184 NORTH AMERICAN FLORA [VoLuUME 34 
pale; glands oblong, conspicuous, along the margins, one in each sinus; heads solitary at the 
ends of the branches; peduncles clavate, 2-7 cm. long; involucre at first cylindric, 20-22 mm. 
high, 5-6 mm. broad, in age turbinate and broader; bracts mostly 5, linear, acute or obtuse, 
with 2 rows of linear glands; corollas about 12 mm. long; tube pale, many times longer than 
and gradually passing into the purple funnelform throat; lobes lanceolate; achenes 12-13 
mm. long, hispidulous; pappus sordid-brown, fully 1 cm. long; bristles minutely scabrous. 
TYPE LocaLity: Near Villalpando, Mexico. ‘ ee 
DISTRIBUTION: Arizona, and throughout Mexico to Panama; also in Ecuador. 
ILLUSTRATION: Hernandez, Nov. Pl. Mex. 434, f. 3. 
2. Porophyllum leiocarpum (Urban) Rydberg, sp. nov. 
Porophyllum macrocephalum leiocarpum Urban, Symb. Ant. 1: 466. 1900. 
An erect annual; stem branched above, glabrous, often violet and glaucous, striate; 
leaves opposite or some alternate; petioles 1-2 cm. long; blades oval, thin, 1-4 cm. long, sub- 
entire or sinuate, usually rounded at both ends, with a few oblong glands near the sinuses of 
the margins and one at the apex; heads solitary at the ends of the branches; peduncles slightly 
clavate, erect, 4-5 cm. long; involucre at first cylindric, 20-22 mm. high, 5-8 mm. broad, 
in age more turbinate and broader; bracts 5, linear, acute, with 2 rows of linear glands; corollas 
10-12 mm. long; tube slender, much longer than the funnelform dark-purple throat; lobes 
narrowly lanceolate; achenes dark, 10 mm. long, glabrous; pappus about 8 mm. long; bristles 
20-80, minutely scabrous. 
TYPE LOcALITy: Near Aybonito, Porto Rico. 
DISTRIBUTION: Porto Rico. 
3. Porophyllum Porophyllum (L,.) Kuntze, Rev. Gen. 3*: 168. 
1898. 
Cacalia Porophyllum L. Sp. Pl. 834. 1753. 
Kleinia ruderalis Jacq. Enum. Pl. Carib. 28. 1760. 
Cacalia ruderalis Sw. Prodr. 110. 1788. 
Kleinia’ Porophyllum Willd. Sp. Pl. 3: 1738. 1804. 
Porophyllum ellipticum Cass. Dict. Sci. Nat. 43:56. 1826. 
Porophyllum ruderale Cass. Dict. Sci. Nat. 43: 56. 1826. 
Porophyllum eilipticum genuinum Urban, Symb. Ant. 1: 467. 1900. 
Porophyilum ellipticum ruderale Urban, Symb. Ant. 1; 468. 1900. 
Porophyllum ruderale ellipticum B. 1. Robinson, Proc. Am. Acad. 49: 509. 1913. 
An erect annual; stem much branched above, glabrous, striate; leaves alternate or oppo- 
site; petioles slender, 1-2 cm. long; blades elliptic, thin, 1-6 cm. long, obtuse, mucronate, or 
acute at the apex, usually acute at the base, entire or sinuate, with conspicuous elongate 
glands along the margin, rarely a few scattered over the surface, or sometimes even gland- 
less; heads solitary at the ends of the branches; peduncles 3-5 cm. long, somewhat clavate; 
involucre at first cylindric, about 2 cm. high and 8 mm. broad, in age broader; bracts 5, linear, 
acuminate, with two rows of glands; corollas 12-14 mm. long; tube filiform, much longer than 
and gradually passing into the olive-green or purplish funnelform throat; lobes lanceolate; 
achenes 8 mm. long, tapering at both ends, hispidulous; pappus straw-colored or yellowish, 
about 1 cm. long; bristles scabrous. 
TYPE LOCALITY: America. 
DISTRIBUTION: West Indies, Costa Rica, and Panama; in South America south to Argentina. 
ILLUSTRATIONS: Morison, Hist. sect. 7, pl. 17, f. 7; Cav.Ic. pl. 222; Pluk. Phytogr. pl. 161, f. 1; 
Los ee Am. pl. 127 (Sel. Stirp. Am. Pict. pl. 195; Am. Gew. pl. 240); E. & P. Nat. Pfl. 45: 
> 
4. Porophyllum Pringlei B. L. Robinson, Proc. Am. Acad. 27: 178. 
1892. 
A slender glaucous annual; stem 3-6 dm. high, terete, branched above; leaves of the 
stem opposite; petioles 1-2 cm. long, slender; blades oval or elliptic, subentire, rounded at the 
apex, acute at the base, very thin, 2-4 cm. long, 1-2 cm. wide; leaves of the branches smaller 
and alternate; glands marginal, few, elliptic; heads few, erect; peduncles erect, 1-3 cm. long; 
involucre cylindric, about 18 mm. high; bracts 5, narrowly linear, acuminate, scarious-margined, 
