ROBINSON AND GREENMAN. — HIERACIUM. 15 



from some recently secured tracings and fragments of Lessing's species 

 preserved in the Royal Botanical Museum, at Berlin. From these new 

 sources and a very full suite of excellent modern specimens collected by 

 Messrs. Pringle, Palmer, Nelson, L. C. Smith, Conzatti, Gonzalez, Rose, 

 Pittier, Brandegee, and others, it is now possible to offer the following 

 synopsis with a reasonable confidence that it will prove a useful basis for 

 further work in its particular field. For the sake of comparison a few 

 species, which are at present known only in the southwestern United 

 States but are likely to extend within the boundaries of Mexico, are 

 here included. 



HIBRACIUM, TouRX. (Name from Upd$, a hawk.) — A large 

 and in Europe exceedingly difficult genus. The Mexican and Central 

 American species erect perennial herbs with scapiform or leafy stems, 

 alternate lance-linear to oblong or obovate, dentate or entire pinnately 

 veined leaves and corymbose or paniculate heads; involucral bracts 

 unequal, narrow, unaltered after anthesis, usually pubescent to bristly 

 hirsute dorsally : corollas orange to lemon yellow, greenish white or 

 rarely flesh-colored : achenes slender and cylindrical or attenuate from 

 near the base toward the summit ; pappus copious, bright white to sordid, 

 tawny, or rufous, of simple subequal bristles. — Inst. 469, t. 267 (1700); 

 L. Syst. (1735), & Spec. 799 (1753) ; Fries, Symbol. Hierac. (1848), 

 & Epicrisis Ilierac. (1862) ; Sch. Bip. Ueber die Hieracien Amer- 

 ika's, Bonplandia, ix. 172 (1861) ; Benth. & Hook. I Gen. PI. ii. 516 

 (1873); Ilemsl. Biol. Cent.-Am. Bot. ii. 259(1881); Arvet-Touvet, 

 Spicilegium Hierac. (1881), Rev. des Epervieres & Elenchus, Ann. 

 Conserv. Genev. 1.68(1897); Gray, Proc. Am. Acad. xix. 65 (1884), 

 & Syn. Fl. i. pt. 2, 424 (1884) ; Peter in Engl. & Prantl, Nat. 

 Pflanzenf iv. Ab. 5, 375 (1894) ; Hook. f. & Jacks. Ind. Kew. i. 1149 

 (1893), which see for generic synonymy. 



* Pubescence of the leaves scanty to very copious, sometimes silky or hirsute, 

 but not woolly or matted. 



-1- Achenes fully 5 mm. in length, conspicuously tapering almost from the base to 



the summit. 



1. H. Fendleri, Sen. Bip. Stems 1 to 3, erect, 26 to 52 cm. high, 

 hirsute with long fine widely spreading or slightly reflexed bristles, or 

 glabrate : basal leaves 3 to 14, oblanceolate to obovate, acute to rounded 

 and apiculate at the apex, cuspidate-serrulate, attenuate below, 5 to 12 

 cm. long, 17 to 60 mm. broad, covered on both surfaces and at the margin 

 with long sparse hairs (bronze color in dried specimens) ; cauline leaves 



