STANDLEY — REVISION OF CICHORIACEOUS GENERA. 355 



Type locality: "In Virginia." The species was founded upon a plant described 

 by Gronovius. 



Distribution: Massachusetts, southward through Pennsylvania, Maryland, Vir- 

 ginia, North and South Carolina, Georgia, westward to Illinois, Missouri, Arkansas, 

 Oklahoma, and eastern Texas, and in Washington. 



Torrey and Gray recognized two species here, depending upon the shape of the 

 primary leaves for distinguishing characteristics. Among all the material that I 

 have examined I have been able to distinguish but a single species. The plants 

 change their appearance very materially as they grow older, and with the spring 

 and late summer forms before one it seems they must be distinct until one sees the 

 intermediate forms. The Washington plant, one collected between Olympia and 

 Gate City in 1898 by A. A. and E. Gertrude Heller, no. 4052, was deceptive on this 

 account. Coming from a locality so far distant from the common range of the species 

 and showing several apparent peculiarities, it seemed certainly distinct. After 

 examining the Missouri Botanical Garden material, however, it was seen that the 

 same form is found in the Central and Southern States. It seems probable that 

 the Washington plant was introduced into the locality where it was collected, for 

 we have only the single collection of it from west of Kansas. 



Krigia dichotoma Nutt. is the form with much branched stem; it develops in late 

 summer. Krigia leptophylla DC. seems to have been of similar origin. It was char- 

 acterized as having very narrow leaves, such as the plant develops late in the season. 

 Krigia petiolaris Raf., I think, belongs here. As far as the description informs us, 

 it might have been Cynthia montana, except for Rafinesque's statement that his 

 plant had small heads. The heads of Krigia are scarcely more than half as large 

 as those of Cynthia, and Rafinesque had seen both genera. 



3. CYNTHIA Don. 



Cynthia Don, Edinburgh Phil. Journ. 12: 305. 1829. 

 Luthera Schultz Bip. Linnaea 10: 257. 1835. 

 Type species: Tragopogon virginicum L. 



KEY TO THE SPECIES. 



Plants acaulescent 1. C. dandelion. 



Plants caulescent. 



Stems reclining, weak, and slender; leaves of the stem numerous. 2. C. montana. 

 Stems erect, much stouter; stem leaves only one or two pairs of 

 much reduced, often bract-like leaves. 



Upper leaves prominently aquiline-serrate 3. C. Jalcata. 



Upper leaves entire. 



Leaves glaucous. Of the eastern and central United 



States 4 . C. rirginica. 



Leaves bright green, not glaucous. Of the mountains 



of New Mexico and Arizona 5. C. viridis. 



1. Cynthia dandelion (L.) DC. Prodr. 7: 89. 1838. 

 Tragopogon dandelion L. Sp. PI. ed. 2. 1111. 1763. 

 tHyoseris major Walt. Fl. Carol. 194. 1788. 

 Ilyoseris angustifolia Michx. Fl. Bor. Amer. 2: 87. 1803. 

 Troximon dandelion Pers. Syn. PI. 560. 1807. 

 Krigia dandelion Nutt. Gen. N. Amer. PI. 2: 127. 1818. 

 Cynthia lyrata Nutt. Journ. Acad. Phila. 7: 68. 1834. 

 Cynthia boscii DC. Prodr. 7: 89. 1838. 

 Cacalia tuberosa Bosc; DC. loc. cit. 

 Adopogon dandelion Kuntze, Rev. Gen. PI. 304. 1891. 



