OP THE WASATCH REGION 95 



Herbs, not woody ; pappus wanting or scaly. 



Annual; receptacle very convex 11. Matriearia 



Perennial; receptacle flat 12. Chaenactis 



Ray-flowers present and pistillate. 

 Rays yellow. 



Leaves opposite 13. Arnica 



Leaves alternate (or all basal). 



Stems usually bearing 1 a single head. 



Pappus none 14. Balsamorrhiza 



Pappus a deeply lobed crown 15. Wyetlila 



Stems bearing more than a single head. 



Involucres viscid 16. Griiidella 



Involucres not viscid. 



All of stem-leaves sessile. . 17. Chrysopsls 

 Only upper stem-leaves sessile. 18. Seneclo 

 Rays white, pink or purple. 

 Rays few (4-15). 



Rays 4-5 19. Acuillea 



Rays 8-15. 



Rays wedge-shaped, 3-lobed 20. Layiu 



Rays linear; minutely 5-toothed 21. Aster 



Rays many (over 30) 22. Erigeron 



1. TRAGOPOGO1V. Goats-beard. 



Smooth biennial or perennial herbs from fleshy tap-roots. 

 Leaves entire, sessile; linear-lanceolate, tapering to a long 

 point. Heads large; yellow or purple. Ray-flowers truncate 

 and 5-toothed; their pappus of plumose bristles, in 1 series. 

 Disk-flowers none. Achenes long-beaked, at least all but the 

 outermost. 



1. T. porrifollus L. Salsify; Oyster-plant. Tall (2-4 ft. 

 high). Flowers purple, on thick, hollow peduncles; involucral 

 bracts usually much longer than the rays. Pappus with brown- 

 ish hairs. Escaped from cultivation. June-October. 



2. LYGODESMIA. Rush Pink. 



Smooth-stemmed, rigid and branching herbs from thick 

 tap-roots. Leaves lin,ear, becoming reduced to scales above. 

 Heads erect at the ends of the branches; solitary or sometimes 

 racemose; 3-12-flowered. Involucre cylindric; receptacle flat; 

 naked. Rays truncate and 5-toothed at apex. Achenes smooth 

 or striate. 



1. L. grandiflora T. & G. Stems perennial; simple below, 

 branched above. Heads few, more than an inch across, each 

 5-10-flowered. Involucres %-l inch high. Pappus light-brown. 

 On gravelly hills. 4,300-7,000 ft. June-July. 



3. MICKOSERIS. 



Acaulescent or subacaulescent herbs, glabrous or nearly so. 

 Heads several to many flowered, on simple scape-like 

 peduncles. Flowers yellow, all ligulate. Corolla mostly with 

 a hairy tube. Pappus white; its bristles or awns plumose, or 

 naked with chaffy base. Achenes 8-10 ribbed. 



1. M. major A. Gray. (Ptilocalais major (A. Gray) Greene). 

 Leaves entire. Heads on long peduncles, nodding in the bud. 

 Pappus of plumose bristles. Achenes truncate at the apex, 

 not beaked. Receptacle naked. Dry gravelly soil. April-May. 

 (Under the name of Ptilocalais macrolepis, Dr. Rydberg has 

 recently serrated our form from the above.) 



