ROBINSON AND GREENMAN. — HIERACIUM. ' 19 



The material at hand shows coucliisively the inconstancy of the charac- 

 ters u|)()n which H. tolncanum was founded. 



8. H. Lemmoni, Gray. Habit, stature, and foliage as in the pre- 

 ceding; inHorescence thyrsoidal ; peduncles tomentulose, without dark 

 hairs — Troc. Am. Acad. xix. 70 (1883), & Syu. Fl. i. pt. 2, 430.— 

 Arizona : Bear Spring, Cave Canon, Lemmon, no. 2803 (lib. Gr.) ; 

 Santa Rita Mountains, Pringle (hi). Gr.). Doubtfully distinct from the 

 preceding. 



9. H. Rosei, n. sp. Perennial, about 5 dm. tall, branched from below 

 the middle ; stem purple, densely spreading-hirsute with long grayish 

 slightly detlesed hairs: leaves about 5, chiefly cauline, 5 to 6cm. long, 

 about half as broad, ovate-oblong, obtuse, undulate and (ofteu obso- 

 letely) cuspidate-denticulate, sparsely villous, somewhat paler beneath : 

 panicle lax, the lower branches long and naked from the axils of ovate- 

 oblong obtuse foliaceous bracts ; pedicels filiform, pale-tomentulose, his- 

 pidulous ; heads about fifty ; involucre narrowly campanulate, 8 to 

 9 mm. long, nigi-escent, externally subappressed-pubescent : achenes pur- 

 plish black, slender, slightly tapering upwards, 4 to 4.5 mm. long; pappus 

 white, becoming sordid. — Teimc : in the Sierra Madre between Santa 

 Gertrudis and Santa Teresa, 8 August, 1897, Dr. J. N. Rose, no. 2080, 

 in part (hb. U. S. Nat. Mus., tracing and fragments in lib. Gr.). Readily 

 distinguished from the related species by its short and broad leaves. 



■»--<--'- Adienes 2 to 3 mm. long. 

 ++ Stems decidedly leafy ; leaves large (8 to 12 cm. long). 



10. H. Rusbyi, Greene. Stem erect, 3-4-leaved, 6 dm. high, 

 covered to the middle with spreading villous pubescence, nearly glabrous 

 above ; leaves lance-oblong, nearly entire, villous upon both surfaces, 

 acute, the cauline sessile by broad amplexicaul base : branches of the 

 loosely corymbose inflorescence minutely flocculent-tomentose, neither 

 they nor the pale bracts- (12 to 14 in number) of the narrow cylindric 

 involucre hispid: heads about 23-flowered. — New Mexico : MogoUan 

 Mountains, Rushy (hb. Gr.). Chihuahua : about 64 km. from Guada- 

 lupe y Calvo, alt. 2450 m., Nehon, no. 4816 (hb. U. S. Nat. Mus.), Mt. 

 Mohinora, Nelson, no. 4897 (hb. U. S. Nat. Mus). 



11. H. Wrightii, n. comb. Stem tall and stout, fistulose, 4 to 9 dm. 

 high, very hirsute to the summit, 5-9-leaved ; caudex stout, comose : 

 basal leaves oblanceolate, narrowed to a long petiolar base, glaucescent, 

 obsoletely glandular-denticulate, villous-hirsute upon both surfaces ; cau- 

 line leaves lance-oblong, attenuate : panicle many-headed ; the peduncles 



