Pluchea. C0MP0SITJ5. 225 



stramineous. — Syn. ii. 425; Hook. & Am. Bot. Beech, i. 31 [Molina viscosa, Ruiz & Pav. 

 kSjst. 207). B. (jlnti)iosa, B. aeridescens, & B. Alamani, DC. Prodr. 1. c. 402, 403. B. Pingrcea, 

 Niitt. Traus. Am. Phil. Soc. 1. c. 337, excl. syn. B glutinosa & B. aerulescens', Gray, Bot. 

 Calif, i. 333. — Along streams and in moist ground, S. California, from Los Angeles south- 

 ward, and througli Arizona to S. Colorado and the borders of Texas : fl. late in autumn. 

 (Mex. to Chili.) 

 B. viminea, DC. Stems truly slirubby, 6 to 12 feet high, producing short lateral flowering 

 brandies, these terete and minutely' striate : leaves lanceolate, entire or some sparingly den- 

 ticulate, obscurely 3-uerved, 2 or 3 inches long, or much smaller on tlie flowering shoots : 

 heads usually 4 lines long, hemisplierical, in small cymose clusters terminating numerous 

 lateral branciilets : involucre tawny. — Prodr. v. 400 ; Gray, Bot. Calif, i. 333. — Along 

 streams, California, from Monterey southward and to San Bernardino Co. : flowering in 

 early spring ; tlie foliage persisting all winter. 



Tribe IV. INULOIDEiE, p. 5T. 



52. PLtrCHEA, Cass. (For the Abbe TV. A. Fluche, an amateur natu- 

 ralist of the hitter part of the eighteenth century.) — AVarm-temperate or tropical 

 pLants ; with alternate pinnately veined leaves, and heads of flesh-colored or dull 

 purple flowers, cymosely or paniculately disi:)osed or rarely solitary at the sum- 

 mit of the stem or branches. — Cass. Bull. Philom. 1817, & Diet. Sci. Nat. xlii.; 

 Benth. & Hook. Gen. ii. 290. 



§ 1. Berthelotia. Pappus of the hermaphrodite-sterile (or rarely fertile) 

 flowers of more rigid bi'istles with clavellate-dilated tips : involucre chartaceo- 

 coriaceous ; the innermost narrowly linear and deciduous with the flowers. Very 

 leafy sericeous-canescent shrubs. — Gray? Proc. Am. Acad. xvii. 212. Berthelotia, 

 DC. Prodr. v. 375. 



P. borealis, Gray, I.e. (Caciiimit.la, Arrow-wood.) Slirub several feet high, much 

 branched, willow-like, very leafy up to the cymulose-glomerate heads, silvery with tlie very 

 close and fine appressed pubescence : leaves entire, linear-lanceolate, .sessile, acute at both 

 ends : involucre campanulate ; its outer bracts ovate, obtuse, tomentose : bristles of the 

 pappus of the central flowers little stouter than of the others, but with abruptly enlarged 

 tips, not united at base : style of the same entire. — Tessaria borealis, Torr. & Gray, in 

 Emory Rep. (Notes of Reconnoissance, 1848) 143; & Sitgreaves Rep. 162, t. 5; Gray, PL 

 Fendl. 7.5, PI. Wright, i. 102 (§ Plidlucrocline), & Bot. Calif, i. 334. Poli/pappus sericeus, 

 Nutt. PI. Gamb. 178. — Sandy banks of streams, from tlie Rio Grande on tlie western borders 

 of Texas to S. California: fl. summer, j^^ /f^^7 , . ' 



§ 2. SxYLiMxrs. Pappus of both kinds of flowers fine and similar, more or 

 less soft, none of the bristles at all thickened at tip : bracts of the involucre 

 thin or thinnish : corolla of the hermaphrodite flowers somewhat enlarged 

 upward : heavy-scented herbs, or in the tropics shrubby, somewhat pubescent 

 and glandular, with membranaceous or slightly succulent pinnately-veiny leaves, 

 commonly with some callous-mucronate teeth : heads cymose-clustered : flowers 

 dull purple, in late summer or autumn. — Stylimnus & Gynema, Raf. in Jour. 

 Phys. 1819, & Ann. Nat. 1820, 15. Leptogyne, Ell. Sk. ii. 322, as subgenus. 

 Pluchea {Stylimnus) § 3, DC. Prodr. v. 451. 



The first of the following species may fairly retain the now established name, 

 rather than have a new one made ; but Conyza hifrons was founded by Linnaeus 

 on European Inul<B, viz. on Hermann's figure, which in ed. 2 he refers to that 

 genus, and on one of Plukenet's (mistaken for Canadian), which is certainly 

 /. bifrons, as his herbarium shows. Of the many names for our second species, 



15 



