COMPOSITAE (COMPOSITE FAMILY) 537 



18. Antennaria luzuloides T. & G. Fl. 2: 430. 1842. "Closely silky-woolly; 

 stems slender, 2-3 dm. high: leaves all narrowly linear or some of the lowest 

 narrowly lanceolate-spatulate; the small uppermost linear-subulate: heads 

 small, 4-5 mm. long, several or numerous; involucre glabrous nearly or quite 

 to the base; the inner bracts in the pistillate heads obtuse: achenes glandular; 

 the spatulate and as it were petaloid tips of the staminate pappus obtuse." 

 British Columbia to Oregon and Wyoming. 



19. Antennaria pulcherrima (Hook.) Greene, Pitt. 3: 176. 1898. Stems sim- 

 ple, not surculose, 3-4 dm. high, stout: basal leaves oblanceolate, 10-15 cm. 

 long, acute, more or less distinctly 3-nerved, loosely tomentose; stem leaves 

 lance-linear, acute, the upper ones small: heads 6-8 mm. high, almost hemi- 

 spheric, tomentose at the base; the bracts in 3-4 series, brown or with scarious 

 tips, in the sterile head obtuse or truncate, in the fertile obtuse or acutish: 

 pappus (staminate) moderately dilated above. (A, anaphaloides Rydb. Mem. 

 N. Y. Bot. Card. 1: 409. 1900.) Colorado to Montana and far northward. 



20. Antennaria oblanceolata Rydb. Mem. N. Y. Bot. Card. 1: 409. 1900. 

 Stems simple, from a branching caudex, 10-25 cm. high, slender: basal leaves 

 oblanceolate or spatulate, white silky-tomentose, mucronate, 3-nerved, 3-5 cm. 

 long; stem leaves similar, narrower, reduced: heads in a small corymb, small, 

 4-5 mm. high; involucre tomentose only at the base; the bracts otherwise 

 glabrous, brownish, only the inner ones with a white tip, in the sterile obtuse, 

 in the fertile acutish: pappus (staminate) much dilated at the end. Colorado 

 to Montana, British Columbia, and California. 



21. Antennaria dimorpha (Nutt.) T. & G. 1. c. 430. Depressed, caespitose, 

 forming dense matted tufts 2-5 cm. high; the thickish rootstocks creeping; 

 stems very leafy: leaves spatulate, attenuate below to a petiole, 10-20 mm. 

 long, whitish-tomentose both sides: heads solitary, 6-8 mm. high; bracts of 

 the involucre well imbricated, the outer successively shorter and obtuse, the 

 inner acute or acuminate; those of the fertile heads narrow, with hyaline 

 acuminate tips: achenes oblong, pubescent; pappus of the fertile flowers 

 copious, of soft and very slender bristles that are not at all thickened upward. 

 Dry plains; Colorado, far northward and westward. 



33. ANAPHALIS DC. PEARLY EVERLASTING 



White-tomentose, woolly perennial herbs with leafy erect stems, entire 

 leaves, and numerous small discoid heads of yellow disk-flowers. Heads dioe- 

 cious but usually with a few hermaphrodite flowers in the center of the pistil- 

 late heads. Bristles of the pappus of the staminate flowers but little if at all 

 thickened at the apex; those of the pistillate flowers not united at base but 

 falling separately. 



1. Anaphalis subalpina (Gray) Rydb. Mem. N. Y. Bot. Card. 1: 415. 

 1900. Commonly 3-5 dm. high, in tufts, very leafy, the white floccose wool 

 rarely becoming tawny: leaves 5-10 cm. long, rather broadly to linear- 

 lanceolate, green above, the broader ones indistinctly 3-nerved : heads numer- 

 ous, corymbosely cymose; bracts of the involucre very numerous, almost 

 wholly pearly white, radiating in age. Anaphalis margaritacea, as to our range. 

 In the mountains of our range and westward. 



34. NACREA A. Nels. 



Perennial from horizontal rootstocks. Stems stoutish, erect, permanently 

 lanate as are also the leaves. Heads discoid, congested in a cymose corymb; 

 involucral bracts thin, pearly white, pluriserially imbricated. Flowers all 

 hermaphrodite. Corolla inserted below the summit of the achene which pro- 

 jects into the tube of the corolla as a short, cylindrical base supporting the 

 style. Receptacle plane, alveolate. Pappus-bristles capillary, thickened at 

 the apex. Achene constricted at the point where the corolla is inserted, basal 

 portion obconical. 



