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, shorter 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 33 (type, 
in herb. N. Y. Bot. Gard.). 
Utau: Near Salt Lake City, May 1882, M. E. Jones. 
British CoLtumsia: 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: 110, 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. II. 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 
