64 



Onopordum (Vaill.) L. Cotton or Scotch Thistle. 



ACANTHIUM L. Amherst, H. L. Clark in Rhodora, Vol. I, p. 164. 

 Centaurea L. Star Thistle. 



Cyanus L. Bachelor's Button. 



NIGRA L. Knapweed. Spanish Buttons. Waste places, Hard- 

 wick, E. Hitchcock ; Amherst, etc. 

 Cichorium [Tourn.] L. Succory or Chicory. 



Intybus L. Common Chicory. Blue Sailors. Formerly rare 

 (1875), iiow quite common. 

 Krigia Schreb. Dwarf Dandelion. 

 virginica (L.) Willd. 

 amplexicaulis Nutt. Cynthia. 

 Leontodon L. Hawkbit. 



AUTUMNALis L. Fall DandcUon. " Arnica." One station noted 

 in 1875 ; now rather common in some localities. 

 Picris h. 



hieracoides L. Springfield, waste places, Mrs. M. L. Owen. 

 echioides L. Ox-tongue. Forest Park, Springfield, several plants 

 noted in 1S94, Mrs. M. L. Owen. 

 Tragopogon [Tourn.] L. Goat's Beard. 



porrifolius L. Salsify. Oyster-plant. Huntington, escaped from 



cultivation. 

 pratensis L. Huntington, Northampton, escaped from cultiva- 

 tion. 

 Taraxacum [Haller] Ludwig. Dandelion. 



OFFICINALE Weber. Troublesome on lawns. For many years 

 what is known as the French dandelion has been 

 cultivated on the Mass. Agr. College grounds, and 

 has escaped very freely into nearby fields. It pre- 

 sents very different characteristics from the type 

 even when escaped, and is susceptible to a mildew 

 (Podosphaera), differing in this respect from the 

 type. 

 officinale Weber, var. palustre (Sm.) Blytt. Springfield, L. An- 

 drews. 

 ERYTHROSPERMUM Andrz. Red-seeded Dandehon. Mass. Agr. 

 College grounds. 

 Sonchus [Tourn.] L. Sow Thistle. 

 ARVENSis L. Field Sow Thistle. 

 OLERACEUS L. Common Sow Thistle. 

 ASPER (L.) Hill. Spring-leaved Sow Thistle. 

 Lactuca [Tourn.] L. Lettuce. 



SCARIOLA L. Prickly Lettuce. Springfield, L. Andrews. 

 SCARIOLA L. var. INTEGRATA Gren. & Godr. Springfield, L. 

 Andrews. 



