130 COMPOSITE. Aplopappus. 



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

 10 or 12. — PI. Fendl. 76. — Low prairies, near Houston, Texas, Wright. Not since 

 collected. 

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

 or puberulent : leaves lanceolate or narrowly oblong, incisely 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 Eocky Mountains ; 

 first coll. by 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. phyllocephalus, DC. 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. Florida. (Adj. Mex. Berlandier.) 



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

 rays 15 to 30 : involucre of numerous small and narrow short-tipped aud 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, 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. 76, & Bot. Calif, i. 613. Dieteria (Sideranthus) gra- 

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

 of California ; first coll. by Gambet. 



A. spinuloSUS, DC. Perennial, canescently 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 bipinnately parted into rather 

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

 ceding: pappus more capillary and soft. — Prodr. v. 347 ; Torr. & Gray, El. ii. 240. Amel- 

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

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

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

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

 form. (Mex.) 

 A. arenArius, 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 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 Chrysopsis 

 graminifolia, 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. Isopappus dioaricatus 

 Torr. & Gray, Fl. ii. 239. Chrysopsis (Inula) divaricata, Nutt. Gen. ii. 152. U. Lamarclcii 

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



