460 



COMPOSITAE. 



[Vol. III. 





4. Matricaria matricarioides 



(Less.) Porter. Rayless Camomile. 



(Fig. 3995.) 



Santolina suaveolens Pursh, Fl. .\m. Sept. 



520. 1814. 2^01 Af. suazeolens t,. 1755. 

 Artemisia matricarioides Less. Linnaea, 6: 



210. 1831. 

 Matricaria discoidea DC. Prodr. 6: 50. 1S37. 

 Matricaria matricarioides'Pon.er. Mem. Ton. 



Club. 5: 341. 1894. 



.\nnual, glabrous; stem rerv leafy, at 

 length much branched, 6'-iS' high. Leaves 

 2-3-pinnately dissected into linear acute 

 lobes; heads numerous, 3"-4" broad, pe- 

 duncled; bracts of the involucre oval or ob- 

 long, green with broad white scarious mar- 

 gins, much shorter than the ovoid yellow 

 disk; rays none; receptacle conic; achenes 

 oblong, slightlj- angular, faintly nerved, 

 pappus an obscure crown, sometimes pro- 

 duced into 2 coriaceous oblique auricles. 



In waste places, in ballast and along; rail- 

 roads. Missouri to Maine, .\dventive from 

 the Pacific coast. Naturalized as a weed in 

 northern Europe. May-Aug. 



87. TANACETUM L. Sp. PI. 843. 1753. 



Erect, strongh' aromatic herbs, our species perennials, with alternate, 1-3-pinnately dis- 

 sected or divided leaves, and numerous small corymbose heads of tubular flowers, or with 

 rays sometimes present and imperfectly developed. Involucre hemispheric, depressed, or 

 campanulate, its bracts appressed, imbricated in several series. Receptacle flat or convex, 

 naked. Marginal flowers pistillate, fertile, their corollas 2-5loothed or lobed, sometimes 

 produced into short rays. Disk-flowers perfect, fertile, their corollas 5-toothed. Anthers ob- 

 tuse and entire at the base, their tips broad. Style-branches truncate and penicillate at the 

 summit, .\chenes 5-angled or 5-ribbed, truncate or obtuse. Pappus none, or a short crown. 

 [From tanasie, old French for tansy; Greek, athanasia, immortality.] 



.\bout 35 species, natives of the northern hemisphere. Besides the following, 6 others occur 

 in western and northwestern North America. 



Glabrous, or nearly so; heads numerous, 3"-5" broad. i. T. ztilgare. 



Villous-pubescent: heads few, 6"-S" broad. 2. T. Huronense. 



I. Tanacetum vulgare L. 



Tanacetum -jiilgare L. Sp. PI. S44. 1753. 



Stem stout, usually simple up to the in- 

 florescence, glabrous, or sparingly pubescent, 

 iJi°-3° high. Leaves pinnately divided 

 into linear-oblong, pinnadfid or incised seg- 

 ments, the lobes acute, usually serrate; 

 lower segments of the leaves often smaller 

 than the others; basal leaves often 1^ long; 

 heads commonly numerous, 3"-5" broad, 

 rather short-peduncled ; involucre depressed- 

 hemispheric, its bracts oblong-lanceolate, 

 obtuse, or the outer acute, slightly pubes- 

 cent or ciliate; receptacle flat; flowers yel- 

 low; marginal corollas with short oblique 

 5-toothed limbs; pappus a short crown. 



.\long roadsides, mostly escaped from gar- 

 dens, Xova Scotia and Ontario to Minnesota, 

 south to North Carolina and Missouri. Natu- 

 ralized or adventive from Europe. Other Eng- 

 lish names are Bitter Buttons, Hindheal. Gin- 

 ger-plant. July-Sept. 



Tanacetum vulgare crispum DC. Prodr. 6; 12S. 



1837. 

 Leaf-segments more incised and crisped. 

 Occasional, in similar situations. In some 

 places more plentiful than the type. 



Tansv. 



