100 SPRING FLORA 



3. B. mncrophylla Nutt. Green and glabrate. slightly glan- 

 dular-viscid. Leaves usually large (as much as a foot long), 

 ovate or oblong, more or less pinnately-parted into broadly 

 lanceolate entire-margined lobes. Heads large on scape-like 

 and leafy-bracted peduncles 1-2 ft. long. In rich soil in moun- 

 tain valleys. June-August. 



15. WYETHIA. 



Stout perennial simple-stemmed herbs with large, erect, 

 alternate leaves. Heads large; usually solitary. Involucral 

 bracts imbricated in 3 rows, the outer ones leafy. Rays long, 

 yellow, pistillate. Receptacle flat. Pappus with a chaffy 

 crown. 



1. W. amplexicaulfg Nutt. 1-2 ft. high; balsamic-viscid. 

 Leaves elliptical-lanceolate; entire or denticulate; the basal 

 often a foot or more long. Dry hills, often in immense 

 "patches." May-July. 4,500-7,000 ft. 



14. GRINDELIA. Gum Plant. 



Coarse biennial or perenial herbs (more or less woody at 

 base). Leaves leathery; alternate; sessile or clasping; spinu- 

 lose-dentate. Heads many-flowered; solitary on the ends of 

 leafy branches. Bracts of the hemispheric involucre imbricated 

 in several series; their tips slender and more or less spreading 

 or recurved. Ray-flowers pistillate (or rarely wanting). 

 Disk-flowers yellow; perfect or sometimes staminate only. 

 Pappus of 2-8 deciduous awns or bristles. Achenes 4-5 ribbed. 



1. G. squarrosa (Pursh) Dunal. Glabrous, erect or ascending, 

 10-24 inches high. Leaves obtuse; linear-oblong to spatulate. 

 Involucral bracts recurved at tips; pappus-awns 2-3. Achenes 

 truncate, not toothed. An abundant weed of dry plains and 

 waste places. Jan. -Nov. Locally called "Arnica." 



17. CHRYSOPSIS. Golden Aster. 



Annual, biennial or perennial herbs, with pubescence from 

 hispid to silky. Leaves alternate; sessile; entire or few- 

 toothed. Flowers yellow, in many-flowered heads. Rays 

 numerous or wanting; pistillate if present. Achenes flattened, 

 hairy. Pappus double; that of the outer flowers of short and 

 somewhat chaffy bristles, while that of the inner is of long 

 capillary bristles. 



1. C. foliosa Nutt. (C. villosa foliosa Eaton). 1-2 ft. high, 

 grayish -white with appressed silky pubescence. Leaves short, 

 from oblong or elliptical to lanceolate. Heads rather numerous 

 and clustered. Rays numerous. Dry hillsides and plains. June- 

 July. 



18, SENECIO. Groundsel; Ragwort; Squaw-weed. 



Annual or perennial herbs (sometimes woody). Leaves basal 

 or alternate. Heads solitary, cymose or paniculate, of mostly 

 yellow flowers; ray-flowers wanting or pistillate and fertile; 

 disk-flowers perfect and fertile, with tubular corollas. Pappus 

 of many soft-capillary bristles. Involucre usually of a single 

 row of equal, erect scales. Receptacle flat, without scales. 



Leaves entire 1. s. perplexus 



Leaves lobed or pinnatifid. 



Plant glabrate; leaves light-green, leathery. 2. S. uintahensis 

 Plant glabrous; leaves darker-green, not leath- 

 ery 3. s. pscudaureiis 



