Vot. III.] 



CHICORY FAMILY. 



283 



(b) Principal bracts in 1 series; heads small, paniculate or racemose. 

 I . Achenes columnar at maturity, truncate. 

 Plant nearly or quite glabrous; heads 15-20 flowered. 12. H. paniculatum. 



Plants scabrous or glandular; heads 15-50 flowered. 



Peduncles stout, spreading; no tuft of basal leaves at flowering time. 13. H. scabrum. 



Peduncles slender, ascending; basal leaves present at flowering time. 8. H. Marianum. 



2. Achenes spindle-shaped, or with a tapering summit at maturity. 



14. H. Gronovii. 



15. H. longipilum. 



Leaves and lower part of the stem pilose. 



Leaves and stem densely clothed with very long brown hairs. 



i. Hieracium Pilosella L,. Mouse-ear Hawkweed. (Fig. 3561.) 



Hieracium Pilosella L. Sp. PI. 800. 1753- 



Stoloniferous, pilose-pubescent throughout; stolons 

 leafy, rooting, slender, 3 / -i2 / long. Scape slender, 

 erect, 4 / -io / high, leafless, with a single head; leaves 

 oblong or spatulate, entire, obtuse or acutish at the 

 apex, narrowed into petioles, often white-tomentose 

 beneath, i}4 / ~3 / long, 4 // -S // wide; head i / broad 

 or more; flowers yellow; principal bracts of the in- 

 volucre in 1 or 2 series, linear, acuminate, pubescent, 

 usually with 1 or 2 exterior ones; achenes oblong, 

 truncate; pappus a single row of slender bristles. 



Dooryards and fields, Ontario, New York, Pennsylva- 

 nia and Michigan. Adventive from Europe. Called also 

 LingGowans, Felon-herb, Mouse Bloodwort. May-Sept. 



Hieracium Pilosella Peleterianum Mer. Nouv. Fl. Paris, 



Ed. 2, 230. 1821. 

 Stolons shorter, thick; plant silky-pubescent. Fields 

 and roadsides, Prince Edward Island. Naturalized from 

 Europe. 



2. Hieracium murdrum I,. Wall 



Hawkweed. (Fig. 3562.) 



Hieracium murorum L. Sp. PI. 802. 1753. 



Stem pubescent or glabrate, simple, or with 1 or 

 2 branches, i-2^ high. Basal leaves thin, ovate 

 or oblong, obtuse or acute, cordate or truncate at 

 the base, or abruptly narrowed into petioles, 

 coarsely dentate or laciniate, at least near the base, 

 i'-\' long, i / -2 / wide, the petioles villous; stem 

 leaves 1 or 2 (sometimes none), short-petioled or 

 sessile; heads 2-several, corymbose, about i / broad; 

 peduncles ascending, usually glandular; involucre 

 4 // -5 // high, its bracts linear-lanceolate, acute, 

 glandular-pubescent, imbricated in 2 or 3 scries; 

 achenes columnar, truncate; pappus of slender 

 nearly white bristles. 



Woodlands near Brooklyn, N. Y. ; about Quebec. 

 Adventive or fugitive from Europe. Called also 

 French or Golden Lungwort. June-Aug. 



3. Hieracium vulgatum Fries. Hawkweed. 

 (Fig. 3563- ) 



H. tnolle Pursh, Fl. Am. Sept. 503. 1S14. Not Jacq. 1774. 

 U. vulgatum Fries, Fl. Hall. 128. 1817-18. 



Similar to the preceding species, sometimes taller 

 and slightly glaucous; stem 2-5-leaved, pubescent or 

 glabrate. Basal leaves oblong or lanceolate, acute at 

 both ends, or some of them obtuse at the apex, 

 coarsely dentate or denticulate, pctioled, 2 / -5 / long, 

 yi'-t-Vz' wide, stem leaves similar, short-petioled or 

 sessile; petioles more or less pubescent; heads several, 

 corymbose, smaller than those of H. murorum or as 

 large; peduncles mostly glandular, straight; bracts of 

 the involucre imbricated in 2 or 3 series, linear, acum- 

 inate, mostly glandular; achenes columnar, truncate; 

 pappus copious. 



Labrador and Newfoundand to Quebec, and in southern 

 New York and New Jersey. Probably introduced. Also 

 in Greenland, northern Europe and Asia. July-Sept. 



