264 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Flowers yellow or yellowish. 

 Plants with naked stems, the leaves all at the base of the scapelike peduncles these 

 usually bearing each a single head. ' 



Roots hearing tubers; leaves glabrous; bracts all of equal length. . 2. CYNTHIA 

 Roots without tubers; leaves usually more or less hairy; brad very unequal 

 Plants with leafy, usually branched stems. 4 " LE °NTODON. 



Bracts all of equal length. Plants annual. . 3 toucta 



Bracts very unequal, the lowest much smaller and shorteVthan't'he other* 

 Achenes short-spiny at the apex; flower heads sessile or nearly so; stems at flow- 



enng time bearing only a few linear entire leaves 6. CHONDRILLA 



Achenes never spiny; flower heads conspicuously stalked; stems usually with 

 numerous well-developed leaves. 

 Flower heads drooping, their stalks recurved. Pappus pale or dark brown; 

 plants tall and coarse, the leaves often deeply lobed . .6. FRENANTHES 

 Slower heads erect, never drooping. 



Achenes strongly compressed; teeth of the leaves often tipped with weak 

 spines. 



Flowers 50 or more in each head, yellow, the heads few; achenes not 



Fln v beak , ed ": ■•; 7. SONCHUS. 



I lowers 6-30 in each head, yellow or blue, the heads usually very numer- 

 ous; achenes usually beaked at the apex. . 8 LACTTTCA 

 Achenes not compressed; leaves mostly entire, the teeth, when present not 

 Spine - tl ^ d 9. HIERACIUM. 



1. CICHORHJM L. 

 1. Cichorium intybus L. 



izelinlhTaS tiVat6d gr ° Und ! C ° mm0n - JUDC - AUg - KatiVG ° f Eur - ; -^ly naZl 



A form with white flowers is found occasionally. The roots of chicory have often 

 been used as a substitute for coffee. 



^P^^rnunis L., nipplewort, was collected about Washington in 1884 and 

 1915. Native of Eur.; sparingly adventive in the U. S. 



Tragopogon porrifolius L., salsify, was reported by Ward from Uniontown and by 

 Holm from Eckmgton. Native of Eur. ; commonly cultivated for its edible roots, and 

 frequently escaping. Known also as oyster plant. 



2. CYNTHIA D. Don. 



1. Cynthia dandelion (LO DC iw»« 



p - „ . , ;.,;., Dwarf goat's-beard. 



Pine woods or open hillsides about Washington and Alexandria; infrequent. May- 

 June. Eastern U. S. (Krigia dandelion Nutt. ; Adopogon dandelion Kuntze ) 

 The leaves are usually toothed or lobed, but sometimes they are entire. 



3. KRIGIA Schreb. 

 1. Krigia virginica (L.) Willd. 



Open fields and on rocks; frequent. Apr.-Aug. Eastern U. S. (Adopogon caro- 

 hnianum Bntton.) r * 



Apargia autumnalis (L.) Hoffin. (Leontodon autumnalis L.), fall dandelion was col- 

 lected in the Zoological Park, September, 1897 (W. Hunter); native of Eur and 

 Asia; naturalized locally in the northeastern U. S. A. hispida (L.) Willd. (Leontodon 



2™ V' TT? haWkWt ' native ° f Eur - was collected at Ammendale, May, 

 1916 (Brother Arsene). 



Hypochaeris radicata L., cat's-ear, was collected at Ammendale, June, 1916 (Brother 

 Hyacinth). Native of Eur. ; widely naturalized in the XL S. 



