454 



COMPOSITAE. 



[Vol. III. 



82. PECTIS L. Syst. Xat. Ed. 10, 2: App. 1376. 1759. 



Annual or perennial, diffuse prostrate or erect, mostly glabrous herbs, glanildotted and 

 strong-scenteil, with opposite narrow sometimes ciliate leaves, and small usually cymose 

 heads of both tubular and radiate yellow flowers. Involucre cylimiric, oblong or canipanu- 

 late, its bracts in i series, narrow, keeled, distinct. Receptacle small, naked. Ray-flowers 

 pistillate, the rays small, entire or j-lobed. Disk-flowers perfect, their corollas with ex- 

 panded, somewhat irregularly 5-clcft limbs. Anthers entire at the base. Style-branches of 

 the disk-flowers very short, obtuse. .Vchcnes linear, slightly angled, striate. Pappus of 

 several or numerous scales, slender bristles or awns, sometimes with a few outer smaller 

 additional ones. [Latin, pecleit, comb, referring to the pappus.] 



About 50 species, natives of the warmer parts of .Vmerica. Besides the following, about 10 

 others occur in the southern and western parts of tlie I'nited States. 



I. Pectis angustifolia Torr. Lemon-scented 

 Pectis. (Fig. 3981.) 



Pedis anguslifolia Torr. Ann. Lye. X. Y. 2: 214. 1827. 



Annual, much branched, 4'-i2' high, the branches 

 diffuse or ascending. Leaves narrowly linear, sessile, 

 obtusish, Yz'-i' long, \" wide or less, often ciliate with 

 a few bristles near the base; heads several or nu- 

 merous, short-pcduncled, about 3" broad; involucre 

 short-cylindric or narrowly campanulate, its bracts 

 about S, linear, acutish, partly enclosing the outer 

 achenes; rays few, 3-toothed, or entire; pappus a crown 

 of 4-6 somewhat united short scales, with or without 2 

 slender short awns. 



In dry soil, Nebraska and Colorado to Mexico and Ari- 

 zona. Plant with the odor of lemons. May-Oct. 



83. ACHILLEA L. Sp. PL 89S. 1753. 



Heibs, mostly perennial, with erect leafy stems, finely dissected, piunatifid or serrate al- 

 ternate leaves, and small heads of both tuljular and radiate flowers, corymbose at the ends 

 of the stem and branches. Involucre obovoid, or campanulate, its bracts appressed, imbri- 

 cated in few series, the outer shorter. Receptacle nearly flat or convex, chaffy, the mem- 

 branous chaff subtending the disk-flowers. Ray-flowers pistillate, fertile, the ra>s white or 

 pink. Disk-flowers perfect, fertile, their corollas yellow, 5-lobed. Anthers obtuse and en- 

 tire at the base. Style-branches of the disk-flowers truncate, .\chenes oblong or obovate, 

 slightly compressed. Pappus none. [Named for .■\chilles.] 



About 75 species natives of the northern hemisphere, mostly of the Old World, Besides the 

 following, another, or perhaps 2 others, occur in northwestern North America. 

 Involucre broadly campanulate; leaves serrate. i, A. Plarmica. 



Involucre ovoid; leaves finely dissected. 2. A. Millefolium. 



I. Achillea Ptarmica L. Siieezewort. 



White Tansy. Sneezewort-Yarrow. 



(Fig. 3982.) 



Achillea Ptarmica L. Sp. PI. 898. 1753. 



Perennial from horizontal or creeping rootstocks; 

 stem glabrous, or slighth- pubescent, nearly or quite 

 simple, i°-2° high. Leaves linear or linear-lanceo- 

 late, sessile and slightly clasping at the base, acute 

 at the apex, regularly and closely serrate, sometimes 

 pubescent on the veins beneath, l'-2yi' long, i)^"- 

 3" wide; heads not very numerous, 5"-9" broad; 

 peduncles puberulent; involucre broadly campanu- 

 late, its bracts ovate-oblong, obtuse or obtusish, 

 slightly tomentose; rays 5-15, white, rather large. 



In moist soil, Newfoundland. New Brunswick and 

 Quebec to Massachusetts and Jlichigan. Naturalized 

 from Europe. Native also of northern Asia. Called 

 also Goosetongue, Wild, Bastard or European Pellitory, 

 Fair Maid of France, Sneezewort Tansy. July-Sept. 



