64 
A GENUS OF PLANTS INTERMEDIATE BETWEEN 
PETALOSTEMON AND PAROSELA 
In a part of the North American Flora now going through the 
press, there appears an unpublished generic name in the key. As 
the tribe to which it belongs is too large to be treated in a single 
part of said publication, and the description belonging to the 
generic name will follow in the subsequent part, which will not 
be published for a few months, it is necessary to publish the 
following technical notes and description in advance. 
Linnaeus in the first edition of his Genera Plantarum (1737) 
proposed a genus Dalea, but merged it later into Psoralea and it 
appeared as Psoralea Dalea in his Species Plantarum (1753). 
A. L. Jussieu resurrected the Linnaean genus in 1789, but in the 
meantime the same name had been used by several botanists for 
other genera, so that Dalea (L.) Juss. can not be maintained. 
Lately the name Parosela Cavanilles has been taken up for what 
was known as Dalea (L.) Juss. 
Michaux mistook a plant of the eastern United States for Psora- 
lea Dalea L., which was from Vera Cruz, Mexico. As double bi- 
nomials were not in vogue then, he proposed the name Dalea 
Linnaci in 1803. Willdenow, in the same year (apparently a 
little earlier) described the United States plant as Dalea alope- 
curoides, under which name it has usually been known, and pro- 
posed the name D. Cliffortiana for the Vera Cruz plant. The 
latter name has passed into oblivion. De Candolle, evidently 
' without thoroughly investigating the matter, united the two spe- 
cies. Following him, MacMillan, in 1892, proposed the com-~- 
bination Dalea Dalea, and Britton, in 1894, that of Parosela Dalea. 
Both applied it to the United States plant. 
Ventinat, in 1799, and Willdenow, in 1803, included in Dalea 
not only what has usually been known under that name, viz., the 
species of Parosela Cav., but also the known species of Petalo- 
stemon Michx. and Kuhnistera Lam. Most authors have united 
the latter two genera, but kept Dalea distinct. The characters 
used to distinguish Dalea and Petalostemon from each other are 
given in the New Gray’s Manual, page 501, in the best eondcaess 
form I know of, as follows: 
