184 Flora of the Palouse Region 



306. CHRYSOPSIS. 



Low herbs: leaves numerous, alternate, sessile: heads solitary 

 or in con-nibs with yellow flowers: rays fertile or sometimes want- 

 ing: involucral-seales narrow, acute, withscarious margins: recep- 

 tacle flat: style-branches with appendages: pappus double, of two 

 kinds, the interior of long copious capillary bristles, the exterior 

 of short bristles or chaffy scales: akenes oblong-linear or ovate- 

 oblong, compressed, hairy. 



C. villosa Nutt. Perennial, the stems decumbent or suberect, 15-30 cm. 

 long, canescent throughout and more or less villous: leaves numerous, ob- 

 long or oblanceolate, mostly acute, sessile or nearly so, 2-3 cm. long: heads 

 solitary or corymbed, terminating short leafy branches: involucre hem- 

 ispherical, 1-1.5 cm. broad; bracts canescent or nearly glabrous: rays golden- 

 yellow: akenes obovate, pubescent: outer pappus very short. Rocky banks 

 of Snake River, variable. 



307. BIGELOVIA. 



Herbs or uudershrubs: leaves narrow, alternate: heads mostly 

 small, with 5-30 yellow flowers, in corymbs cymes or panicles: 

 flowers all perfect, with tubular corollas: rays none: involucre im- 

 bricated: receptacle flat: pappus simple, of copious unequal 

 tawny capillary bristles: style-branches with appendages: akenes 

 narrow, terete or angular, slightly if at all compressed. 



B. graveoleriS var. albicaulis Gray. Shrub, 30-90 cm. high, with num- 

 erous, erect, somewhat fascicled branches, these densely white-woolly: leaves 

 numerous, narrowly-linear, entire, white-woolly, somewhat pungently 

 pointed, 2-6 cm. long: heads numerous, in terminal dense corymbs: invol- 

 ucre about 8 mm. high; the bracts acutish, sparsely tomentose or glabrate: 

 corolla-tube villous, the lobes lanceolate: akenes linear: pappus soft. Banks 

 and bluffs of Snake River. 



308. APLOPAPPUS. 



Herbs or low uudershrubs: leaves alternate, rigid: heads solitary, 

 terminal, or clustered, many-flowered: ray-flowers fertile or rarely 

 none: involucre imbricated; bracts with or without foliaceoustips: 

 receptacle flat or flattish: pappus tawny or reddish, of copious and 

 unequal capillary bristles, somewhat rigid: style-branches with 

 appendages: akenes turbinate and linear, terete, angled or more 

 or less compressed. 



Heads large, 1.5-2.5 cm. broad: rays very small. A. CARTHAMOIDES. 



Heads smaller, 1-1.5 cm. broad: rays conspicuous. A. RACEMOSUS. 



A. carthamoides Gray. Erect, stout, 30-40 cm. high, rough-pubescent 

 or scabrous, becoming glabrous: basal leaves spatulate-lanceolate, coriaceous, 

 cuspidate, entire or nearly so, 10-40 cm. long; upper cauline smaller, sessile, 

 bv rather broad bases; heads solitary, terminal or 1-2 in the upper axils, 1.5- 



