COMPOSITAE (COMPOSITE FAMILY) 601 



very large, pale and thin, before the flowering almost equaling the inner and 

 nearly concealing them, under the mature fruit relatively shorter, oblong, 

 lanceolate, narrowed toward the summit, then again dilated into an ovate 

 tip; inner bracts narrowly linear-lanceolate, with a dilated and bifid tip: 

 achenes distinctly compressed, olive-green, spinulose at summit, otherwise 

 smooth, or the 2 prominent angles and intervening ribs variously tuberculate 

 or somewhat muricate; beak thrice the length of the achene. (T. ceratophorum 

 and T. latilobum DC., as to our range; T. oblanceolatum A. Nels. in Herb.) 

 Common in the mountains; from Colorado to British America. 



5. Taraxacum angustifolium Greene, 1. c. 232. Glabrous throughout; 

 crown of the root usually much-branched and the leaves and scape numerous: 

 leaves oblong-linear, 8-15 cm. long, 1-2 cm. wide, obtuse or mucronately 

 acute, sharply and remotely denticulate to coarsely dentate, the teeth all sim- 

 ple, opposite, seldom runcinate: scapes rather slender, slightly decumbent, 

 in maturity twice the length of the leaves: involucres rather narrow and 

 few-flowered, the outer bracts few and small, in a single series, or at least 

 scarcely biserial, broadly lanceolate to oblong, erect: achenes chestnut-brown, 

 spinulose-muricate at summit, smooth and obtusely costate from above the 

 middle to the base ; beak about thrice the length of the achene. T. leiospermum 

 Rydb. Bull. Torr. Bot. Club 32: 137. 1905.) Subalpine meadows; Colorado 

 and Wyoming. 



6. Taraxacum ammophilum A. Nels. ex Greene, Pitt. 4: 233. 1901. Stout- 

 ish, but multicipital and depressed, the leaves and numerous decumbent 

 scapes only 5-10 cm. long; herbage wholly glabrous: leaves oblong or spatulate- 

 oblong, acutish, evenly but not strongly runcinate-toothed : outer involucral 

 bracts in a single and even scanty series, thin and pale, oval to ovate-lanceolate, 

 erect ; the inner narrowly lanceolate, the tips slightly and somewhat scariously 

 dilated : achenes distinctly though not strongly compressed, dark red-brown, 

 muricate at the acute summit, the 4 principal angles tuberculate below, the 

 intervening ones similar except as being less prominent; stipe of pappus 

 nearly thrice the length of the achenes. Creek banks in the mountains; south- 

 ern Wyoming. 



