456 CARDUACEAE. 



1. Porophyllum Porophyllum (L.) Kuntze, Rev. Gen. PI. 3 2 : 168. 1898. 



CacaUa PoropliyUum L. Sp. PI. 834. 1753. 



PorophyUum ruderale Griseb. Fl. Br. W. I. 379. 1861. Not Cass., 1826. 



Annual; stem erect, often much branched, pale, slightly glaucous, 1 m. 

 high or less. Leaves thin, slender-petioled, oblong to ovate, obtuse or acute, 

 low-crenate or entire, 27 cm. long, bearing marginal glands or sometimes 

 glandless ; heads solitary at the ends of the branches, many-flowered ; involucre 

 about 2 cm. high, its 5 bracts linear, acute, bearing narrowly linear glands; 

 corolla about 10 mm. long; aehenes linear,, about 8 mm. long, dark brown, 

 hispidulous. 



Waste places and pot-holes in good soil, Abaco, Andros, New Providence, Harbor 

 Island, Eleuthera, Cat Island and Great Exuma : West Indies and continental trop- 

 ical America. POROPHYLLUM. 



31. PECTIS L. Syst, ed. 10, 1221. 1759. 



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

 gland-dotted and strong-scented, with opposite narrow, sometimes brstly-ciliate 

 leaves, and small, usually cymose heads of both tubular and radiate yellow 

 flowers. Involucre cylindric, oblong or campannlate, its bracts in 1 series, 

 narrow, keeled, distinct. Eeeeptacle small, naked. Ray-flowers pistillate, 

 the rays small, entire or 3-lobed. Disk-flowers perfect, their corollas with 

 expanded, somewhat irregularly 5-cleft limbs. Anthers entire at the base. 

 Style-branches of the disk-flowers very short, obtuse. Aehenes linear, slightly 

 angled, striate. Pappus of scales, slender bristles or awns, sometimes with a 

 few outer smaller additional ones. [Latin, pecten, comb, referring to the 

 pappus.] About 75 species, natives of the warmer parts of America. Type 

 species: Pectis linifolia L. 



Pappus of scales. 1. P. Icptnccphala. 



Pappus of 24 subulate awns. 2. P. linifolia. 



1. Pectis leptocephala (Cass.) Urban,, Symb. Ant. 5: 280. 1907. 



Chthonia Icptocepliala Cass. Diet. Sci. Nat. 27: 206. 1823. 

 Pectis Lessingii Fernald, Proc. Am. Acad. 33: 67. 1897. 



Glabrous or nearly so; stems slender, diffusely branched, 1-4 dm. high. 

 Leaves narrowly linear, 1-3 cm. long, less than 1 mm. wide, acute, bearing a 

 few bristles below the middle; heads filiform-peduncled, mostly solitary; 

 involucre narrow, 4-5 mm. high, its bracts linear; aehenes narrow, about 3 

 mm. long; pappus of subulate-lanceolate scales. 



Limestone soil, Andros, New Providence : .Florida ; Cays of northern Cuba ; 

 Hispaoriola. Recorded by Mrs. Northrop, by Dolley and by Hitchcock as P. linifolia 

 L. NAKROW-LEAVED PECTIS. Wrongly called PENNYROYAL. 



2. Pectis linifolia L. Syst. ed. 10, 1221. 1759. 



Pectis punctata Jacq. Enum. 28. 1760. 



Annual; sterna glabrous, very slender, usually much-branched, 2-9 dm. 

 high. Leaves linear, 2-8 cm. long, usually not more than 3 mm. wide, nar- 

 rowed at both ends, sparingly glanduliferous, commonly bearing 1-3 bristles 

 at the base ; heads on filiform peduncles 7-35 mm. long, 5-9-flowered ; in- 

 volucre about 6 mm. long, its 4 or 5 linear glabrous bracts obtuse with revo- 

 lute margins; flowers purplish to orange: aehenes linear, 4-6 mm. long, gla- 



