286 



CICHORIACEAE. 



[Vol. UI. 



10. Hieracium umbellatum L. Nar- 

 row-leaved Hawkweed. (Fig. 3570.) 



Hieracium umbellatum L. Sp. PI. 804. 175.^- 



Stem rather slender, glabrous or pubcrulent, 

 sometimes hispid below, usually very leafy 

 nearly or quite up to the inflorescence, usually 

 simple, i°-2>^° high. Leaves lanceolate or lin- 

 ear-lanceolate or the lowest spatulate, entire, 

 denticulate or sometimes laciniatedentate,acute 

 or acuminate, narrowed to a sessile base, I'-j' 

 long, 2"-(>" wide, glabrous above, mostly 

 somewhat pubescent beneath, the margins com- 

 monly ciliolate; no tuft of basal leaves at 

 flowering time ; heads few or several, corymbose, 

 about i' broad; peduncles rather stout, canes- 

 cent; involucres $"--" high, glabrous or 

 nearly so, its bracts imbricated in 2-3 series, the 

 outer spreading; flowers bright yellow; achenes 

 columnar, truncate; pappus copious, brownish. 



Lower St. Lawrence River to Ontario, Minne- 

 sota, Nebraska, British Columbia and Oregon. 

 Also in northern Europe and Asia. June-Aug. 



II. Hieracium Canadense Miclix. 

 Canada Hawkweed. (Fig. 3571.) 



H. Canadense Michx. Fl. Bor. Am. 2: 86. 1803. 

 Stemerect,firm,glabrateorpubescent,leafy, 

 i°-5° high. Leaves numerous, oblong-lan- 

 ceolate ovate-oblong, or lanceolate, acute or 

 acuminate at the apex, rounded, sessile, 

 and, at least the upper ones, clasping at the 

 base, I '-3' long, 3"-! 2" wide, serrate or 

 incised, the margins sometimes ciliolate, 

 glabrous or pubescent beneath, the lowest 

 somewhat spatulate and pctioled; no tuft of 

 basal leaves at flowering time; heads usually 

 numerous, corymbose-paniculate, about l' 

 broad; involucre about 6" high, pubescent or 

 puberulent, its bracts imbricated in 2-3 series, 

 the outer spreading; flowers yellow; achenes 

 columnar, truncate; pappus copious, brown. 



In dry woods and thickets. Nova Scotia to 

 Ontario and the Northwest Territory, south to 

 New Jersey and Michigan. July-Sept. 



12. Hieracium paniculatum L. Pan- 

 icled Hawkweed. (Fig. 3572.) 



Hieracium paniiulalum L- Sp. PI. 802. 1753. 



Glabrous throughout, or somewhat pilose-pu- 

 bescent below, stem paniculately branched above, 

 leafy, slender, i°-3° high. Leaves thin, lanceo- 

 late or oblong-lanceolate, acute or acuminate at 

 the apex, narrowed to a sessile base, or the lowest 

 into petioles, denticulate or dentate, 2'-5' long, 

 2^" -12" wide; no tuft of basal leaves at flowering 

 time; heads ^"-~" broad, commonly numerous, 

 corymbose-paniculate, 12-20-flowered, peduncles 

 slender, often drooping; peduncles quite glabrous 

 or sometimes glandular; involucre about 3" high, 

 glabrous or nearly so, its principal bracts in i se- 

 ries, linear, acute with a few very small outer ones - 

 at the base; flowers yellow; achenes columnar, 

 truncate; pappus brown, not very copious. 



In dry woods. Maine, Quebec and Ontario to Georfria, 

 Alabama and Kentucky. Ascends to 4600 ft. in Vir- 

 ginia. July-Sept. 



