488 coMPOsiTAE (composite family) 



1. Liatris punctata Hook. Fl. Bor. Am. 1 : 306. 1833. Stems 1-7 dm. high 

 from a thick and branching or sometimes globular stock, stout: leaves all 

 narrowly linear, commonly punctate, rigid: heads oblong or cylindraceous, 

 thickish, 12-18 mm. long, mostly numerous and crowded in a dense spike: 

 bracts of the involucre punctate, oblong, abruptly or sometimes more gradu- 

 ally cuspidate-acuminate, often lanuginous-ciliate. — On the plains; from the 

 Saskatchewan to Montana and southward to Texas and New Mexico. 



2. Liatris ligulistylis A. Nels. From an enlarged woody, tuberous root; 

 stems single, 4-5 dm. high, leafy: leaves bright green, rather obscurely punc- 

 tate, glabrous; the lower lance-oblong, 8-12 cm. long, tapering into a shorter 

 margined petiole; upwardly becoming more lanceolate, gradually smaller, 

 passing into the lance-linear bracts: heads few to several, in a short raceme; 

 peduncles 1-3 cm. long: involucre broadly campanulate, often 20-25 mm. 

 broad; bracts in about 6 series, foUar-green, with dark purple, scarious, 

 laciniate-erose margins; the outer shorter, nearly orbicular to oval; the mid- 

 dle rows broadly obovate; the inner elUptic or oblong and 15-18 mm.long: 

 flowers 50-70, purple: exserted style branches conspicuous, flattened, as 

 long as the corolla, fight purple. L. scariosa. (Ladniaria ligulistylis A. Nels. 

 Bot. Gaz. 31: 405. 1901.) — Bottom lands; Colorado, through Wyoming to the 

 Dakotas. 



6. GUTIERREZIA Lag. 



Low suffrutescent or herbaceous plants with nearly glabrous but resinous 

 herbage. Leaves narrowly linear, entire, alternate. Heads radiate, very 

 small, numerous, cymose or paniculate at the summit of the stems; flowers 

 yellow. Involucre imbricated; the bracts coriaceous, with green tips. Re- 

 ceptacle in our species flat. Achenes angled or striate, pubescent. Pappus of 

 4-15 oblong or narrower commonly erose scales. 



Disk- and ray-flowers each 3-10 in each head. 



Kesihous dots large, bordered by a hyaline scale . . , . 1, G, lepidota. 

 Resinous dots small, not. bordered. 



Shrubby, at least a p^rjb of the main branches persisting . , 2, G. longifoUa. 

 . Only the base woody and persisting. 



Involucres turbinate: rays &-6, disk-flowers 8-10 . , , 3. G. diversifolia. 

 Involucres clavate-oblong; rays 3-5, disk-flowers 4-7 . . 4. G, Sarothrae. 

 Disk- and ray-flowers each only 1-2 in each head' . , . .6. G. microcephala. 



1. Gutierrezia lepidota Greene, Pitt. 4: 57. 1899. Loosely tufted on a 

 woody base, the leaf y and floriferous stems 3-5 dm. high, smooth and glabrous, 

 the rather large heads loosely cymose-panicled: lower leaves narrowly ob- 

 lanceolate, obtuse, the upper successively narrower and those imder the 

 panicle linear, all ascending, only their margins scabrous, the surface marked 

 with large dots each bordered with a hyaline scale, otherwise glabrous: the 

 very distinctly turbinate involucres about 6 mm. nigh; the bracts in about 

 4 series, all with thick, blimt, green tips: flowers of ray and disk each 6 or 7, 

 Ught yellow: scales of the pappus all lanceolate, acute. — Known only from 

 type number. Grand Junction, Colorado. 



2. Gutierrezia longifoUa Greene, 1. c. 54. The leafy and floriferous branches 

 3-6 dm. high; older stems terete, the newer striate and somewhat angled, 

 devoid of even a scabrous pubescence, or nearly so: leaves glabrous or pu- 

 berulent, linear, 5 cm. long or more, 1-nerved: heads sessile and glomerate 

 at the ends of fastigiate branchlets and forming a broad, nearly flat-topped 

 inflorescence: involucres elongated, obovate-turbinate, 5 mm. high; the 

 bracts long, with thick, short, green tips: flowers of ray and disk each 4 or 5: 

 pappus scales of about the Same number, mostly lanceolate, those of the ray 

 shorter. (G. linearis Rydb. Bull. Torr. Bot. Club 31: 647. 1904.)— Col- 

 orado and Utah to New Mexico. 



3. Gutierrezia diversifolia Greene, 1. c. 53. Stems 1-2 dm. high, tufted on 

 a short, stout, ligneous crown, angled and often scabrous but hardly glutinous: 

 lowest leaves somewhat oblanceolate, the short blade tapering to a long- 

 winged and hispid-ciliolate petiole; only the uppermost truly linear: inflo- 



