358 COMPOSITAE. 



petioles; cauline similar, sessile, S— 12 cm. long; inflorescence corymbose or 

 paniculate, glandular; involucre 1 cm. high, very glandular and long-villous; 

 flowers yellow; akenes columnar; pappus fuscous. 



In open prairies; first collected at the mouth of the Columbia River by 

 Scouler; very variable in the amount and length of the pubescence. It is by no 

 means clear that the three following species are really valid as different 

 forms are not infrequently found growing close together. They deserve care- 

 ful field study. 



Hieracium cynoglossoides Arvet-Touv. Very similar to H. scouleri; 

 lowermost leaves more or less setose-hairy, the upper ones nearly glabrous; 

 involucre glandular and more or less hirsute with short black hairs. 



In open prairies, British Columbia to Wyoming and Oregon. 



Hieracium griseum Rydb. Very similar to H. cynoglossoides, differing 

 only in the leaves being densely hirsute as in H. scouleri. 

 In open prairies, with the same range as H. cynoglossoides. 



Hieracium cinereum Howell. Tufted from stout creeping rootstocks; 

 herbage cinereous with a minute tomentum; stems 15-25 cm. high, leafy only 

 toward the base; leaves lanceolate, acute to acuminate, sparsely hirsute, 

 denticulate, 7-10 cm. long; petioles broad; heads in a close cyme; involucre 

 8-10 mm. high; principal tegules linear, scarious-margined, covered with a 

 fine cinerous tomentum and bearing a row of short black bristles on the mid- 

 nerve; outer tegules few and short; pappus sordid. 



Table Rock, Clackamas County, Oregon, Howell. 



493. CREPIS. 



Annual, biennial or perennial plants with milky juice; heads 

 several-many-flowered ; flowers yellow ; involucre usually double ; 

 receptacle flat, naked, sometimes alveolate; pappus simple, of 

 copious and white capillary bristles which are not plumose; 

 corollas all ligulate; akenes oblong, linear or fusiform, nearly 

 terete or obtusely angled, 10-20-ribbed, generally contracted at 

 base and more tapering at the apex, sometimes slightly beaked. 



Akenes dilated at the insertion of the pappus; low glaucous 



plant with running rootstocks. C. nana. 



Akenes not dilated at the insertion of the pappus; plants with- 

 out rootstocks. 

 Foliage mostly white-pubescent, scurfy; perennial. C. occidentalis. 



Foliage green, not canescent nor scurfy; annuals or bien- 

 nials. 

 Involucres 6-8 mm. high; akenes 10-striate. C. capillaris. 



Involucres 8-12 mm. high; akenes 13-striate. ' C. biennis. 



Crepis nana Richards. Glabrous and somewhat glaucous; stems tufted 

 from creeping rootstocks, branched from the base, 3-5 cm. high; leaves obovate 

 to spatulate, entire, toothed or lyrately lobed, 2-5 cm. long, long-petioled; 

 heads solitary or few, on naked peduncles or stems; involucre cylindric; tegules 

 8-10, linear, obtuse; flowers 8-14, yellow, turning pink; akenes linear, slightly 

 fusiform, beakless, 10-striate. 



In rocky soil, at high altitudes in the mountains, rare; Olympic Mountains, 

 Flett; Mount Adams, Suksdorf. 



Crepis occidentalis Nutt. Perennial, erect, thinly white-tomentose through- 



