170 



ORDER F.XtV. ( ..Ml 1 . -IT.E COMPOOTTE-FAMTLY. 



receptacle. An lll-eMnttd plant, 1 ft. Men, with dark-gnm, very finely dts- 

 Meted leaves. Naturalbwd, and common In road-aide* ud waste places. Junt. 

 Btp. 



si. ACIIILI.I:.V 



Heads many-flowered. Rays 6 10, pistillate. luvolu.-iv 

 with imbricate, unequal scales. Receptacle flat, clinffy. r.i|'|">- 

 none. Per. 



1. A. millefi>lium. Yarrow. 



Stem erect, furrowed, touching above ; leave* alternate, bl-plnntely 

 divided, Mfment* linear, toothed or lobed, mncronate; heads small, numerous, 

 la dense, flat, terminal eorymbs ; ray about 8, short, white (sometimes roue- 

 color); Involucre furrowed, oblong. A common plant, with a pungent and 

 aomewhat agreeable odor; 1 ft high ; In fields and pastures. June Aug. 



25. LEUCANTHEMUM. 



Heads many-flowered. Rays numerous, pistillate. Involucre 

 depressed, flatfish ; scales imbricate with scarions margins. Re- 

 ceptacle naked, flat Achenia striate. Pappus none. Per. 



1. L. Tulgdre. Ox-eye Daisy. 



Stem erect, simple, or sparingly branched, furrowed. Leaves few and 

 rather small, cut-plnnatlnd, incised at base; radical ones spatnlate, petlolate ; 

 upper ones lanceolate, more or leu clasping at base; beads large, solitary, on 

 long, naked, furrowed peduncles; rays white; disk yellow; Involucre-Male* 

 with brownish margins. A common and troublesome weed with !>howy heaila 

 Introduced. JulyStp. 



2. rYKETHKUM. 



Heads many-flowered. Involucre hemispherical. Scales im- 

 bricate, with membraneous margins. Receptacle naked. Pap- 

 pus reduced to a membraneous border, crowning the achenia. 



PfT. 



1. P. parthenium. Feverfew. 



Stem erect, branching ; leaves alternate, pctlolate, trl-plnnately divided; seg- 

 ment! ovate. Incised ; brails numerous, cory mbosely arranged ; Involucre pubes- 

 cent Common In cultivation, and admired for Its pure white flowers, which 

 lejt for some time ; often double. 



2T. CHRYSANTHEMUM. 



Heads many ; flowcrcd. Involucre hemispherical. Scales im- 

 bricate, with membraneous margins. Receptacle naked. Pap- 

 pus none. Per. 



\. C. coronarium. Grecian Oirysanthemum. 



Stem erect, smooth, branching; leaves alternate, bi-plnnatlfld, clasping, 

 acute, broadest near the summit; heads large, terminal, solitary. A garden an- 

 nual. Flowers doable In cultivation. Aug. 



2. C. carinatum. Three-colored Oirysanthemum. 



Stem erect, branching; leaves bl-plnnate, fleshy, smooth; heads large, 

 ahowy; disk pnrple; rays white, yellow at base, or entirely yellow ; Involucre- 

 scales carlnate. A garden annual. July Oct. 



3. C. Sinfinse. Chinese Chrysanthemum. 



Btam erect, branching; leaves alnuate-plnnatlnd, toothed, coriaceous, glau- 

 cous, petloUte; rays very long, and of Disc, yellow, pnrple and reddish brown, 

 to a pore and vivid white. A beautiful plant cultivated In pots, and In 

 sheltered places In the open air. The varieties are almost endless. 



29. COREOPSIS. 



Head* many-flowered. Rays about 8; neutral. Involucre 

 double. Each series 610 leaved. Receptacle flat and chaffy. 

 Achenia compressed, cmarginate, 2-awned. 



1. C. tinct&ria. Coreopsis. 



Smooth; stem erect, branching; radical leave* somewhat bl-plnnate, *eg- 

 ment> oral, entire ; canllne one* aomewhit pinnate, with linear segment* ; 

 k**d* large, numerous, brilliant; ray* bright yellow, brownish purple at base; 

 01 anil smooth. A beautiful garden annual, 13 ft high. Very common In 

 eolUvatlon, with elegant foliage, and numerous very brilliant flower*. AU 



*. BlDENS. 



.leads many-flowered. Rays neutral, sometimes inconspicu- 

 ous, or wanting. Involucre double. Outer aeries large and 



folioceons. Receptacle chaffy, flat. Achenia compressed. 

 slendi-r and 4-sided, armed with 24 rigid, persistent *wn, 

 which are rough backwards An. 



1. B. frondosa. // Ticks. 

 Smooth, or slightly pubescent ; stem erect tall, with spreading branches 



leaves pmnately 8 6-parted, segments lanceolate, acuminate, serrate, mostly 

 petiolate ; leaflets of the outer Involucre much longer than the flower, dilate at 

 base ; beads discoid ; acbenla flat cnneate-obovate, 8-awned, with rough mar- 

 gins, A common and extremely troublesome weed. In moist cultivated ground*, 

 and waste places ; the acbenla when mature clinging by their awns to every- 

 thing that passes them. JulyStp. An. 



2. B. comiata. Burr-Marigold. 



Stem erect with 4 furrows and opposite branches ; leaves lanceolate, op- 

 posite, acuminate, sharply serrate, tapering Into margined, somewhat connaU 

 petioles ; lower ones often 8-parted, with the lateral segments decurrent ; heads 

 solitary, discoid ; outer scales of the Involucre foUaceous, longer than the 

 flower; achenia flat narrowly cnneate, with awns. A common spedea, 12 

 ft high, In wet grounds. Aug.Stp. An. 



3. B. cernua. Nodding Burr-Marigol<l. 



Mostly smooth ; stem terete, with the branches opposite ; leaves lanceolate, 

 unequally serrate, slightly connate ; heads nodding, discoid, or wltli a few, 

 short, yellow rays ; leaflets of the outer Involucre longer than the head ; acbe- 

 nia wodge-obovato, armed with 4 awns. A common species, 12 ft. high, 

 growing In swamps and ditches. Aug.Stpt. An. 



4. B. chrysanthemoides. Large-flowered 



llnrr Marigold. 



Smooth; stem erect or decumbent; leaves lanceolate, attenuate at each 

 end, connate at base, with regular and even scrratures ; heads erect or nodding, 

 radiate ; rays large, conspicuous, bright yellow ; leaflets of the outer involucre 

 mostly shorter than the rays ; achenia cuneate with 24 awns. A common 

 and showy plant growing 6' 18', In swamps and ditches. Sept Oct. An. 



St. SENECIO. 



Heads many-flowered, cither discoid, with tubular, perfect 

 flowers, or radiate, with pistillate rays. Involucre-scales mostly 

 in a single row. Receptacle flat, naked. Pappus simple, capil- 

 lary, copious. Lrai-et alternate. 



1. S. vulg.'iris. Common Groundsel. 



Stem erect branching, angular, mostly smooth ; leave* plnnatlud, toothed, 

 clasping; radical ones pctlolate; heads discoid, terminal, yellow, in loose 

 corymbs, nodding. A common weed In waste grounds, 15' high, blooming the 

 whole season. An. 



2. S. aureus. Gold< n Srnrcio. 



Mostly smooth ; stem furrowed, erect nearly simple ; radical Irave* undi- 

 vided and roundish, mostly cordate, crennte, on long petiole* ; lower caullne 

 ones lyrate ; upper lanceolate, plnnatifld, sessile or somewhat claiplng ; heads 

 large, showy, with golden-yellow ray, somewhat umbellate, In flat terminal 

 corymbs ; Involncre-scales linear, acute. A very handsome and varial 

 10' 20' high ; common In meadows and damp thickets. 



The most marked varieties are 1. obovita, radical leave* orblcnlar-obo- 

 vate; found In drier grounds than the common form. 2. BalsamiUe, radical 

 leaves oblong or lanceolate, tapering at base to a petiole. In rocky place*. 

 May-JaM. Ptr. 



81. AI:TI:M|SIA. 



Heads discoid, few, or many-flowered. Flowers nil tubular; 

 marginal ones usually ]>i>tillMt 'lie rv-t per- 



fect Involucre-scales hnbriaota, <lrv and scarious on the mar- 

 gins. Receptacle flat, naked, or slightly huiry. Achenia with n 

 small disk at summit. Pappus 



1. A. caudata. -Slender-leaved Wormwood. 



Smooth; (tern straight herbaceous ; radical and lower leaves bl- or tripln- 

 natcly-parted ; upper ones plnnately-parted ; segments filiform, alternate ; head* 

 small, subglobcee, pedicellate, erect racemose. In a long, terminal panicle ; outer 

 scale* of the Involucre ovato, Innrr ones oval. Stem 25 ft, high. Common 

 near the see-ooaM, from N. H. southward. Srpt. Ken. 



2. A. Abrotanum. Southernwood. 



Stem erect shrubby ; lower loaves blplnnately-parte<! ; UPIKT ones pinnate 



