OF THE WASATCH REGION 99 



1. M. suaveolens (Pursh) Buchenau. (M. discoidea DC.; M. 

 matricarioides (Less.) Porter). Pine-apple Weed; Green or 

 Rayless Dog-fennel. Annual, glabrous and homely aromatic 

 plants with a very leafy and at length much -branched stem; 

 6-18 inches high. Leaves thickish; 2-3 pinnately-dissected into 

 linear lobes; rosette-forming at base. Heads numerous. Rays 

 none. Achenes faintly nerved. A familiar weed of waste 

 places. March -November. 



12. CHAENACTIS. 



Herbs with alternate, mostly pinnately-dissected leaves. 

 Inflorescence solitary or corymbose; heads bearing disk-flowers 

 only. Bracts in 1 series; linear, equal. Flowers yellowish or 

 tinged with pink. Receptacle flat. Pappus of entire, persistent 

 nearly transparent scales. Achenes angled. 



1. C. Douglasii H. & A. Grayish -white or sometimes gla- 

 brate, perennial; 6-12 inches high from a short and erect 

 caudex. Heads corymbose, short-peduncled. 



13. ARNICA. 



Leaves simple, mostly opposite. Heads many-flowered; 

 usually large and radiate; solitary or corymbed. Flowers yel- 

 low. Rays (if present) pistillate. Receptacle flat. Pappus a 

 single row of somewhat rigid, minutely barbed bristles. 



1. A. cordifolia Hook. Stem 6-24 inches high, more or less 

 villous and glandular above. Basal and lower stem-leaves 

 strongly heart-shaped to ovate, coarsely toothed, on long 

 petioles; upper stem-leaves on short petioles or nearly sessile. 

 Heads usually solitary (sometimes 2-8) on slender peduncles. 

 Involucral bracts villous; lanceolate to oblong, acuminate. 

 Rays about 15. Achenes minutely barbed. In rich, moist soil 

 in mountain valleys, in light shade or in exposed places. June- 

 August. 6.000-11,000 ft. 



14. BALSAMORRHIZA. Balsam Root. 



Low perennial herbs with thick tap-roots. Leaves mostly 

 basal; large and long-petioled. Heads large and showy, mostly 

 solitary on long peduncles. Involucre broad, the outer bracts 

 leafy. Rays yellow, each with a distinct tube, pistillate. 

 Achenes without pappus; those of disk 4-angled. 



Leaves sagittate with entire margins 1. B. sagittata 



Leaves pinnately cleft, parted or divided. 



Herbage canescent 2. B. Hooker! 



Herbage green; glandular-viscid 3. B. macrophylla 



1. B, Knjurfttata Nutt. Arrow-leaved Balsam Root or "Big 

 Sunflower." Silyery-canescent; the involucre white-woolly. 

 Basal leaves entire; hastate; 4-9 inches long, on still longer 

 petioles; cauline few, from linear to spatulate. Scape at length 

 a foot or more high. Rays 11-16. From a woody and rough- 

 barked tap-root often 3 feet or more in length. Dry hills. 

 April-June. 4,000-6.000 ft. 



2. B. Hooker! Nutt. (B. Balsamorrhiza (Hook.) Heller). 

 Grayish -white with fine hairs. Root fusiform with smooth 

 bark; 8 inches or less in length. Leaves 8-12 inches long; 

 lanceolate, once or twice pinnately-parted into lanceolate or 

 linear lobes, ,or some of them with only a few lobes or coarse 

 teeth. Dry" gravelly plains. May. 



