ROBINSON AND GREENMAN. — GENUS PERYMENIUM. 529 



25. P. Nelsonii. Shrub with stout subterete branchlets, cinereous 

 with copious short appressed or subappressed pubescence : leaves ovate, 

 acuminate, serrate, thickish, finely scabrous-pubescent above, pubescent 

 or almost tomentose beneath, rounded at the base, 6 to 10 cm. long, half 

 as broad : heads large, showy, corymbose ; pedicels subrigid, covered 

 with grayish subappressed or strigillose pubescence; bracts linear; in- 

 volucral scales oblong, rounded at the summit, ciliated : rays 8 or 10, 

 oblong, orange-yellow, 1.5 cm. long. — Chiapas, Mexico, E. W. Nelson 

 at two stations, namely, between San Cristobal and Teopisca, altitude 

 2,050 m. to 2,600 m., 4 December, 1895, no. 3465, and between Ocui- 

 lapa and Tuxtla, altitude 650 m. to 900 m., 29 August, 1895, no. 307G; 

 also at Comitan, C. & E. Seler, no. 2970. Types in herb. Gray, herb. 

 U. S. Nat. Museum, and herb. Berlin Museum. 



= = Petioles 2 to 3 cm. long. 



26. P. GRANDE, Hemsl. Shrub, hirsute throughout with spreading 

 hairs : leaves ovate-oblong, crenate-serrate, nearly 2 dm, long, acuminate 

 at the apex, acute but not attenuate at the base: rays 1.5 to 2 cm. 

 long: involucral scales ovate, narrowed to an obtuse apex, pubescent and 

 ciliate; heads numerous in an open corymb, showy: achenes frequently 

 more or less winged. — Biol. Cent.-Am. Bot. ii. 181. P. Tuerckheimii, 

 Klatt, Leopoldina, xx. 95. — Coban, Alta Vera Paz, Guatemala, altitude 

 1,300 m., von Tuerchheim, 1879 and 1886 (no. 336 of Mr. J. Donnell 

 Smith's sets). 



Var. strigillosa. Habit and all technical characters of the species, 

 but iDubesceuce of the stem and pedicels minute, appressed, strigillose. — 

 Zexmenia faseiculata, Coulter in J. Donnell Smith, Enum. PI. Guat. pt. 

 4, 86, not Gray. — Cenanguilla, Depart. Santa Rosa, Guatemala, altitude 

 1,200 ra., Heyde & Lux, no. 4244 of Mr. J. Donnell Smith's sets. Type 

 in herb. Gray. 



Excluded Species. 



P. ALBUM, Wats. Proc. Am. Acad. xxv. 154, is Calea scabrifoUa, 

 Benth. & Hook. f. 



The Peruvian plant of Matthews, mentioned by Bentham and Hooker 

 (Gen. ii. 377) as probably of this genus, has alternate leaves, sterile ray- 

 flowers, and other essential characters of a Vigulei'a. 



VOL. XXXIV. — 34 



