66 Professor Douglass and Dr. Torrey 
TeTRADYNAMIA. 
Arabis rhomboidea Pers. B. purpurea* Smooth: 
bulbosa Muu... root bulbous granulated 
leaves rhomboid ; the superior ones with large repand teeth, 
inferior ones in very long petioles, obsoletely toothed, cor- 
date. Flowers corymbose, pale purple, as large as in 
Raphanus sativus. About ten inches high. Cardamine 
rotundifolia Mx ? 
lyrata L. Banks of Lake Huron, June 5th. 
Dentaria yes Muhl. Wiild. Black Rock, May 3d. 
concatenate Mx. 
—diphylla Max. (Indian pepper.) In the same 
place. 
MONADELPHIA. 
Lobelia claytoniana Mx. Savannah Portage. 
DIADELPHIA. 
Prairies of the Upper 
atts below Sandy 
Lake. 
— villosum Nutt. Gen. 2. p. 65. Petals 5, nearly 
equal alternating with the stamens. Calyx five-toothed. 
Grows with the preceding species. First discovered by 
Nuttall on the banks of Knife River, near Fort Mandan, 
Missouri. 
Polygala paucifolia Muhl. Willd. Shores of Lake Hu- 
ron. 
Vicia Douglassu.* Spikes many flowered, somewhat 
retrorsely imbricated, shorter than the leaves; stipules 
ovate-lanceolate, entire, leaflets numerous, (5 to 6 pairs) 
ovate oblong, mucronate, slightly pubescent beneath. 
Resembles V. cracca. Sandusky Bay. May 8th. 
Pisum maritimum L. Sandy Point, Lake Superior, 
July 4th. 
Petalostenum violaceum Mx. 
Dalea violacea Wiuup. 
SYNGEN..SIA. 
Liatris squarrosa Willd. Stem erect, smooth, about two 
feet high. Serratula squarrosa L. Leaves very long and 
