22 PROCEEDINGS OF THE AMERICAN ACADEMY. 



elongated, sending off tough simple roots ; stem simple, 2 to 5 dm. high, 

 flexuous, covered throughout with long spreading hairs : basal leaves 

 2 to 3, oblong-lanceolate, rounded and apiculate at the apex, narrowed 

 at the base, 3 to 5 cm. long, 10 to 16 mm. broad, hirsute upon both 

 surfaces, paler beneath, glandular-denticulate: petioles nearly as long; 

 cauline leaves about 3, somewhat remote, oblong or oblauceolate, 

 obtusish to acute, denticulate, somewhat narrowed toward the sub- 

 clasping base : heads about 3 ; peduncles densely tomentose and bristly 

 with glandular hairs ; involucral scales dark colored, attenuate, glandular- 

 pubescent, in fruit 1 cm. long: corollas apparently white or very light 

 yellow: achenes reddish black, columnar, 3 mm. long; pappus in dried 

 specimens sordid white. — State of Mexico: valley of Mexico, BaUr- 

 geau^ no. 384 (hb. Gr.), Schaffner, no. 309 (hb. Gr.). Oaxaca : 

 Sierra de San Felipe, alt. 3000 m., Prinyle, no. .4715 (hb. Gr.), type. 

 Distinguished from the preceding by its fewer larger heads, and by the 

 stem, which is setose to the summit with hairs 2 mm. long. 



16. H. mexicanum, Less. Stems 1 to several, slender, 2 to 5 dm. 

 high, flexuous, sometimes branched, more or less hairy toward the base, 

 glabrous (to the unassisted vision) above or very finely tomentulose, 

 never setose ; caudex woolly-tufted at its summit : leaves essentially 

 confined to a basal rosette, thickish, oblong-lanceolate, obtuse to acute, 

 including the narrowed petiolar base 3 to 7 cm. long, 1 to 1.5 cm. broad, 

 more or less villous-pubescent upon both surfaces, much paler beneath, 

 glandular-denticulate ; cauline leaves none or 1 or 2, much reduced, 

 oblong-linear, acute: heads 3 to 10 to (rarely) 26, narrow, about 20- 

 flowered ; involucral scales dark colored, narrow, from smoothish to 

 tomentulose and minutely bristly -glandular : achenes 2 to 3 mm. long. — 

 Linnaea, v. 133 (1830) ; Fries, Symbol. Hierac. 139, & Epicris. Hierac. 

 149; Gray, Proc. Am. Acad. xix. 70, in part; Hemsl. Biol. Cent.-Am. 

 Bot. ii. 260. ? H. Lagopus, Don, Trans. Linn. Soc. xvi. 176 (1880); 

 Fries, Epicris. Hierac. 143. H. nireopappum, Fries, Symbol. Hierac. 

 139 (1848), J£. thyrsoideum plebejum, Fries, Symbol. Hierac. 142 

 (1848). H. praemorsifurme^ Sch. Bip. Bonplandia, ix. 174, 327 (1861). 

 H. malticaide, Schaffner ace. to Sch. Bip. Bonplandia, ix. 173 (1861) ; 

 Fries, Epicris. Hierac. 149 (1862). H. orizabaeiun, Arv.-Touv. Spicileg. 

 Hierac. 17 (1881), ex char. H. intybifunnia, Arv.-Touv. Ann. Con- 

 serv. Genev. 95 (1897). — Jalisco: between HuejiKjuilla and Mes- 

 (juitec, Hose (hb. U. S. Nat. Mus.). State ok JMexico: San Angel, 

 alt. 2440 m., Schaffnei- (hb. Gr.) ; Sierra de las Graces, ait. 2600 m., 

 Sdiaffner, Prill gle, no, 5322 (hb. Gr.); dry pine woods Nevada dc 



