RyDBERG: Rocky MounTAIN FLORA 57 
RHAMNACEAE 
Rhamnus betulaefolia Greene is to be added to the flora; it was 
collected in southeastern Utah in the summer of 1911 by Professor 
Garrett and myself. 
MALVACEAE 
Dr. Greene* in segregating Eremalche from Malvastrum made 
this statement: ‘‘and that there exists so much as one real Mal- 
vastrum north of the Mexican border, I hold to be doubtful.” 
A little investigation in the history of the genus would show 
that this statement is untenable. It is evident that Dr. Gray did 
not base his conception of the genus Malvastrum on the section 
Malvastrum of Malva of De Candolle, for this section contains 
the typical species of Malva also. 
The first subsection of this section of De Candolle’s is Chry- 
santhae, and some species of this subsection must be regarded as 
the type of Malva section Malvastrum DC. Of this subsection Dr. 
Gray remarked: ‘‘If the yellow flowered species with a somewhat 
different habit and usually a manifest persistent involucre, which 
forms a second section (the Chrysanthae DC., etc.), are correctly 
referred to this genus, it will comprise a large number of species 
_ from tropical and South America, which need an elaborate revision. 
I enumerate below merely the North American species which are 
known to me.”’ Furthermore, Dr. Gray did not include in his 
genus a single species of Malva given by De Candolle. This 
shows that Dr. Gray based his genus on the North American 
species and in publishing the genus he gave the name as ‘‘ MAL- 
VASTRUM Nov. Gen.,’’ without citing De Candolle’s section, al- 
though he had referred to it a few pages before in a footnote under 
Callirrhoe. As the type of the genus Malvastrum, therefore, we 
must desigate the first given binomial under Malvastrum, which is 
M. coccineum. Of the other species included in the original publi- 
cation M. Fremontii Torr., M. Wrightii A. Gray, M. grossulariae- 
folium (Hook.) A. Gray, M. angustum A. Gray, M. Munroanum 
(Dougl.) Gray, and M. spicatum (L.) Gray are plants of the 
United States. I agree with Dr. Greene that M. rotundifolium 
A. Gray and M. exile A. Gray should not be included in Malvas- 
* Leaflets 1: 207. 1906. 
