Pluchea. COMPOSITE. 225 



stramineous. Syn. ii. 425; Hook. & Arn. Bot. Beech, i. 31 (Molina riscosa, Ruiz & Pav. 

 Syst. 207). B. ylutinosa, B. ccerulescens, & B. Alamani, DC. Prodr. 1. c. 402, 403. B. Pingroea, 

 Nutt. Trans. Am. Phil. Soc. 1. c. 337, excl. syn. B. ghitinosa & B. ctzrulesc.ens, Gray, Bot. 

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

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

 (Mex. to Chili.) 



B. vinainea, DC. Stems truly shrubby, 6 to 12 feet high, producing short lateral flowering 

 branches, 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 the flowering shoots : 

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

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

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

 early spring ; the foliage persisting all winter. 



TEIBE IV. INULOIDE^E, p. 57. 



52. PLtTCHEA, Cass. (For the Abbe N. A. Pluche, an amateur natu- 

 ralist of the latter part of the eighteenth century.) - - Warm-temperate or tropical 

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

 purple flowers, cymosely or paniculately disposed or rarely solitary at the sum- 

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

 Benth. & Hook. Gen. ii. 21)0. 



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

 flowers of more rigid bristles 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. (CACHIMILLA, ARROW-WOOD.) Shrub several feet high, much 

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

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

 ends: involucre campanulate; its outer bracts ovate, obtuse, tomeiitose: 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 Eep. (Notes of Beconnoissance, 1848) 143; & Sitgreaves Rep. 162, t. 5; Gray, PL 

 Feudl. 75, PI. Wright, i. 102 ( Phalacrocline) , & Bot. Calif., i. 334. Poli/pappus sericeus, 

 Nutt. PI. Gamb. 178. Saudy banks of streams, from the Rio Grande on the western borders 

 of Texas to S. California : fl. summer. 



2. STYLIMNUS. 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 & Gyncma, Kaf. m 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 bifrons was founded by Linnanis 

 on European Inula:, 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 



