194 COMPOSITyE. Gutierrezia. 



3. G. divaricata : suffruticose ; stems much branched above, divaricate- 

 corymbose ; leaves very narrowly linear ; the oblong-turbinate heads nearly 

 all solitary and pedunculate ; flowers of the ray and disk each about 7 ; pap- 

 pus of 9 or 10 narrowly linear acutish chaffy scales, those of the disk longer 

 than the achenium. — •Brachyris divaricata, Nutt. ! in trans. Amer. phil. soc. 

 {n. ser.) 7. p. 313. 



On the Platte near the Rocky Mountains, with the preceding, Nuttall ! — 

 Plant with the habit of the following, and nearly the achenia and pappus of 

 G. Californica. 



§ 2. Pappus of the disk short and nearly coroniform, of the ray obsolete or 

 none. — Hemiachtris, DC. 



4. G. Texana: stem shrubby at the base, very much branched, fastigiate- 

 paniculate; the branches slender, angled ; leaves narrowly linear, 1-nerved; 

 those of the branchlets very short ; heads (small) sohtary, turbinate ; flowers 

 of the ray 5-7, of the disk 7-10 ; pappus of the ray none or obsolete ; of the 

 disk consisting of several very small ovate chafTy scales. — Hemiachyris 

 Texana, DC. ! inodr. 5. p. 314. Brachyris n. sp. Niitt. ; Torr. ! hi ann. 

 lye. New York. B. microcephala. Hook. ! ic. pi. t. 147, not oi^ DC. 



Prairies of Arkansas, Nuttall, Dr. James! Dr. Leavemvorth ! Texas, 

 Drummond ! Berlandier ! Dr. Leavenworth ! Dr. Riddell ! Aug.-Sept. — 

 Stems 1-3 feet high ; the branchlets, heads, &c., somewhat varnished. 

 Scales of the involucre lanceolate-oblong, witli scarious margins. Corolla of 

 the ray oblong. Style as in the preceding species. Achenia minutely 

 pubescent. 



Subdiv. 3. SoLiDAGiNEs:, D C. — Rays in a single series, or often none. Pappus 

 similar in the disk and ray, simple, of capillaiy or setiform, rarely squamellate or 

 awn-like bristles. 



38. BRACHYCH^TA. 



Heads 8-10-flowered ; the ray-flowers ligulate, pistillate, fertile ; those of 

 the disk tubular, perfect and fertile. Involucre cylindrical ; the scales 

 (about 12) imbricated, appressed ; the outermost short, the others oblong- 

 linear, with .somewhat greenish but scarcely herbaceous tips. Receptacle 

 narrow, naked. Ray-flowers 4-5 ; the tube of the corolla as long as the 

 oval ligule : corolla of the disk dilated above, 5-cleft ; the lobes lanceolate. 

 Branches of the style (in the disk-flowers) acute, produced above the short 

 and fiat stigmatic portion, into a deltoid-lanceolate minutely hispid acumina- 

 tion. Achenia somewhat obconic. Pappus of the disk and ray similar, 

 consisting of about 20 scabrous squamellate bristles, in a single series, shorter 

 than the achenia. — A perennial herb, with the habit of Solidago ; the stem 

 simple or sparingly paniculate at the summit. Leaves alternate, membra- 

 naceous, very veiny, ovate, acute, all but the upper somewhat cordate, 

 on margined petioles, sharply serrate ; the radical roundish. Heads small, 

 racemose-glomerate, nearly sessile; the clusters, or near the summit the 

 solitary heads, disposed in an elongated and interrupted somewhat leafless 

 unilateral raceme or spike. Flowers golden yellow. 



