GOLDMAN—-PLANT RECORDS OF LOWER CALIFORNIA. 847 
up on the slopes of the Victoria Mountains to between 900 and 1,200 meters. Speci- 
mens were obtained as follows: Yubay, September 18 (flowers); San Bernardo to El 
Satiz, January 21; La Laguna to El Paraiso, January 29 (fruit). Recorded by Brande- 
gee from Jestis Marfa and San Pablo and in the Cape District. 
RHAMNACEAE. Buckthorn Family. 
Adolphia infesta Meisn. 
This well-armed and widely ranging species is common in places along dry arroyos 
at about 600 meters, on the west side of the San Pedro Martir Mountains. It grows 
as a shrub 1.5 to 2.5 meters high and appears to belong to the Upper Sonoran Zone. 
A flowering specimen was taken near San Antonio, August 1. 
Ceanothus goldmanii Rose.” 
Along the west slope of the Sierra del Pinal and San Pedro Martir mountains this 
abundant species is. associated in the Upper Sonoran Zone with G. submontanus. 
It was noted at elevations ranging from 840 meters on north slopes near La Huerta up 
to about 1,680 meters on the upper slopes of the Pinal Mountains and from 1,290 
meters between Pozo Luciano and El Pifiédn on open southwest slopes to about 1,950 
meters above Rancho Santo Toms in the San Pedro Martir Mountains. It was most 
abundant on warm slopes at about 1,500 meters, growing as a stout shrub 1.8 to 3.5 
meters in height and forming dense thickets. When one of the shrubs dies the branches 
have a peculiar habit of interlocking or knitting together at the tips, forming a spire. 
The type, in flower and fruit, was taken at La Huerta, June 2, and a specimen with 
empty seed capsules at El Pifién, July 5. The species passed as C. rigidus Nutt., until 
recently described as new. 
Ceanothus divaricatus Nutt. 
In the Transition Zone near La Grulla and along the road from La Grulla to Rancho 
Santo Tomas, in our descent of the San Pedro Martir Mountains, this shrub was noted 
in a number of places, sometimes associated with Arctostaphylos pringlei. It grows 
1.8 to 3.5 meters high. A specimen with ripening fruit was collected at La Grulla, 
July 20. The species is common in the same zone in the mountains of southern 
California, 
Ceanothus submontanus Rose.’ 
This recently described shrub, closely resembling C. ewneatus, ranges with C. 
goldmanii in the Upper Sonoran Zone on the western slopes of the Sierra del Pinal 
and San Pedro Martir mountains, but was less abundant than that species and not 
observed at so high elevations. It was noted at elevations ranging from 840 meters 
on north slopes near La Huerta up to about 1,650 meters near the summit of the Pinal 
Mountains and from 1,200 to 1,500 meters near El Pifién in the San Pedro Martir 
Mountains. It grows 1to 3 metersin height. The type, in fruit, was taken at Alamo, 
June 11, and a specimen with empty seed capsules at El Pifén, July 5. 
Ceanothus palmeri Trel. 
A specimen with empty seed capsules was taken near El Pifén, on the northwest 
slope of the San Pedro Martir Mountains, July 5. It was noted between 1,350 and 
1,500 meters on brush-covered hillsides, where C. submontanus and C. goldmaniu grew 
more abundantly, with other vegetation of the Upper Sonoran Zone. 
Colubrina glabra 8. Wats. 
Specimens of this shrub in flower and fruit were taken at 360 meters near Tinaja 
de San Esteban, 25 miles north of San Ignacio, October 5, and between 360 and 600 
See p. 311. 
