THISTLE FAMILY 921 



41. A. dimorpha (Nutt.) T. & G. Pulvinate-cespitose perennial; stem 1-3 

 dm. high; leaves 1-2 cm. long; heads solitary; involucres of pistillate heads 1-1.5 

 cm. high, turbinate, tomentose at the base only; outer bracts ovate, acute, the 

 inner narrowly linear-lanceolate, attenuate; involucre of the staminate heads 

 more hemispheric, 6-7 mm. high; bracts oblong, obtuse, darker brown. Dry 

 plains: Mont. Neb. Colo. Calif. B.C. Plain Submont. Ap-Jl. 



42. A. macrocephala (D. C. Eat.) Rydb. Pulvinate-cespitose perennial; 

 stem 2-5 cm. high; leaves 1.5-3 cm. long; involucres of the pistillate heads tur- 

 binate, 18-20 mm. high; outer bracts ovate, the inner narrowly linear-lanceolate, 

 scarious-margined, brownish on the back; involucres of the staminate heads 

 about 8 mm. high; bracts elliptic to ovate, often acutish. A. dimorpha macro- 

 cephala D. C. Eat. Bench-lands: Utah. Son. Submont. Ap My. 



43. A. flagellaris (T. & G.) A. Gray. Pulvinate perennial with a small 

 caudex, producing filiform ascending stolons, 510 cm. long, which bear at their 

 apex a rosette of small leaves; basal leaves narrowly linear, grayish-tomentose ; 

 stem 1-2 cm. long, few-leaved; heads solitary; involucres of the staminate heads 

 6-7 mm. high, tomentose at the base; bracts dark brown, oblong-obtuse; involucre 

 of the pistillate heads 8-10 mm. long; bracts lanceolate to linear-lanceolate, acute. 

 Mountains: n Wyo. Wash. Ore. Submont. Subalp. Je-Jl. 



56. ANAPHALIS DC. PEARLY EVERLASTING. 



Tomentose, perennial, caulescent herbs with rootstocks. Leaves alternate, 

 narrow, sessile. Heads discoid, polygamo-dioecious. Involucres hemispheric; 

 bracts imbricate in several series, pearly-white; receptacle convex, not chaffy. 

 Pistillate heads usually with a few hermaphrodite flowers in the center. Pistil- 

 late corollas filiform, their pistils with distinct style-branches. Hermaphrodite 

 flowers with tubular, 5-toothed corollas, and undivided styles, sterile. Pappus- 

 bristles capillary, falling off separately. [Nacrea A. Nels., based on a stam- 

 inate plant.] 



Leaves narrowly linear, 1-nerved; heads about 5 mm. high. 1. A. angustifolia. 



Leaves linear-lanceolate to oblong-lanceolate, 3-nerved; heads 6-7 mm. high. 



Leaves comparatively thin, less tomentose above. 2. A. subalpina. 



Leaves comparatively thick, almost equally white-tomentose on both sides. 



3. A. lanata. 



1. A. angustifolia Rydb. Stem slender, strict, 3-6 dm. high; leaves 5-10 

 cm. long, 2-5 mm. wide, densely white-tomentose beneath, less so above, glabrate 

 in age; inflorescence small, corymbose; bracts elliptic, obtuse or acutish. Wooded 

 slopes: Mont. B.C. Submont. Jl-Au. 



2. A. subalpina (A. Gray) Rydb. Stem 3-4 dm. high; leaves 3-8 cm. long, 

 5-15 mm. wide, densely white-tomentose beneath; inflorescence corymbiform; 

 bracts pearly-white, broadly ovate, mostly acute. A. margaritacea subalpina A. 

 Gray. Open mountain woods: Alta. S.D. Colo. Utah B.C. Submont. 

 Subalp. Je-Au. 



3. A. lanata (A. Nels.) Rydb. Stem strict, 2-4 dm. high; leaves densely 

 lanate on both sides, ascending, sessile and clasping, oblong-lanceolate, 4r-6 cm. 

 long, 10-15 mm. wide, mucronate; inflorescence corymbiform, high; bracts pearly 

 white, ovate or obovate, obtuse or acutish. Nacrea lanata A. Nels. Mountains: 

 Wyo. Mont. Jl-S. 



57. GNAPHALIUM L. CUDWEED, EVERLASTING. 



Annual, biennial, or perennial caulescent herbs, with woolly or sometimes 

 glandular foliage. Leaves alternate, entire, narrow. Heads discoid, glomerate 

 or paniculate in our species. Involucres campanulate or hemispheric; bracts 

 scarious, imbricate in several series; receptacle not chaffy, usually pitted. Mar- 

 ginal flowers pistillate, fertile, in several series, with filiform corollas. Central 

 flowers hermaphrodite, few, with tubular- corollas. Pistils in all the flowers with 

 2 distinct stigmas. Anther sagittate at the base. Achenes terete or slightly 

 flattened. Pappus of capillary bristles, distinct or united at the base, deciduous. 



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