492 SYNGENESIA [Bmwjmb^^ 



pose. It is certainly not a native, here ; although usually given as a North Anter. 

 ican plant, along with some 12 or 14 other species. Pro/. Hooker enumerates 22 

 species in British America. 



393. TANACETUM. L. Nutt. Gen. 652. 

 [Corrupted from Athanasia, Gr.a,not, & Thanatos, death; from its durable flowers l" 



Bead* rather large, homogamous, or heterogamous with pistillate florets 

 in a single series in the circumference, the rest perfect. Involucre 

 campanulate, imbricated. Rays trifid, often obsolete, or wanting. 

 Jlkene8 angular, with a large cpigynous disk; pappus erown-form 

 minute, sometimes obsolete, often more conspicuous on the outer side' 

 Receptacle more or less convex, naked. 



I. T. vulgauk, L. Leaves smoothish, pseudo-pinnate, segments 

 lance-oblong, pinnatiful and incised-serrate ; heads heterogamous co- 

 rymbose. Beck, Bot. /i. 211. 



Common Tanacktum. Vulgo — Tansey. 



Gallice — Tanaisic. Germa?iice—Bcr Rainfarn. Ilisp.— Tanaceto. 



Root perennial. Stem 2 to 4 feet high, terete, ribbed and striate, smoothish, 

 somewhat branched above. Leaves alternate, smoothish, punctate, 2 or 3 to 6 or 

 8 inches long, interruptedly pseudo-pinnate, the segments pinnatifid, unequally 

 and sharply incised-serrate. Heads of flowers depressed-hemispherical, in dense 

 terminal fastigiate corymbs; involucre smoothish, the outer leaflets lanceolate 

 acuminate, the inner ones oblong, obtuse, the margin and apex scarious ; florets 

 deep yellow, sprinkled with resinous particles, very numerous and crowded in 

 the disk, the marginal ones pistillate, trifid, obsoletely radiate. Akenes 5-angled, 

 smooth ; pappus crown-form, of minute scales. KcccjjIucIc naked, nearly flat. 

 Hob. About gardens, fence-rows, &c. frequent. Ft. July—August. *>. Sept. 



Obs. This foreigner is becoming gradually naturalized. The plant is bitter and 

 aromatic,— and the infusion a very popular domestic medicine. Mr. Nuttall 

 mentions one native species in the U. Stales. 



Sub-Tribe 8. Gnaphalibjb. Beads many-flowered, or often few-flowered, rarely 

 >radiate, sometimes dioicous. Corolla of the pistillate or neutral florets Aliform, 

 rarely ligulate. Anthers caudate. Pappus hair-like, or setaceous, often XonL 

 rarely crown-form, sometimes none. 



394. GNAPHALIUM. L. JYult. Gen. 656. 

 [Greek, Gnaphalon, soft down, or wool ; with which the plants are clothed.] 



Heads mostly many-flowered, the pistillate florets numerous, in several 

 series in the circumference ; sometimes dioicous. Involucre imbricated 

 the leaflets scarious, often colored. Florets tubular, filiform. Jlkenes 

 not beaked ; pappus in a single series, capillary, or clavate. Receptacle 

 mostly flat, naked. 



f Beads heterogamous : Pappus all capillary. 



1. G. puhpureum, i. Stem erect, simple ; leaves oblong-spatulate, 

 tomentose beneath ; heads of flowers sessile, clustered, axillary and 

 •terminal. Beck, Bot. p. 179. 



