130 COMPOSITE. Aplopappus. 



ovate green tips, the longer innermost nearly scarious : stronger bristles of the pappus only 

 10 or 12. I'l. Fendl. 76. Low prairies, near Houston, Texas, Wriyht. Not since 

 collected. 



A. rubiginosus, TORE. & GRAY. Annual, 1 to 3 feet high, viscid-glandular and pubescent 

 or puberuleiit : leaves lanceolate or narrowly oblong, incisely pinnatifid or dentate with salient 

 narrow teeth : heads somewhat cymosely paniculate, 5 or 6 lines high, usually uaked- 

 pedunculate : bracts of the involucre linear-subulate and with slender spreading green tips : 

 stronger bristles of the fulvous or at length .rufous pappus more numerous. Fl. ii. 240. 

 Low grounds from S. Texas to plains of Colorado up to the base of the Rocky Mountains; 

 first coll. bv Drummond. 



Var. phyllocephalus. A lower form, spreading, leafy up to the heads, which singly 

 terminate the branches, and are accordingly larger or broader, leafy-involucrate and there- 

 fore sessile, or at least some of outermost bracts loose and foliaceous, inner less imbri- 

 cated. A. phyllocephdlus, DC. Prodr. v. 347 ; Gray, Bot. Mex. Bouud. 80. Without much 

 doubt a state of A. rubiginosus (in which case a misleading name for the species) ; but may 

 hold distinct. Sea-beaches, S. Texas, also S. Florida. (Adj. Mex. Berlandier.) 



H- -H- Akenes compressed, obscurely striate at maturity: style-appendages lanceolate, rather long;: 

 rays 15 to 30: involucre of numerous small and narrow short-tipped and wholly appressed bracts : 

 leaves l-'J-phmatifid. 



A. gracilis, GRAY. Annual or becoming liguescent at base and more enduring, cauescently 

 pubescent, occasionally glabrate and glandular-scabrous: stems a span to a foot high, much 

 branched : leaves linear or the lowest spatulate, pinnatifid, or the upper few-toothed or 

 entire, tipped or also sparsely fringed with long and slender bristles : heads 4 or 5 lines 

 high : bracts of the involucre mostly setaceous-tipped : pappus rigid ; its larger bristles 

 manifestly dilated below. PL Fendl. 7G, & Bot. Calif, i. 613. Dittiria (Sidei anthus) ijru- 

 citis, Nutt. PI. Gamb. 177. Plains, W. Texas to S. Utah, Arizona, and the southern border 

 of California ; first coll. by Gainbd. 



A. spinulosus, DC. Perennial, canesceutly puberulent or tomentulose, or glabrate : stems 

 a span to a foot high, commonly spreading, cymosely branched at summit : leaves broader 

 in outline than the preceding, pinnately and the lower often biphmately parted into rather 

 numerous lobes ; lobes and teeth mucrouate-setigerous : heads and involucre of the pre- 

 ceding: pappus more capillary and soft. Prodr. v. 347 ; Torr. & Gray, Fl. ii. 240. Annl- 

 lus? s/)iiiit/vxus, Pursh, Fl. ii. 564. Starkeu? /liiu/attt, Nutt. Gen." ii. 169. Diplopa/>/>us 

 pinnatijidus, Hook. Fl. ii. 22. Dieteriu spinulosa, Nutt. Trans. Am. Phil. Soc. I.e. 301. 

 Plains from Saskatchewan to Texas, and west to Dakota, Colorado, and Arizona. Varies iu 

 Texas to nearly glabrous throughout, also sometimes with divisions of the leaves nearly fili- 

 form. (Mex.) 

 A. ARENAinrs, Benth. Bot. Sulph., from Cape Lucas, Lower California, may have hetero- 



chromous heads, and be an Aster. 



3. ISOPAPPUS, Benth. Heads small and narrow, loosely paniculate : in- 

 volucre of subulate-lanceolate bracts, destitute of distinct green tips, appressed 

 and imbricated in few ranks, the outer shorter: rays 5 to 15: disk-flowers 10 to 

 25 ; their corolla slightly ampliate upward, 5-toothed : style-appendages linear- 

 subulate, much longer than the stigmatic portion : akenes narrow, sericeous- 

 canescent : pappus ferruginous, of rather scanty line and soft bristles : annuals, 

 or sometimes more enduring, narrow-leaved. -- Isopappus, Torr. & Gray. 



A. divaricatus, GRAY. A foot or two high, with somewhat the aspect of Chrysopsis 

 ffi-uminifo/iu, more slender and effusely paniculate, scabrous-pubescent or glandular, some- 

 times glabrate: leaves rigid, linear-lanceolate or lower spatulate-lanceolate, mucronate-acute 

 or cuspidate, entire or beset with a few spinulose teeth, more or less setose-ciliate toward 

 the base ; the upper small and subulate and in the diffuse naked usually polycephalous 

 panicle minute : heads 3 or 4 lines high : peduncles sometimes filiform, sometimes short: iu- 

 volucral bracts subulate-attenuate. Proc. Am. Acad. xviii. 102. /.so/>r//>/ws dioaricatus, 

 Torr. & Gray, Fl. ii. 239. Chrysopsis (fnula) ilirttn'cuUi, Nutt. Gen. ii. 152. (.'. Lamarchii, 

 Nutt. in Trans. Am. Phil. Soc. 1. c. 315. Heterotheca Lamarckii, DC. Prodr. v. 317, as to 



