358 COMPOSITAE. 



petioles; cauline similar, sessile, 5-12 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 diff^erent 

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

 ful field study. 



Hieracium cynoglossoides Arv^et-Touv. Very similar to H. scoideri; 

 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, diff^ering 

 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- 



