54 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
on a tracing of Mogino and Sessé’s and a specimen of Berlandier’s, for neither of 
which we have a definite locality given. From what we know of Berlandier’s field 
of exploration it seems probable he would have collected what is here called ( 
grandis, The species, however, is to be based upon the tracing, but in what part of 
Mexico the material was found from which it was made no one can tell. On 
account, therefore, of the uncertainty as to what the true C. disciflora is, it seems best 
to retain the name for the species which remains after the segregation of C. grandis. 
This species differs from C. grandis in the peculiar woolly pubescence on the under 
surface of the leaves. 
Common in deep canyons along streams on the top of the Sierra Madre. 
Collected by J. N. Rose, near Santa Teresa, August 10, 1897 (no. 2176), and in the 
State of Durango, August 18 (no. 2371); at San Nicholas, Valley of Mexico, 1865-66 
(no. 998). 
This species was also collected by Seemann, in the Sierra Madre, the exact locality 
not given, but probably near the first of the stations mentioned above. 
3. Cornus grandis Cham. & Schlecht. Linnea 5: 171, 1830, 
Type locality: ‘In sylvis prope Jalapam.”’ 
No material has been seen from the type region of this species. The writer has 
collected at Cuernavaca specimens which seem to belong here, although they come 
from a somewhat higher elevation, If this material is properly referred the species 
has a pretty wide distribution extending from the State of Michoacan to Oaxaca, and 
is generally found in collections labeled (. diseiflora. 
4. Cornus nelsoni Rose, sp. nov. 
Shrub, 12 to 24 dm. high; branches dark red, nearly smooth; leaves opposite, 
lanceolate, acute, rounded or sometimes slightly tapering or often oblique at base, 
6 to 10 em, long, 2 to 3 em. broad, dark green and slightly pubescent above, whitish 
and with appressed malpighiaceous hairs (as well as simple hairs in the axils of the 
veins) beneath; inflorescence an open cyme; flowers not seen; fruit white, very 
fleshy; stone slightly longer than broad (6 by 5 mm.), flattened, furrowed on the 
margin and with 3 fainter lines on each side. 
Collected by FE. W. Nelson on road between San Julian and Guadalupa y Calva, 
altitude 2,100 to 2,400 meters, September 7, 1898 (no. 4927). 
Very unlike all the species of Cornus heretofore reported from Mexico, 
Cornus excelsa H. B. K. Noy. Gen. & Sp. 3: 430. 1818 
Type locality: ‘‘ Inter Chalco et Urbem Mexici.”’ 
I have not examined the type of this species, but have collected in the Valley of 
Mexico near Humboldt’s station material which answers his description. This 
species is closely related to C. tolucensis; my material shows difference in pubescence 
and has broader and more oyate leaves and more spreading inflorescence. 
Specimens evamined: 
Federal District: On the Pedregal in the Valley of Mexico, Bourgeau, 1865-66 
(no. 55); also in the same region, C. G. Pringle, June, 1896 (no. 6305); in 
hedge near Tlalpam, J. N, Rose, July 18, 1901 (no. 5541). 
6. Cornus tolucensis H. B. K. Noy. Gen. & Sp. 3: 430. 1818. 
Type locality: ‘‘Juxta urbem Toluca.’’ 
I have not examined the type of Cornus tolucensis nor have I seen material from 
the type locality, but [ have collected material both to the north and south of Hum- 
boldt’s station, which is near the city of Toluca at an altitude of 2,800 meters. My 
specimens have narrow leaves, 6 to 25 mm. broad, gradually tapering into an acumi- 
nation and with appressed pubescence; inflorescence very compact, in flower almost 
head-like. 
Coliected by J. N- Rose near Santa Fe, Federal District, in Valley of Mexico, July 
11, 1901 (no, 5370), and near Tlapujahua, Michoacan, July 12, 1901 (no, 5402. ) 
