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 ihm. 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. Gard. 1: 409. 1900.) Colorado to Montana and far northward. 



20. Antennaria oblanceolata Rydb. Mem. N. Y. Bot. Gard. 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. Gard. 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. A naphalis 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. 



