OF THE WASATCH REGION 97 



6. A. villosa Rydb. Stem stout, hairy when young 1 , but be- 

 coming- nearly smooth; about 8 inches high. Leaves broadly 

 lanceolate, entire or laciniately toothed; rather thick; long- 

 hairy. Heads as much as an inch in diameter. Involucre 

 densely hairy; outer bracts oblong or ovate, the inner lance- 

 olate. Achenes brown; scarcely striate. 



5. TARAXACUM. Dandelion. 



Perennial herbs from a deep, thick tap-root. Leaves all 

 basal, forming a rosette; runcinate-pinnatifid or lyrate. Scape 

 naked and hollow. Flowers yellow; involucre reflexed at 

 maturity. Pappus soft and capillary, neither plumose nor 

 with a woolly ring- at base; in fruit expanded and raised on an 

 elong-ated beak. 



1. T. officinale Weber. (T. Taraxacum Karst; T. Dens- 

 leonis Desf.) Leaves usually triangular-lobed. Bracts linear 

 Achenes abruptly contracted into a conical or pyramidal apex, 

 which is prolonged into a filiform beak of 2 times the length 

 of the achene. On lawns and in waste places; a very trouble- 

 some weed. March-November. 



6. CREPIS. Hawks-beard. 



Annual, biennial or perennial herbs; glabrous or sparingly 

 tomentose. Leaves basal or alternate. Involucre of a single 

 row of equal bracts^ or sometimes with smaller ones at the 

 base. Flowers yellow. Achenes usually 10-20 ribbed or stri- 

 ate. Pappus copious; white and silky. 



Involucral bracts more or less tomentose. 



Bristly hairs glandular 1. C. occidcntalls 



Bristly hairs not glandular 2. C. scopulorum 



Involucre smooth and glabrous 3. C. acumiiiata 



1. C. occidental!** Nutt. Perennial; sparingly tomentose and 

 often glandular-hirsute above, especially the inflorescence. 

 Stems stout; branching-; one or several from a strong tap-root. 

 Leaves from runcinately-toothed to pinnatafid, more or less 

 crisped at the margins. Involucre with a set of small bracts 

 at base. Achenes from orange to brown, 10-18 striate. Dry 

 plains. May-June. 



2. C. scopulorum Coville. Perennial, 4-16 inches high. Stem 

 single, or rarely 2 from the same caudex, bearing 1-5 cymose 

 heads. Leaves rather firm; cleft almost to midrib, the di- 

 visions linear-lanceolate and deeply lobed or toothed. Achenes 

 usually olive-green and not ribbed at maturity. Dry hillsides, 

 usually near their summits. May-June. 



3. C. acuminata Nutt. Perennial; pubescence minutely 

 cinerous below. Stem usually single from a tap-root, un- 

 branched to the inflorescence; 1-3 ft. high. Leaves elliptical- 

 lanceolate in outline, laciniate-pinnatifid, slender-petiolecL In- 

 volucre narrow-cylindric. Flowers 5-10. Achenes beaked, 

 faintly striate. In lig-ht shade in rich soil on plains and in 

 mountain valleys. June-July. 



7. ANTENNARIA. Everlasting. 



Perennial, white-woolly dioecious or polygamous herbs. 

 Leaves basal or alternate, entire. Involucre of several rows 

 of white, pink or brown scarious scales. Heads small, the 

 flowers all tubular. Flowers whitish on a naked receptacle. 



