- 828 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
high. Specimens in flower and fruit were collected as follows: Calamahué, Septem- 
ber 15; El Potrero (about 5 miles southwest), October 31; road from Cerro Colorado 
to Rodriguez, December 16; San José del Cabo, January 6; Espfritu Santo Island, 
February 7. 
RANUNCULACEAE. Crowfoot Family. 
Thalictrum peninsulare (T. S. Brandeg.) Rose. 
Common in the oak forest on cool, moist, northerly slopes above about 1,500 meters 
altitude on the Sierra de la Laguna. This familiar-appearing plant was associated 
with a number of others whose habitat is above the Lower Sonoran Zone and which 
are therefore isolated here on the mountain tops. A specimen with leaves only was 
taken at about 1,650 meters near La Laguna, J anuary 29. This was the first time we 
had observed the genus Thalictrum since leaving the San Pedro Mértir Mountains. 
Brandegee records this plant as common at middle elevations in the mountains south 
of La Paz. 
BERBERIDACEAE. Barberry Family. 
Berberis gremontii Torr. 
This species was found rather sparingly in the Upper Sonoran Zone at the lower 
end of Trinidad Valley and in open arroyos up to about 1,500 meters altitude near 
El Pifién on the northwest slope of the San Pedro Martir Mountains. It grows here 
as a shrub 1.8 to 3 meters high. A specimen with leaves only was collected in 
Trinidad Valley, June 16 and one with fruit near El Pifién, July 7. Brandegee records 
it growing in great rounded patches 3 meters high at San Sebastién and Rancho 
Viejo. 
CAPPARIDACEAE. Caper Family. 
Atamisquaea emarginata Miers. 
On the shore of the bay near La Paz we found this species flowering February 3. 
It was also seen occasionally along the route to Cape San Lucas growing as a shrub 
1.8 to 3.5 meters high. It was collected by Palmer at Mulegé in 1887 and by Bran- 
degee at San Gregorio in 1889. The species has also been recorded from the oppo- 
site side of the Gulf of California at Guaymas and near Hermosillo, Sonora, by Bran- 
degee, who refers to it as “that disagreeable bush.’’! 
Forchammeria watsoni Rose. Pato SAN JUAN. 
The ‘“‘palo San Juan,”’ as this species is called by the people, occurs rather spar- 
ingly in the Cape District near San José del Cabo and on Espiritu Santo Island, as 
also on the coast of Sonora. It is a thick-trunked tree 4.5 to 7.5 meters in height, 
spreading abruptly to form an umbrella-shaped top. On Espfritu Santo Island a few 
individuals were growing on steep rocky slopes 30 to 60 meters above sea level, A 
fruiting specimen was taken February 7. 
Isomeris arborea Nutt. 
Abundant in sandy places near Ensenada and on the coastal plains from near San 
Telmo southward at least as far as the San Simén River. Specimens in fruit and 
flowers were collected at Ensenada, May 20, and near San Quintin, August 2, 
Wislizenia palmeri A.-Gray. 
An abundant species along arroyos or in the vicinity of water at San Francisquito 
and Calamahué, growing as a shrub 1.2 to 1.8 meters high. Specimens in flower and 
fruit were taken at Calamahué, September 15. The species belongs in the Lower 
Sonoran Zone. 
1 Zoe 8: 344. 1893. 
