5-15 mm. long, suberect or strongly ascending; calyx-tube 

 obpyramidal, about 2 mm. long; lobes lanceolate, about 1.5 

 mm. long, acute; corolla small, s^iorter than the calyx. 



This is related to A. occidentalis, but the plant is more delicate, 

 the scapes solitary, bearing a 1-4-flowered umbel with strongly 

 ascending or nearly erect pedicels, the bracts smaller and dis- 

 tinctly acute. 



Montana: Missoula, May, 1897, Elrod & assistants jj (type, 

 in herb. N. Y. Bot. Card.). 



Utah: Near Salt Lake City, May 1882, M. E. Jones. 



British Columbia: Lytton, April 17, 1889, Macoun. 



Dr. Greene separates an American species Androsace capil- 

 laris Greene from the Asiatic A. filiformis Retz, and claims that 

 the former is a perennial. All American specimens that I have 

 seen are, however, annuals, and I can see no reason for such a 

 separation. 



Dodecatheon Jaffreyi Moore has been collected near Sawtooth, 

 Idaho, by Evermann. 



GENTIANACEAE 

 Anthopogon ventricosum (Griseb.) Rydb. 

 Gentiana ventricosa Griseb. in Hook. Fl. Bor.-Am. 2: 65. 1838. 



Anthopogon Macounii (Holm) Rydb. 

 Gentiana Macounii Holm, Ottawa Nat. 15: no, 179. 1901. 



Anthopogon tonsum (Lunell) Rydb. sp. nov. 

 Gentiana detonsa tonsa Lunell, Bull. Leeds Herb. 2 : 7. 1908. 



This is closely related to A. Macounii (Holm) Rydb., but 

 differs in the glabrous filaments, a character not pointed out by 

 Dr. Lunell, 



Amarella tortuosa (M. E. Jones) Rydb. 

 Gentiana tortuosa M. E. Jones, Proc. Calif. Acad. H. 5: 707. 1895. 



Amarella ventorum Rydb. sp. nov. 

 Gentiana arctophila densiflora Torr. Fremont's Rep. 94. 1845. 



Not G. arctophila densiflora Griseb. 



Low annual or biennial, branched near the base; stems 5-10 

 cm. long, branched, internodes shorter than the leaves; basal 



