125. CoMPOsiTAE 273 



4. Stem and leaves glabrous; flowers purplish; moist ground, 



nearly throughout 111. Aug.-Sept P. raceniosa Michx. 



4. Stem and lower sinface of leaves scabrous-pubescent; flow- 

 ers light yellow; prairie soil, locally throughout 111. Aug.- 

 Sept. [P. illinoensis Pers.] P. aspcra Michx. 



3. Stem corymbosely branched above; heads 20- to 35-flowered; 

 flowers cream; banks of streams and edges of woods, locally 

 throughout 111., except the extreme northern counties. Aug.- 

 Oct P. crcpidinca Michx. 



69. Hieracium L. — Hawkweed 

 1. Plants with stolons and slender rhizomes. 



2. Flowers orange-red; Helds and meadows, occasional; nat. from 

 Eur.; Lake and Ogle counties. June-July. Orange Hawk- 

 weed H. (lurantiacum L. 



2. Flowers yellow; nat. from Eur.; Cook Co H. pratensc Tausch 



1. Plants with short stout erect rhizomes; stolons none; flowers 



yellow. 



3. Heads medium or small, 1-2 cm in diameter; leaves entire or 



denticulate. 

 4. Lea\es and lower part of stem densely long villous-hirsute 

 with brownish or whitish hairs 1-2 cm long; achenes 



fusiform; fields and open woods, local. July-Sept 



H. longipiium Torr. 



4. Leaves and stem with shorter pubescence. 



5. Inflorescence with foliaceous bracts, the heads 40-50- 

 flowered, on stout peduncles; achenes columnar, trun- 

 cate, 2-2.5 mm long; dry woods and fields, locally 

 throughout 111. Aug.-Sept. [H. scabrum var. intoiisum 



Fern. & St. John] H. scabrum Michx. 



5. Inflorescence with small subulate bracts, the heads 15-20- 

 flowered, on slender peduncles; achenes fusiform, taper- 

 ing toward the apex, 3-3.5 mm long; dry soil in woods, 



local. July-Sept H. gronovii L. 



3. Heads large, 2.5-4.5 cm in diameter; leaves dentate. 



6. Stem leafless or nearly so; basal leaves elliptical, dentate 

 toward the base, the petioles villous; peduncles and 

 bracts with stalked glands; pappus white; fields and waste 

 places; adv. from Eur.; Springfield, Sangamon Co., G. D. 

 Fuller & Lola Carter in 1947. June-Aug. Golden Hiera- 

 cium H. muroruni L. 



6. Stem leafy; leaves numerous, lanceolate, sessile; peduncles 

 tomentulose; pappus brownish; dry woods and thickets 

 in the northern counties. Aug.-Sept. Canada Hawkweed 

 H. canadense Michx. 



70. Crepis L. — Hawksbeard 

 C. capillaris (L.) Wallr. Occasionally fouutl in waste places, or 

 in lawns; adv. from Eur. June-July. 



