COMPOSITAE. 



255 



ceptacle naked ; staminate flowers with the pappus-bristles thick- 

 ened or barbellate at the apex; pistillate with the slender pappus- 

 bristles united at base into a ring. 



Pappus bristles of staminate flowers not dilated at the tips. 



Heads several, brown. A. stenophylla. 



Heads solitary, whitish. A. dimorpha. 



Pappus bristles of staminate flowers dilated at tips. 

 Plants not stoloniferous. 



Pistillate heads oblong, the bracts pinkish. A. geyeri. 



Pistillate heads not oblong, the bracts white. 



Pubescence floccose-woolly. A. pulcherrima. 



Pubescence close, silky. A . luzuloides. 



Plants stoloniferous. 



Heads loosely racemose; inflorescence glandular. A. racemosa. 



Heads corymbose; inflorescence not glandular. 



Leaves oblanceolate, 3-5 cm. long, green above. A. howellii. 

 Leaves smaller, narrower, grayish above. 



Heads 6-8 mm. high; bracts white or pinkish. A. parvifolia. 

 Heads 4-7 mm. high; bracts rosy, rarely white. A. rosea. 



Antennaria stenophylla Gray. Stems slender, erect, leafy, 10-15 cm. high, 

 without stoloniferous branches; leaves narrowly linear, 3-6 cm. long, attenuate 

 at each end, covered with a fine appressed silvery wool; heads few, in a dense 

 cluster; involucre turbinate, 3-5 mm. high; bracts obtuse, dark brown or in 

 the staminate plant the inner ones white-tipped; akenes scabrous. In thin 

 rocky or " scab " lands, locally abundant. 



Antennaria dimorpha (Nutt.) T. & G. Densely tufted from stout root- 

 stocks, 2-5 cm. high, silvery canescent throughout; leaves spatulate or ob- 

 lanceolate, mostly acute, 1-2 cm. long; heads solitary, on very short few leaved 

 stems; staminate heads subglobose, 8 mm. high, the involucral scales ovate- 

 lanceolate, obtuse; pappus not thickened at the tip, minutely toothed; pis- 

 tillate head subcylindric, 8-12 mm. high, with broadly lanceolate, mostly acute 

 involucral scales, glabrous except at base; pappus of long fine smooth bristles; 

 akene oblong-linear, pubescent with short hairs, which are 2-hooked at the 

 summit. Stony soil, often occupying considerable areas. 



Antennaria geyeri Gray. Persistently white-tomentose throughout; stems 

 stout, from a branched woody base, 8-20 cm. high; leaves spatulate to ob- 

 lanceolate, acute, 1-2 cm. long; heads densely clustered; involucres very woolly 

 at base, cylindric in the pistillate heads, 8 mm. long, in the staminate shorter; 

 bracts pink, rarely white, acute in the pistillate, obtuse in the staminate heads; 

 akenes glandular. Spokane County. 



Antennaria pulcherrima (Hook.) Greene. Loosely white-woolly throughout; 

 stems erect, 30-50 cm. high, without stolons; lower leaves oblanceolate, 

 acute, 10-15 cm. long; cauline linear-lanceolate, smaller; heads 6-8 mm. 

 high, cymose, in a rather dense cluster; involucres very woolly at base; bracts 

 brownish with white scarious tips, obtuse or in the pistillate heads often acu- 

 tish; pappus-bristles of the staminate flowers abruptly dilated at the tips. 

 In moist ground. 



Antennaria luzuloides T. & G. Tufted, 10-40 cm. high, silvery through- 

 out and closely woolly; leaves numerous, linear or linear-lanceolate, acute, 

 the lowest petioled, the upper sessile, 2-10 cm. long; heads numerous, in 

 corymbs, yellowish-white; staminate subglobose, 4 mm. high, the inner in- 

 volucral bracts obtuse, with ivory-white papery tips; pappus with much dilated 



