502 COMPOSITAE (COMPOSITE FAMILY) 



few, loose, somewhat in 2 series, nearly equal, linear-lanceolate, 1-nerved; 

 the exterior mostly with foliaceous spreading tips, commonly with 1 or more 

 foliaceous bracts at the base resembling the upper leaves. Receptacle flat, 

 alveolate. Branches of the style much exserted, the appendages elongated, 

 subulate, hirsute, much longer than the flat stigmatic portion. Achenes large, 

 much compressed. Pappus of copious somewhat unequal scabrous capillary 

 bristles. Aplopappus in part. 



Heads radiate. 



Leaves obovate; heads several . . . . . . . 1. M. obovatum. 



Leaves spatulate; heads solitary . . . . . . . 2. M. grindelioides. 



Heads discoid. 



Leaves qblanceolate; heads solitary 3. M. discoideum. 



Leaves linear; heads several . . . . . . . 4. M. lineare. 



1. Macronema obovatum Rydb. Bull. Torr. Bot. Club 27: 618. 1900. 

 Glandular-puberulent, 2-3 dm. high, with light yellow bark on the branches: 

 leaves broadly obovate, 1-2 cm. long, 7-10 mm. wide, mucronate-cuspidate : 

 heads usually 2-3 together, about 10 mm. high, and 8 mm. broad; the bracts 

 rather firm, oblong-linear, abruptly obcuneate-acute at the apex, unequal, 

 imbricated in about 4 series: rays short, 4-5 mm. long, about 10 in number. 

 Known only from type locality, City Creek Caflon, Utah. 



2. Macronema grindelioides Rydb. Mem. N. Y. Bot. Gard. 1: 384. 1900. 

 A much-branched undershrub, 1-2 dm. high; young branches glandular- 

 puberulent: leaves oblong or spatulate, more or less fleshy, 1-2 cm. long, ob- 

 tuse or mucronate, finely glandular-puberulent, and with a more or less crisped 

 margin: heads 1-5 cm. high; the bracts rather few, the outer ones foliaceous, 

 oblanceolate, acute, mostly longer than the disk: rays 6-12, rather conspic- 

 uous, often 1 cm. long. High mountain peaks; northern Wyoming to Mon- 

 tana and Idaho. 



3. Macronema discoideum Nutt. Trans. Am. Phil. Soc. II. 7: 322. 1841. 

 Branches erect from a woody base, 1.5-2.5 dm. high, terete, white-tomentose : 

 leaves spatulate-oblong, obtuse, apiculate, 15-25 mm. long, obscurely 3- 

 nerved, minutely glandular and scabrous: heads single or few in a corymb, 

 turbinate ; bracts of the involucre few, subequal, broadly lanceolate, glandular, 

 the outer ones more or less herbaceous: heads about 25-flowered: rays none: 

 branches of the style very long, filiform, much exserted, the hispid portion 

 twice as long as the stigmatic: achenes pubescent. Mountains of Colorado, 

 Wyoming (?), and westward. 



4. Macronema lineare Rydb. 1. c. With the habit and appearance of some 

 Chrysothamni; stem erect, about 1.5 dm. high, finely white-tomentose: leaves 

 numerous, linear, acute, glandular-puberulent, bright green: heads 1-1.5 cm. 

 high; the bracts rather few, linear, somewhat foliaceous, but seldom equaling 

 the disk: rays none. Yellowstone Park and adjacent Wyoming. 



4a. Macronema lineare canescens A. Nels. Leaves 2-3 cm. long, acute, 

 lightly canescent and nearly or quite destitute of resinous atoms: involucral 

 bracts very finely lanate. Same range. 



15. STENOTUS Nutt. 



Dwarf herbaceous plants with linear or lanceolate, 1-3-nerved, rigid, entire, 

 alternate or crowded leaves and middle-sized heads of yellow flowers. In- 

 volucre hemispherical; the bracts oblong-ovate to orbicular, 1-nerved, mem- 

 branaceous with scarious margins, of equal or moderately unequal length, 

 closely appressed and imbricated. Heads many-flowered, radiate. Rays 

 8-12, pistillate; disk-corollas perfect, dilated toward the summit, deeply 

 5-toothed. Style branches broad and flat. Achenes oblong-turbinate, densely 

 silky-villous. Pappus commonly bright white, of numerous soft, unequal, 

 densely scabrous capillary bristles. Aplopappus in part. 



1 .sc; leaves linear, crowded on the crowns; stems scapose. 



Scabrous-pubescent . . . 1. S. acaulis. 



Glabrous 2. S. caespitosus. 



