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STANDLEY — FLORA OF GLACIER PARK. ' 433 



Leaves hairy or woolly. 

 Leaves silky-hairy, the hairs straight, not matted; leaves di\'ided into numerous 

 linear lobes. 

 Leaves 1 to 1.5 cm. long, densely covered with white silky hairs; heads veiy 



hairy . 4. A. frigida. 



Leaves 3 to 12 cm. long or longer, thinly hairy; heads glabrous or slightly hairy. 



Heads very numerous, 2 to 3 mm. broad 5. A. forwoodii. 



Heads few, 4 to 5 mm. broad 6. A. spithamaea. 



Leaves woolly, at least on the lower surface, with matted white hairs. 

 Leaves twice divided into linear lobes, often green on the upper surface. 



7. A. discolor. 

 Leaves entire, toothed, or once lobed, white on both surfaces. 



Lower leaves entire or shallowly toothed 8. A. gnaphaloides. 



Lower leaves lobed. 



Leaves deeply lobed, the lobes numerous, linear or oblong . 9. A. floccosa. 

 Leaves with a few (3 or 5) broad lanceolate lobes ... 10. A. diversifolia. 



1. Artemisia cana Pursh. Sagebrush. Frequent on prairie about the east 

 entrance. Oreg. to Sask., Colo., and Utah. — Densely branched shrub, 30 to 60 cm. 

 high, covered with fine whitish hairs; leaves 2 to 4 cm. long, acute; heads in a 

 spikelike panicle. 



The common sagebrush, Artemisia tridentata Nutt., apparently does not grow about 

 the park. 



2. Artemisia biennis Willd. In dried-up pools on prairie about the east entrance; 

 scarce. B. C. to Calif., N. J., and N. S. — Biennial, 30 to 100 cm. high, with purplish 

 stems; lobee of the leaves linear or lanceolate, toothed or lobed; heads 2 to 3 mm. 

 wide, in a dense, very leafy panicle; flowers yellow. 



3. Artemisia dracunculoides Pursh. Dry flats near St. Mary and Babb. B. C. to 

 Calif., Tex., and Mo. — Plants perennial, erect, 0.5 to 1 meter high, glabrous; leaves 

 3 to 7 cm. long; heads glabrous, 2 to 3 mm. wide. 



4. Artemisia frigida Willd. Rocky flats or prairie about St. ^lary and the east 

 entrance, frequent; dry gravel bank near Belton, rare. Alaska to Idaho, Ariz., and 

 Tex.; also in Asia. — Silky-hairy perennial, 15 to 40 cm. high, forming dense silvery 

 clumps; leaves twice divided into very slender lobes; heads 4 to 5 mm. broad, in 

 narrow panicles; flowers yellow. 



Among the Blackfoot Indians a decoction of the plant was used as a drink in cases 

 of fever. The leaves were chewed as a remedy for heartburn. Branches were 

 generally tied to articles which were offered to the sun. 



5. Artemisia forwoodii S. Wats. Occasional on the east slope at low altitudes, 

 on open rocky hillsides or on flats. Yukon to Ont., Mich., and Ariz. (A. camporum 

 Ptydb.) — Plants in clumps, 20 to 50 cm. high, with stout stems; leaves long-stalked, 

 2 or 3 times divided into linear lobes: heads 2 to 3 mm. high, in narrow dense panicles. 



6. Artemisia spithamaea Pursh. Collected on Mount Henry by Umbach. Wash, 

 to Colo., Que., and Greenl. — Similar in appearance to A. forwoodii, but the plants 

 lower, 10 to 30 cm. high; leaves once or twice divided into linear lobes. 



7. Artemisia discolor Dougl. Frequent at nearly all altitudes on the east slope,, 

 on the west slope chiefly at high altitudes; on open, usually rocky slopes, on rock 

 slides, or in thickets; frequent above timber line. B. C. and Wash, to Sask. and 

 Colo. {A. michauxiana Besser.) — Perennial, 20 to 50 cm. high, forming dense bushy 

 clumps; leaves 3 to 6 cm. long, white- woolly beneath, often green and glabrous on 

 the upper surface; heads 3 to 4 mm. high, green, in narrow, usually spikelike panicles. 



The plants are somewhat variable. The typical form has a narrow panicle and 

 rather broad leaf segments; A. michauxiana is the form with spikelike panicles and 

 narrow leaf segments. Both forms occur in the park, but the second one is much 

 more common. 



