238 NORTH AMERICAN FLORA [VoLuME 34 
1. Balsamita Balsamita (L.) Rydberg. 
Tanacetum Balsamita L.. Sp. Pl. 845. 1753. 
Balsamita major Desf. Act. Soc. Hist. Nat. Paris 1: 3. 1792. 
Tanacetum simplicifolium Salisb. Prodr. 190. 1796. 
Balsamita vulgaris Willd. Sp. Pl. 3: 1802. 1804. 
Balsamita suaveolens Pers. Syn. Pl. 2: 408. 1807. 
Pyrethrum Tanacetum DC. Prodr. 6: 63. 1837. 
Chrysanthemum Tanacetum Vis. Fl. Dalm. 2: 89. 1847. 
Pyrethrum Balsamita tanacetoides Boiss. Fl. Orient. 3: 346. 1875. 
Tanacetum balsamitum St.-Lag. Ann. Soc. Bot. Lyon 7: 136. 1880. 
Chrysanthemum Balsamita Baillon, Hist. Pl. 8: 311. 1882. Not C. Balsamita L. 1753. 
Chrysanthemum Santa-Maria Maza, Anal. Soc. Esp. Hist. Nat. 19: 277. 1890. 
Chrysanthemum Balsamita tanacetoides Boiss.; W. Miller, Cycl. Am. Hort. 313. 1900. 
A leafy herbaceous perennial; stem 5-12 dm. high, angled and grooved, puberulent; 
lower leaves 1—2 dm. long, petioled; blades puberulent or finely pilose, often somewhat canes- 
cent, obovate or oblanceolate, crenate or dentate, rounded at the apex; upper leaves 3-5 cm. 
long, subsessile, obovate or ovate in outline, crenate, obtuse, often incised or lobed towards 
the base; involucre 4 mm. high, 6-7 mm. broad; bracts 25-30, the outer linear, wholly green, 
the inner oblong with scarious erose tips; ray-flowers usually wanting; disk-corollas 2.5 mm. 
long; achenes fully 1 mm. long. 
TYPE LocaLity: Etruria [Tuscany], Italy. 
DISTRIBUTION: Escaped from cultivation from Maine to New York, Indiana, and Michigan; 
native of southern Europe and the Orient. 
ILLUSTRATIONS: Cycl. Am. Hort. f. 464; Schkuhr, Handb. pl. 240; Reichenb. Ic. Fl. Germ. 
16: pl. 995, f. II, 4,5; Hayne, Arzn. Gew. 2: pl. 5; Britt. & Brown, Ill. Fl. f. 3991; ed. 2. f. 4564. 
11. TANACETUM (Tourn.) L. Sp. Pl. 843. 1753. 
Omalanthus Less. Syn. Comp. 260. 1832. Not Omalanthus A. Juss. 1824. 
Omalotes DC. Prodr. 6: 83. 1837. 
? Hemipappus C. Koch, Linnaea 24: 340. 1851. 
Strongly aromatic, leafy, mostly perennial herbs, with rootstocks. Leaves alternate, once 
to thrice pinnatifid, conspicuously punctate. Heads corymbose, usually several or many, 
in one species sometimes solitary, radiate, but the rays often inconspicuous and not exceeding 
the disk. Involucre hemispheric or in ours often broader; bracts in 2-3 series, usually narrow, 
not very unequal in length. Receptacle convex, naked. Ray-flowers 5-20, in a single series, 
pistillate and fertile; ligules yellow, varying from erect, 3-lobed, concave, and scarcely ex- 
ceeding the disk to spreading, flat, and well developed. Disk-flowers many, hermaphrodite 
and fertile; corolla cylindric, 5-lobed, with the tube and throat poorly differentiated. Style 
in the ray-flowers slightly exserted, in the disk-flowers included. Anthers with obtuse tips. 
Achenes subcylindric, those of the ray-flowers mostly 3-angled, those of the disk-flowers 
5-angled. Pappus-squamellae united into a short crown. 
Type species, Tanacetum vulgare L,. 
Ray-flowers scarcely surpassing the disk; ligules inconspicuous, erect, 3-lobed, 
very concave. 
Segments of the leaves acute or obtuse, not densely crowded; involucre 
8 mm. broad. 1. T. vulgare. 
Segments of the leaves rounded at the apex, the secondary ones very 
crowded; involucre 10-16 mm. broad. 5. T. camphoratum. 
Ray-flowers distinctly longer than the disk-flowers. 
Ligules erect or ascending, decidedly concave; heads several. 
Ligules obscurely lobed; divisions of the leaves acute, the ultimate 
ones lanceolate. 2. T. huronense. 
Lig ules deeply 3-lobed; divisions of the leaves obtuse or rounded at 
© apex, the ultimate ones oblong. 3. T. Douglasii. 
Tapas Spreading, flat; heads 1-4. 4. T. bipinnatum. 
1. Tanacetum vulgare L. Sp. Pl. 844. 1753. 
Tanacetum vulgare crispum I,. Sp. Pl. 845. 1753. 
Tanacetum officinarum Crantz, Inst. 1: 273. 1766. 
Tanacetum elatum Salisb. Prodr. 190. 1796. 
Tanacetum crispum Steud. Nom. Bot. Phan. 825. 1821. 
Pyrethrum vulgare Boiss. Fl. Orient. 3: 352. 1875. 
Chrysanthemum Tanacetum Baillon, Hist. Pl. 8: 311. 1882. Not C. Tanacetum Vis. 1847. 
