820 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
San José del Cabo loaves of raw sugar, called “panocha,’’ are made by pouring hot 
sirup in molds cut in slabs of huirigo timber. This well marked species of Populus 
was described by Brandegee from the Sierra de la Laguna and is not known to occur 
elsewhere. 
Populus fremontii S. Wats. FREMONT COTTONWOOD. ALAMO, 
Rather common along arroyos at 1,350 to 1,500 meters along the boundary between 
the Upper Sonoran and Transition zones, near El Pifién on the northwest slope of 
the San Pedro Martir mountains. Populus trichocarpa also was found along one 
stream in the vicinity; but the two species were not associated in the same situations. 
At San José del Cabo, where it may have been introduced, we found P. Sremontti a 
common species, It grows here near sea level in the vicinity of the town and is 
known locally as “élamo.’’ A specimen collected January 6 was in flower. Bran- 
degee records the species as introduced at La Purfsima and Comandu, but perhaps 
indigenous at San Enrique. 
Populus macdougalii Rose. ALAMO. MACDOoUGAL COTTON Woop. 
This species has recently been recognized and described ! as distinct from the delta 
region of the Colorado River. The trees grow most abundantly in belts along the 
complicated series of ever shifting river channels. When we descended the river on 
the crest of the spring flood in 1905, the soft alluvial banks were being very rapidly 
undermined in places, involving the destruction of the cottonwood timber along the 
water. We often noted first a slight quivering of the topmost branches of tall trees, 
which then toppled and fell into the stream, one after another, and were swept away. 
Dense new growths of small cottonwoods, mixed with willows, spring up in old river 
channels which have filled and become blocked with silt. 
Populus trichocarpa Torr. & Gray. BLACK COTTONWOOD, 
At about 1,350 meters altitude, close along the course of a stream about 10 miles 
southwest of El Pifién, on the west side of the San Pedro MA4rtir mountains, we found 
this species abundant. It was not noted elsewhere. It forms here a rather small, 
but relatively tall, very straight tree with a long tapering spire. Compared with 
some specimens of trichocarpa from farther north the stems of this form seem more ; 
slender and the leaves smaller and more pointed. We have seen no other record 
of this species from Lower California. 
Salix lasiolepis Benth. AHUEJOTE. 
This willow was noted by us only along the banks of a small stream at 1,650 meters 
at La Laguna, near the summit of the Sierra de la Laguna. It appears to belong to 
the Upper Sonoran Zone, growing here as a tree 7.5 to 9 meters in height. Thenew 
leaves and flowers were coming out January 27, as shown by our specimen. The 
species is recorded by Brandegee from Rosario. 
Salix exigua Nutt. SANDBAR WILLOW. 
The only record obtained of this little willow was at Arroyo de Leén, on the north- 
west slope of the San Pedro Martir Mountains. Here, at an elevation of about 900 
meters, a few individuals were growing in a wet meadow along a small stream ag small 
shrubs 1.8 to 2.5 meters high. A flowering specimen was taken July 4. 
Salix bonplandiana Kunth. Satz. BoNPLAND WILLOW. 
This willow is moderately abundant along streams in the Cape District south of 
La Paz at elevations varying from near sea level up to at least 450 meters on the south- 
* Smiths. Mise. Coll. 61%: 1. 1913. 
