STANDLEY TREES AND SHRUBS OF MEXICO 1615 



101. CHRYSACTINIA A. Gray, Mem. Amer. Acad. n. ser. 4: 93. 1849. 



References: Blake, Proc. Amer. Acad. 51: 524-525. 1916- Rvdberc N 

 Amer. Fl. 34: 180-181. 1915-16. 



Low, nearly or quite glabrous shrubs; leaves opposite or alternate, entire or 

 pinnatilobate, glandular-punctate; heads solitary, radiate, yellow or orange; 

 involucre of 8 to 12 free linear phyllaries, each with a terminal' oil gland; achenes 

 slender; pappus of numerous bristles. 



The following treatment includes all the known species. 

 Leaves entire. 



Leaves subulate, 0.7 to 1.2 mm. wide; phyllaries 12 1. C. mexicana. 



Leaves filiform-subulate, 0.25 mm. wide; phyllaries 8 2. C. acerosa. 



Leaves pinnatilobate. 



Leaf lobes 9 to 17, acute 3. c. pinnata. 



Leaf lobes 3 to 11, truncate 4. c. truncata. 



1. Chrysactinia mexicana A. Gray, Mem. Amer. Acad. n. ser. 4: 93. 1849. 



Pedis taxifolia Greene, Leaflets 1: 148. 1905. 



Chihuahua to Tamaulipas, south to Veracruz and State of Mexico; type from 

 Saltillo, Coahuila. Texas and New Mexico. 



Undershrub, much branched, up to 60 cm. high; leaves 4.5 to 15 mm. long, 

 spinulose-tipped, bearing numerous glands; heads golden yellow, about 2 cm. 

 wide; involucre 4 to 5 mm. high. "Calanca" (Veracruz) ; "yeyepaxtle" (Puebla) ; 

 "San Nicolds," "hierba de San Nicolds" (Coahuila, Durango, San Luis Potosi); 

 "damiana," "damianita" (Chihuahua, Durango, Texas, etc.); "mariola" 

 (Valley of Mexico); "falsa damiana;" "garanona;" "romerillo" (Coahuila, 

 Hidalgo); said to be known sometimes as "guayule." 



The plant is bitter and has a strong but rather agreeable odor. It is much 

 used in domestic medicine, aphrodisiac, antispasmodic, sudorific, and diuretic 

 properties being ascribed to it. It is used especially in the treatment of fevers 

 and rheumatism. 



2. Chrysactinia acerosa Blake, Proc. Amer. Acad. 51: 525. 1916. 



Known only from the type locality, Sierra de Guascama, Minas de San Rafael, 

 San Luis Potosi. 



About 30 cm. high; leaves with few small glands; involucre 3.5 mm. high. 



3. Chrysactinia pinnata S. Wats. Proc. Amer. Acad. 25: 154. 1890. 

 Known only from the type locality, near Monterrey, Nuevo Le6n. 



Leaves opposite, oblong in outline, 2.5 to 5 cm. long, 1.2 to 1.9 cm. wide, the 

 lobes obliquely deltoid, acute, entire; rays whitish inside, orange outside; disk 

 orange. 



4. Chrysactinia truncata S. Wats. Proc. Amer. Acad. 25: 154. 1890. 

 Coahuila and Nuevo Le6n; type from Sierra de la Silla, Nuevo Le6n. 

 Leaves ovate or ovate-oblong in outline, 1.5 to 3 cm. long, 8 to 12 mm. wide, 



the lobes usually toothed; heads 2 to 3 cm. wide; rays bright yellow. "Hierba 

 del venado" (Coahuila). 



• 102. PECTIS L. Syst. Nat. ed. 10. 1221. 1759. 



References: Fernald, A systematic study of the United States and Mexican 

 species of Pedis, Proc. Amer. Acad. 33: 57-86. 1897; Rydberg, N. Amer. Fl. 

 34: 194-216. 1916. 



Herbaceous or suffruticulose; leaves opposite, glandular-punctate, usually 

 entire, setose-ciliate; heads usually solitary, radiate, yellow; involucre of few 

 equal phyllaries; achenes slender; pappus (in ours) of 4 to 40 bristles, or these 

 sometimes reduced to squamellae, or (in the ray) wanting. 

 57020—26 20 



