^34: COMrurilT.K. I'lmMea. 



Triuj.: IV. INIIl.OIDErE. 



Heads heterogaiuous with tlic inargiiial or outer flowers pistillate (in the true 

 Inuleoe radiate in the manner of Asttroide(e, 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 liliform or very slender, rarely homoganious and more or less 

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

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

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

 flowers comuionly with undividtul style. Akones small, excejjt in Adenocauluu. 

 Leaves alternate, except in Psilocarphas. JHowers 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), appressed, ovate or lanceolate. Receptacle flat, naked. Stylo of the 

 hermaphrodite 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 heavy odor ; the small heads in corymbose cymes, the 

 flowei-s whitish or purple. 



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

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

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

 <l(>nso : involucre tinged with purj)lo, minutely viscid-pubescent. — Torr.it (^ray, 

 ¥\. ii. 2GI. 



Salt marshes, Bay of San Francisco {Pickering ami Brackenridge, Bohindcr) ; San Diego, Palmer. 

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



27. TESSARIA, Kuiz & 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 flrmer bristles with 

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

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

 lowing. 



1. T. borealis, Torr. &, Gray. Shrub, with virgato branches, very leafy to thti 

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

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

 scales tomentose and ovale, the inner linear and scarious-flmbriate at the tip : recep- 

 tacle not hairy : hermaphrodite flowers G to 8 : the bristles of their pappus niore 

 rigid and with conspicuously enlarged tijis. — ]joory. Rep. 143; PI. Fendl. &, PI. 

 "Wright.; Sitgreaves, Rep. t. 5. Poiypajijms sericeus, Nutt. PI. Gamb. 



Sandy borders of streams, from Vctntina Co. (Uothruck) and southeastward (Coulter, Palmer) 

 through Arizona and New Mexico. Called Cuc/dmillu by the Alexicans, Arrowwood by trav- 

 ellers. 



