130 COMPOSITiE. Aplopappus. 



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

 10 or 12. — PI. Fendl. 76. — Low prairies, near Hou.stou, Texas, Wriyht. Not since 

 collected. 

 A. rubiginosus, Torr. & Gray. Annual, 1 to 3 feet liigh, viscid-glandular and pubescent 

 or puherulent : leaves lanceolate or narrowly oblong, iucisely pinnatifid or dentate with salient 

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

 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. by Druuiinond. 



Var. pliyllocephalus. 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. phjJlocephalns, UC. Prodr. v. 347; Gray, Bot. Mex. Bound. 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. Plorida. (Adj. Mex. Berlandier.) 



++ ++ Akeiies compressed, obscurely striate at maturity: style-appendafjes lanceolate, rather hjnir: 

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

 leaves 1-2-pinnatifid. 



A. gracilis, Gray. Annual or becoming lignescent at base and more enduring, canescently 

 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, tijiped 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. — PI. Fendl. 76, & Bot. Calif, i. 613. DhUria {Sideninlhus) (/ra- 

 cilis, Nutt. PL Gamb. 177. — Plains, W. Texas to S. Utah, Arizona, and the southeru border 

 of California ; first coll. by Gambtl. 



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

 a span to a ft)ot higli, commonly spreading, cymosely branched at summit : leaves broader 

 in outline than the preceding, pinnately and the lower often bipinuately parted into ratlier 

 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. Amtl- 

 lus? spinulosus, Pursh, Fl. ii. 564. Starkea? pinnata, Nutt. Gen. ii. 169. Diplopappus 

 jiinnatijidus, Hook. Fl. ii. 22. Dietevia spinulosa, Nutt. Trans. Am. Phil. Soc. 1. c. 301. — 

 Plains from Saskatcliewan to Texas, and west to Dakota, Colorado, and Arizona. Varies in 

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

 form. (Mex.) 

 A. arenAriiis, Benth. Bot. Sulph., from Cape Lucas, Lower Califoruia, may have hetero- 



diromous heads, and be an Aster. 



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

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

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

 25 ; their corolla sli2;htly ampliate upward, 5-toothed : style-appendages linear- 

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

 canescent : pappus ferruginous, of rather scanty fine 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 Chrijsopsis 

 (jraiiiiiiifolia, 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: in- 

 volucral bracts subulate-attenuate. — Proc. Am. Acad, xviii. 102. hopappus divaricatus, 

 Torr. & Gray, Fl. ii. 239. Chrj/sopsis {Inula) divaricata, Nutt. Gen. ii. 152. C. Lamarckii, 

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



