1590 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM 



78. HIDALGOA Llave in Llave & Lex. Nov. Veg. Descr. 1: 15. 1824. 

 1. Hidalgoa ternata Llave in Llave & Lex. Nov. Veg. Descr. 1: 15. 1824. 



Hidalgoa lessingii DC. Prodr. 5: 511. 1836. 



Melampodium ? hidalgoa DC. Prodr. 5: 521. 1836. 



Veracruz and Oaxaca; type from Rio Blanco, near San Jos4 del Corral. Guate- 

 mala and Ecuador. 



Suffrutescent (?), somewhat sordid-pubescent or essentially glabrous, high- 

 climbing, the basally coiled and often thickened petioles functioning as tendrils; 

 leaves opposite, the petioles slender, about 4 cm. long, the blades about 6 cm. 

 long, ternatisect, the lobes ovate, acute, crenate-serrate, stipitate or subsessile, 

 thin; heads solitary or few, axillary and terminal, long-peduncled, 2.2 to 4.2 cm. 

 wide; involucre double, as in Coreopsis; rays 5, orange, yellow, or apparently 

 purplish red, fertile; disk yellow (?), infertile, the styles undivided, the corollas 

 irregular, one tooth being deeper cut than the others; ray achenes oval, obcom- 

 pressed, thick, drupaceous, glabrous, about 7 mm. long, crowned with a pair 

 of short, thick teeth. 



79. THELESPERMA Less. Linnaea 6: 511. 1831. 

 1. Thelesperma longipes A. Gray, PI. Wright. 1: 109. 1852. 



Coahuila, Nuevo Leon, and San Luis Potosf. Texas to Arizona; type from the 

 San Pedro River, Texas. 



Suffrutescent, 15 to 40 cm. high, much branched at base, nearly glabrous, very 

 leafy; leaves opposite, 2.5 to 7 cm. long, pinnately parted into 3 or 5 filiform or 

 linear-filiform lobes as wide as the rachis, or the upper entire; heads discoid, 

 yellow, 7 to 10 mm. wide, solitary at apex of slender naked peduncles 9 to 24 cm. 

 long; involucre double, the outer of small lance-ovate herbaceous phyllaries, the 

 inner of submembranous dark phyllaries, these connate about to middle, with 

 scarious yellow border; achenes thickened, curved, about 2.5 mm. long, muricate; 

 pappus an obscure border, sometimes produced into 2 vctv short teeth. " Hierba 

 de San Nicolds " (Nuevo Le6n). 



80. BIDENS L. Sp. PI. 831. 1753. 

 Herbs, rarely suffrutescent; leaves mostly opposite; heads few to numerous, 

 in ours yellow and radiate; involucre double, as in Coreopsis; achenes (in ours) 

 linear, flattened or subquadrangular; pappus usually of 2 to 4 commonly retrorse- 

 hispid awns. 



Leaves dissected into linear-filiform segments 1. B. nudata. 



Leaves pinnately parted into 3 or 5 ovate to lanceolate divisions, rarely undivided. 



2. B. squarrosa. 



1. Bidens nudata T. S. Brandeg. Zoe 1: 309. 1890. 



Cape Region of Baja California (Sierra de San Francisquito). 



Suffrutescent, about 60 cm. high, essentially naked above, trichotomously 

 branched, glabrous; leaves petiolate, 5 to 10 cm. long, twice or thrice pinnatisect 

 into linear-filiform segments less than 1 mm. wide, as broad as the rachis; heads 

 about 3, long-peduncled, yellow, radiate, about 1.5 cm. wide; rays pistillate; 

 achenes linear, subquadrangular, about 6 mm. long; pappus of 2 or 3 retrorsely 

 hispid awns about 3 mm. long. 



2. Bidens squarrosa H. B. K. Nov. Gen. & Sp. 4: 238. 1820. 

 Bidens tereticaulis DC. Prodr. 5: 598. 1836. 



Bidens antiguensis Coulter, Bot. Gaz. 16: 100. 1891. 



Bidens tereticaulis sordida Greenm. Proc. Amer. Acad. 39: 115. 1903. 



Bidens tereticaulis indivisa Robinson, Proc. Bost. Soc. Nat. Hist. 31: 270. 



1904. 

 Bidens coreopsidis procumbens Donn. Smith, Bot. Gaz. 42: 299. 1906. 



