41 (J (;0.\IIH)SI'1\K. Seiitciii. 



leaves vif^iil, almost uc.fini.->(^ Imt pointless, iinprcssed-pinictate: lioatl l()-lG-tloweri;(l, 

 fully Imiriin inch lonj^ ; .siiilcs of the involucro about lli in a Bingle wries, with tips 

 rdsiiiiililin^' tho ItiuvcH, and tho thinner hase Konanvhal^ dilated : akenes (oi' rutlit-r 

 ovaries) ohh)ng. — J'cKCCp/ii/lluin kScIloUH^ <^ii"ay, Hot. iMex. Hound. 7-1. 



Cdloiiiilo hottDUi la Sdiioiii (Muxicti), Sckntt, Fol>. H, 18r)f). A llowcilrsa Hiu'ciiiimi .(illrclotl 

 hy Dr. Nowbony on tlio "('nlonulo of ("aliroriiia, Jaimiiry If)," laay lio tliia ; iml is iiioir. ^'liili- 

 noua, ami is iierhaps a Bhjdovia or Aplopappus. Leaves m\. inch or less in length, punclalc in 

 the manner ol' Aplopapjius unci of many Eupaloriacecc. The flowers wcie said to be yellow, but 

 they seem to have been only yellowish. The style- branches are like those of Luina, or more 

 obtuse, and wholly destitute ol" any ainmndago or tip. 



101. SENECIO, Linn. Groundsel. 



Head many-flowered, with pistillate rays, or occasionally homogamous by tho want 

 of the rays ; the llowers all fertile. JScales of the involucre herbaceous, mostly 

 narrow, equal in a single series, or calyculato with a few short scales at the base. 

 ltecei)tacle Hat or merely convex, naki-d. l)isk-corollas usually narrow, 5-toothed 

 or 5-lobed. Style-api)endages of the disk-liowers mostly capitate-truncate, tho apex 

 nnnutely tufted or hispid, rarely with a little cusp. Akenes terete or somewhat 

 angled, usually 5- 10-ribbed. Pappus of very numerous and mostly white line and 

 soft capillary and merely scabrous bristles. — Herbs or shrubby plants ; with alter- 

 nate leaves, and usually coryndjoso or solitary heads of yellow llowers (at least in all 

 the American species) : akenes commonly glabrous, or beset with some short hairs 

 or papillae, Avhich become turgid when wetted, open at the apex, and emit one or 

 two uncoiling spiral threads. 



This is counted as the largest genus of Phfeuogamous plants (of little under 1,000 species), and 

 is very widely spread over the world, tho species of each great region for the most part peculiar. 

 Hut North America is by no means rich in species, the central regions, however, more so than 

 either tho Atlantic States or tho racilic slope. 



S. CiNKiiAiiiA, DO., of the Meditorrumian ie>j;ioii, a (ionimon ho\iflO-itlaiit (known in cultiva- 

 tion as the /)iisti/ j)/i//ri; iVom its whiti-niiMM), is in K(^llogg and Harford 8 distributed (M>llcctU)n, 

 said to have beeii gathered on the shore of the IJtiy of San Francisco, near Alameda. It is doubt- 

 less a waif from cultivation. 



S. '/ KLOCClFEKUs, DC, is Malacothvix saxatilis. 



* Root annual: rays none or minute: tveeds introduced frorn Europe into tvaste or 

 cultivated grounds. 



1. S. vulgaris, Linn. A span to a foot high, branching, leafy to tho top : 

 leaves clasping at base, pinnatifid ; the oblong lobes and the spaces between them 

 sharply toothed: scales at the base of tho involucre conspicuous and blackish- 

 tipped : rays none. 



Near San Francisco, &c. : the common Groundsel of Europe. 



2. S. sylvatiCUS, I.inn. More slender : leaves less clasping and with narrower 

 lobes : heads smaller : scales at the base of tho involucre f(;w, minute, Jiot bluckisli : 

 rays jn-osent but minute, hardly longer than tho disk-llowors. 



Introduced from Europe: San Lula Ubiapo (brewer), ami San Diego, Coo})cr. Maro Isiand, 

 Orccnc. 



* * Root annual : rays conspicuous : indigenous species. 



3. S. Califomicus, DC. A foot or two high, with slender rather simple stem, 

 glabrous or with some scattered hairs: leaves lanceolate, linear, or the lowest oblong, 

 varying from sparsely denticulate to pinnatifid ; the cauline with mostly clasping 

 base; their lobes oblong or broadly linear: heads corymbose: rays elongated: 

 akenes canescent. — aS". Coronopus, Nutt., a form of this with the leaves decidy or 

 oven doubly pinnatifid. 



