456 CAEDUAGEAE. 



1. PorophyUum PorophyUum (L.) Kuntze, Bev. Gen. PI. 3^ 168. 1898. 



Cacalia PorophyUum L. Sp. PI. 834. 1753. 



Porophyllum ruderale Griseb. PI. Br. W. I. 379. 1861. Not Cass., 1826. 



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

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

 low-crenate or entire, 2-7 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; achenes linear, about 8 mm. long, dark brown, 

 hispidulous. 



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

 Island, Eleuthera, Oat Island and Great Bxuma : — West Indies and continental trop- 

 ical America.. Pohophyllum. 



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-oiliate 

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

 flowers. Involucre eylindrie, oblong or eampanulate, its bracts in 1 series, 

 narrow, keeled, distinct. Receptacle 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. Achenes 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: Pedis UnifoUa L. 



Pappus of scales. 1. P. leptocephala. 



Pappus of 2—4 subulate awns. 2. P. UnifoUa. 



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



Chthonia leptocephala Cass. Diet. Sei. Nat. 27: 206. 1823. 

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



Glabrous or nearly so; stems slender, diffusely branched, 1-^ 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; achenes narrow, about 3 

 mm. long; pappus of subulate-lanceolate scales. 



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

 Hispanilola. Recorded by Mrs. Northrop, by DoUey and by Hitclicock as P. HnifoUa 

 Zi. Nabeow-i-ba\-ed PEiCtis. Wrongly called Pennykoyal. 



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



Pectis punctata Jacq. Enura. 28. 1760. 



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

 high. Leaves linear, 2-8 em. 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 flliform 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: achenes linear, 4-6 mm. long, gla- 



