THELESPERMA— TOWNSENDIA 207 



1. Rays none or 4-6 mm. long; awns of the pappus 



much longer than the width of the achene T. grdcile 



2. Rays usually present, 12-15 mm. long; awns of 



the pappus shorter than the width of the 

 achene, or none 



a. Awns or scales of the pappus 2 ; lobes of disk- 



corolla linear to lanceolate, longer than the 



throat T.trifidum 



b. Pappus a tiny 4-5-toothed crown or none; 



lobes of disk corollas oblong to ovate, short- 

 er than the throat T. subnudum 



Townsendia Hooker 1834 Townsendia 

 I Xamed for Townsend, an American botanist) 



Heads with pink, purple or white pistillate ray-flowers, disk-flowers 

 mostly perfect, achenes of the disk compressed, those of the rays usually 

 3-angled, pappus of bristles or scales or both ; receptacle flat, without chaff, 

 involucre hemispheric to bell-shaped, bracts imbricated in several rows ; 

 heads solitary on the branches ; leaves alternate or basal, entire ; tufted 

 perennials. 



1. Bracts of the involucre tapering to a long point 



a. Stem with many spreading branches from the 



base ; pappus of the ray flower a crown of 



short scales T. grandiflora 



b. Stem erect, not branched at base ; pappus with 



2 awns or wholly of bristles 



(1) Pappus wholly of bristles; stem 1-8 in. or 



lacking T. Pdrryi 



(2) Pappus a crown of scales with 2 awl- 



shaped awns; stems 6-15 in. high T.eximia 



2. Bracts of the involucre short-pointed, acute or 



obtuse 

 a. Stems 1-10 in. high, at least when mature; 

 leaves and stems gray-hairy 



(1) Leaves spatulate ; pappus of ray flower of 



both bristles and scales T. Wdtsoni 



(2) Leaves narrowly oblanceolate to linear; 



pappus almost wholly of bristles or 

 scales 

 (a) Pappus of the ray flower of many 



bristles ; stems 1-5 in. high T. incana 



