1492 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM 



Isocoma drummondii Greene, Erythea 2: 111. 1894. 



Coahuila or Nuevo Le6n. Texas; type from Texas. 



Suflfruticose, about 30 cm. high, slender, resinous; leaves linear or verj^ narrowly 

 linear-spatulate, 2 to 5 cm. long, 1 to 2. .5 mm. wide, entire or rarely with one or 

 two teeth or short lobes; heads discoid, 18 to 30-flowered, in close terminal panicled 

 3ymes; involucre 4 to 5 mm. high, about 5-seriate, graduate, the oblong or linear- 

 oblong, obtuse to acute phyllaries with distinct short greenish tips; achenes silky; 

 pappus brownish. 



15. Aplopappus heterophyllus (A. Gray) Blake in Tidestrom, Contr. U. S. 

 Nat. Herb. 25: 546. 1925. 



Linosyris heterophylla A. Gray, PI. Wright. 1: 95. 1852. 



LinosyrU wrightii A. Gray, PI. Wright. 1: 95. 1852. 



Linosyris hirtella A. Gray, PI. Wright. 1: 95. 1852. 



Bigelovia wrightii A. Gray, Proc. Amer. Acad. 8: 639. 1873. 



Isocoma heterophylla Greene, Erythea 2: 111. 1894. 



Isocoma hirtella Heller, Muhlenbergia 1: 6. 1900. 



Isocoma ivrightii Rydb. Bull. Torrey Club 33: 152. 1906. 



Isocoma limitanea Rose & Standi. Contr. U. S. Nat. Herb. 16: 18. pi. 14- 1912. 



Isocoma oxylepis Woot. & Standi. Contr. U. S. Nat. Herb. 16: 180. 1913. 



Chihuahua and Sonora. Colorado to Texas and Arizona; type from valley of 

 the Rio Grande, Texas. 



Suffrutescent below or suffruticose, about 60 cm. high, hirtellous to sub- 

 glabrous; leaves linear to linear-oblanceolate, 2 to 6 cm. long, 2 to 5 mm. wide, 

 usually hispidulous along margin, entire or the lower sometimes laciniate- 

 dentate; heads numerous, sessile or pedicellate, in terminal paniculate cymes; 

 involucre 4 to 5 mm. high, the phyllaries about 5-seriate, strongly graduate, 

 narrowly oblong to lance-oblong, obtuse or sometimes acute, with obscurely 

 greenish tips; heads discoid, 7 to 15-flowered; achenes silky. 



16. Aplopappus venetus (H. B. K.) Blake. 

 Baccharis veneta H. B. K. Nov. Gen. & Sp. 4: 68. 1820. 

 Aplopappus discoideus DC. Prodr. 5: 350. 1836. 



Linosyris mexicana Schlecht. "Ind. Sem. Hort. Halens. 1839: 9. 1839;" 

 Linnaea 14: Litt.-Ber. 128. 1840. 



Bigelovia veneta A. Gray, Proc. Amer. Acad. 8: 638. 1873. 



Isocoma veneta Greene, Erythea 2: 111. 1894. 



Coahuila (or Nuevo Le6n) to Morelos; type from Cuernavaca, Morelos. 



Frutescent, about 30 cm. high, more or less hirtellous; leaves cuneate or 

 cuneate-oblanceolate, 1 to 2.8 cm. long, 3.5 to 10 mm. wide, denticulate to 

 laciniate-toothed with 1 to 6 pairs of spinulose-tipped teeth, usually entire below 

 the middle, dotted; heads discoid, 23 to 30-flowcred, several or numerous, mostly 

 pedicellate, in close, usually panicled, terminal cymes; involucre 5 to 7 mm. high, 

 the phyllaries lance-oblong to ovate or oblong, with distinctly greenish, usually 

 acute or acutish tips; achenes densely silky. "Damiana," "falsa damiana;" 

 "boxosdd" (San Luis Potosi). 



A decoction of the plant is sometimes used in the form of baths as a remedy 

 for rheumatism. The plant has sometimes been confused with the true damiana, 

 Turnera diffusa (see page 848), and aphrodisiac properties have been wrongly 

 ascribed to it. 



17. Aplopappus hartwegi (A. Gray) Blake. 



Bigelovia hartwegi A. Gray (Hemsl. Biol. Centr. Amer. Bot. 2: 115. 1881, 



nomen nudum), Syn. Fl. 1^: 123. 1884. 

 Isocoma hartwegi Greene, Erythea 2: 111. 1894. 

 Aguascalientes and San Luis Potosi to Puebla; type from Lagos, Jalisco. 



