4 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Oerst. Vidensk. Meddel. 1852, 102. Wihorgia urticaefoUa, HBK. Nov. 

 Geu. et Spec. iv. 257, t. 389 (1820). — South Mexico: plaius of 

 Quilo, Jurgensen, no. 260, ace. to Hemsl. 1. c. Nicaragua : Grenada, 

 Oersted. Cost A Rica : San Jose, Oersted^ Tonduz, no. 10,143 (hb. 

 Gr.) ; pastures at Copey, Tonduz, no. 11,757 (hb. Gr.). Ecuador: 

 Hnmholdt 8j- Bonpland, Couthouy (hb. Gr.). 



-1- -1- Achenes glabrous throughout. 



2. S. microglossa, DC. Leafy-stemmed, hirsute-pubescent, branch- 

 ing : peduncles glabrous ; heads numerous, small, 6 mm. in diameter : 

 rays 5, white or roseate, scarcely exceeding the involucre. — Prodr. v. 

 497 (1836), including the var. puberula, with pubescent peduncles (the 

 prevailing form); Hemsl. 1. c. 160. Baziasa microglossa, Steud. Nom. 

 ed. 2, i. 192 (1840). — Chihuahua: humid places, Pilares, Hartman, 

 no. 747 (hb. Gr.) ; near St. Julian, alt. 2150 to 24G0 m., Nelson, no. 

 4922 (hb. Gr.). Coahuila : near Saltillo, Palmer, no. 790, in part 

 (coll. of 1898). San Luis Potosi : 22° N. Lat., alt. 1850 to 2469 ra., 

 Parry ^ Palmer, with no. 492 (hb. Gr.). State of Mexico: moun- 

 tains, St. Augustin, Berlandier (hb. Gr.) ; Pedrigal, Pringle, no. 7345 

 (hb. Gr.) ; on walls, Pringle, nos. 7903, 8231 (both in hb. Gr.). 



3. S. humilis, Cass. Suberect, 3 dm. high or more often branching 

 from the base and widely spreading, pubescent : heads few to many, 1.4 

 cm. broad including the conspicuous well exserted externally roseate- 

 purple rays : disk-Howers numerous, pale yellow. — Diet. Sci. Nat. 

 xlvi. 481 (1827); DC. Prodr. v. 496; Hemsl. 1. c. ii. 160. Eclipta 

 humilis, HBK. Nov. Gen. et Spec. iv. 264, t. 394 (1820). Baziasa 

 humilis, Steud. Nom. ed. 2, i. 192 (1840). — Michoacan : near Ario 

 and Patzcuaro, alt. 1850 m., Humboldt S^ Bonpland. State of Mexico: 

 fields near San Nicolas, Bourgeau, no. 958 (hb. Gr.) ; valley of Toluca, 

 Berlandier, no. 1215 (hb. Gr.) ; moist meadows, Nevado de Toluca, alt. 

 3080 m., Pringle, no. 4245 (hb. Gr.) ; in mountains, Schaffner, no. 296 



(hb. Gr.). 



* » Perennials. 



■t- Stem prostrate, strongly repent. 



4. S. sarmentosa, Less. Stem elongated, 6 dm. or more in length, 

 rooting at the lower nodes, the internodes 2 to 8 cm. long : leaves ovate, 

 acute, 3 to 4 cm. long, half as broad, hirsute on both sides, narrowed to 

 slender petioles: heads solitary, terminal, long-peduncled, 2.2 cm. broad 

 including the rays ; peduncles densely appressed-pubescent and more or 

 less glandular: rays mostly 8, about 7 mm. long. — Linnaea, v. 148 



