Pedis. COMPOSITE. 399 



rigid scabrous capillary bristles, about the length of the corolla. — Herbs, sometimes 



with ligneous base, glabrous and often glaucous ; with slender branches terminated 



by pedunculate heads of yellow, whitish, or purplish flowers, and alternate or below 



opposite leaves ; these and the scales of the involucre marked by scattered immersed 



oil-glands, in the manner of Tagetes, &c, therefore strong-scented. 



Species all American, chiefly of Mexico and farther south, a few along the borders of the 

 United States, two in Lower California, but ouly the following within the State. 



1. P. gracile, Benth. Slender, loosely much branched from a rather woody 

 base, a foot or two high : lower leaves linear with tapering base, the upper nearly 

 filiform or slender-subulate: scales of the involucre 4 to 6, oblong-linear, obtuse, 

 with narrow scarious margins: head 5- 15-flowered : akenes scabrous-puberuleiit, 

 narrowed at the summit. — Bot. Sulph. 29. P. Greggii, var. minor, (hay. 



Gravellv banks, Fort Mohave and southward (Dr. Cooper, &c), San Diego, Cleveland. Heads 

 three quarters of an inch long: flowers " purple " or "dirty white." Herbage with a strong 

 fragrant or fennel-like odor. According to Mr. Johnson, who collected it on the Colorado River, 

 it is there called " Poison -flower." 



88. PECTIS, Linn. 



Head several-many-flowered, with pistillate rays; the flowers all fertile. Involucre 

 cylindrical or campanulate, of a few equal and mostly carinate-concave scales in a single 

 series. Receptacle small, naked. Rays entire or 2- 3-tootlied at the apex: disk-corollas 

 mostly slender, 5-toothed, sometimes unequally. Style long, somewhat thickened up- 

 wards and minutely hispid; the branches very short and obtuse or truncate. Akenes 

 linear or filiform, uiany-striatc. Pappus of few or rather numerous bristles, or seme- 

 times of a few awns, witli or without some small chaffy scales, sometimes in some 

 i ir all the flowers of little scales only, these united into a crown. — Low odorous 

 herbs (all American) ; with opposite narrow and chiefly entire leaves, their margins 

 beset with some long bristles, at least toward the base, in their substance as in that 

 ef the involucre bearing some scattered oil-glands. Heads small, or sometimes rather 

 ample for the size of the plant, scattered : flowers yellow. 



P. PUNCTATA, .Iaiv|. {Pectidiiim, 1)1'.), with its pappus of 3 or 4 very rigid smooth awn-. . i t i . I 

 P. MOLTI8ETA, Benth., with a pappus ef 'l or "• bristles or none in the disk, and leaves conspicu- 

 .usly bristle-fringed, grow in Lower California. 1'. prostrata, Cav., with broadish leaves and 

 sessje lea 3, comes into Arizona : as does P. iuberbis, Gray, a tall species remarkable for the 

 want of bristles to ilc leaves. The following are attributed to California solely on tin' authority 

 el' Coulter's collection, from which they were first described; and they may all have been col- 

 lected ea.st nf tin- l.'in Colorado. 



1. P. papposa, Gray. Annual, glabrous, diffusely much branched, a span to a 

 foot high, "lemon-scented" : leaves elongated-linear (2 or 3 inches long, less than a 

 lino wide), furnished with very few bristles at base : leads slender-peduncled, scat- 

 e red or corymbose, about 20 flowered : scales of the involucre 6 to 8, linear: rays 

 elongated, linear-oblong : pappus in the ray a scaly crown, in the disk of 15 to 20 

 capillary and very unequal barbellate bristles. — PI. Fendl. G2. 



California, Coulter, N'o. 331. Common in the Gila Valley aid through Arizona, Schott, Palmer, 

 Wright, See. Akenes slimier, minutely hirsute with glandular-tipped and sometimes hooked 

 hairs. Scales of tin- involucre marly infolding the ray-akenes, as in all our species. 



2. P. Coulteri, Gray, 1. c. Annual, puberulent, diffuse, 2 or •"■ inches high: 

 leaves narrowly linear (about ball' an inch long), sparsely bristle-fringed : hea I 

 pedum lea mostly longer than the leaves : scales of the involucre and exserted rays 



about 5, both oblong : pappus in ray and disk nearly alike, of J to I Bhort and 



toul awns which are retrorsely hi i-tly barbed. 



