334 COMPOSIT.E. Pluchea. 



Tribe IV. INULOIDE.^. 



Heads lieterogamoiis with the marginal or outer flowers pistillate (in the true 

 Imdece radiate in the manner of Aster oidece, but there are none of these in Cali- 

 fornia), or in our genera discoid, with wholly tubular corollas, but those of pistil- 

 late flowers mostly filiform or very slender, rarely homogamous and more or less 

 dioecious. Anthers appendaged at the apex, sagittate and the auricles acuminate or 

 tailed (rarely only acute) at base. Branches of the style in perfect flowers margined 

 with stigmatic lines up to the very apex, not tipped with an appendage : sterile 

 flowers commonly with undivided style. Akenes small, except in Adenocaulon. 

 Leaves alternate, except in Psilocarjihus. Flowers in the head all of one color. 



26. PLUCHEA, Cass. 



Head discoid, many-flowered, most of the flowers pistillate and with minutely 

 2 _ 4-toothed corolla, a few hermaphrodite but sterile flowers in the centre with a 

 tubular 5-lobed corolla. Scales of the involucre regularly imbricated, thin and dry 

 (purplish), oppressed, ovate or lanceolate. Eeceptacle flat, naked. Style of the 

 hprmaphrodite flowers minutely 2-toothed or undivided. Akenes small, 4-5-an- 

 gled. Pappus uniform, a single series of fine capillary bristles. — Mostly glandular- 

 pubescent, with aromatic or hea\'y odor ; the small heads in corymbose cymes, the 

 flowers whitish or puri)le. 



1. P. camphorata, DC. Annual herb, a foot or two high, with minute some- 

 what viscid iiuhcscence : leaves oblong-ovate varying to broadly lanceolate, irregu- 

 larly more or less toothed, nearly sessile, somewhat succulent : cyme corymbose, 

 dense : involucre tinged with purple, miimtely viscid-pubescent. — Torr. & Gray, 

 Fl. ii. 261. 



Salt marshes, Bay of San Francisco (Pickering and Brackenridge, Bolanclcr) ; San Diego, Palmer. 

 Nevada and Arizona ; also eastward along the whole Atlantic coast of the United States. 



27. TESSARIA, Ruiz & Pavon. 



Head and flowers like those of Pluchea ; but scales of the involucre of firm tex- 

 ture ; the outer even coriaceous, broad and short, the innermost narrow and some- 

 what scarious. Pappus of the central flowers (in our species) of firmer bristles with 

 abruptly dilated tips. — Silky canescent shrubby plants, with cymose or corymbose 

 rather small heads of purplish flowers : all Western South American, except the fol- 

 lowing. 



1. T. borealis, Torr. & Gray. Shrub, with virgate branches, very leafy to the 

 top: leaves lanceolate, very acute, entire, sessile, silvery-canescent : heads in a small 

 sessile cluster terminating the branches : involucre broadly campanulate ; its outer 

 scales tomentose and ovate, the inner linear and scarious-finibriate at the tip : recep- 

 tacle not hairy : hermaphrodite flowers 6 to 8 : the bristles of their pajipus more 

 rigid and with conspicuously enlarged tips. — Emory, Rep. 143; PI. Fendl. it PI. 

 AV right. ; Sitgreaves, Eep. t. 5. Polyjxtjrpus sericeus, Nutt. PL Gamb. 



Sandy borders of streams, from Ventura Co. (Rothrock) and southeastward {Coulter, Palmer) 

 through Arizona and New Mexico. Called Cachimilla by the Mexicans, Arrowwood by trav- 

 ellers. 



