Blepharipappus. COMPOSITE. 35^ 



63. BIDENS, Linn. Run-MARinoM,. 

 Head many-flowered heteroga„.ous and the 3 to 10 mys neutral, or homogaraous 

 and the flowers all perfect and tubular. Involucre double; the outer of a few mostly 

 fohaceous loose or spreading scales; the inner of several erect and more membn^na 

 ceous scales. Receptacle flat or convex ; the thin narrow chaff deciduous with the 

 fruit. Akenes obcompresse.l, either broad and very flat or narrow, beakless, bearinjr 

 a pappus of 2 to 4 rigid and retrorsely barbed awns. _ Annual or perennial herbs 

 wdh opposite leaves, and small or middle-sized heads of yellow or sometimes white 

 flowers; some of them vile weeds. The species are numerous, and very widely 

 distributed over the world, but there are remarkably i... in California or in the 

 J acilic region. 



* Akenes broad : leaves merely serrate. 



two'hS.''^l'^^^f^®'?°'f ®^' ^,^'''^^- ^""""^' ^^"^^°"^' ^«^fy to the top, a foot or 

 3 to 5 there r''^ ^"T'Y'^ tapering to both ends, clo.sely sessii;, serrate 

 ravs fi n ^0 ?; l^e^'lf/'-^ther large and showy: scales of inner involuci; broad 

 rays 8 to 10, golden yellow, oblong or oval, an inch long : akenes wed.rc-shaped • 



S^xedZstleT ' '° ' "''" ^°"^ ^""^ '^^''^'^ ^^'"^ ^'8id or almost p^S; 



JS^:^2.T7ti^.:^;:i^z^ *'^ ^^^^^"^ ^^^ ^'^ *^^ «^^- ^^*-^^ ^^ ^^--. 



raves' or'^wX^hoironp", of I'Tf '^'^ n ^^''^h,g™^« *" Oregon, has smaller leaves, heads without 

 E r, n oieft T^ ofbghter ye low, and smaller Imrbs to the akene antl awns. The two per- 



Vo';ge:^:T±bly Ui: Setlin^r "'"" ' "'''"■ '^"^ ^"■"°"' " ''''■ ^"'^"■^' ^'' '''"^''^'^ 



* * Akenes long and narroto {Spanish Needles) : leaves divided or compound. 



2. B. pilosa, Linn. Annual, more or less hairy, or merely the leaves sparselv 



^rr7:Tw *--fi-t-l-the Wr 5-parted into ovate inLely cleft or sCply 



serrate thin leaflets: heads small, without rays or with 2 or .3 small and whit^h 



ones: akenes linear, smooth, or the outer ones upwardly hispid-scabrous at lelst 



Or? Fl if .3M "''^' 2-^-'^^^"'^^^- -^^- C-i^for^^ca, DC Pmllr. v. SOo! Torr & 



Santa Barbam to Los Angeles, near water-cour.ses, kc. A weed widelv difTnoed nvr>r tl,« 



le^nrSi^X^S^XSlf "'^' vesemblesa.,... with finely di^ded 

 54. BLEPHARIPAPPUS, Hook., Torr. k Gray. 



Head heterogamous, with 3 to G pistillate rays : di.^k-flowers 7 to 12 perfect, some 

 of the central infertilo. Scales of the involucre fi to 10, nearly in a flinglo scricvs 

 lanceolate, erect, almost equal. Keceptaclo convex, chafly ; the chafl" thin and 

 membranaceous, deciduous with the fruit. Rays short and broad, cuneiform, 3- 

 lobed. Style in the rlisk-flowers long, thickened upwards and hairy, 2-cleft only at 

 the apex (the branches obtuse and not appendaged). or in the central and sterile 

 flowers nearly entire. Akenes turbinate, silky-villous. Pappus of 10 or 12 linear 

 hyaline scales, traversed by a stout awn like midrib, the margins lacerately fringed 

 so as to appear plumose, rarely wanting. —Annual, corymbosely or paniculately 

 branched ; both rays and disk-corollas whitp ; tho anthers brown-purple. Only 

 one variable species. 



