SUPPLEMENTARY. 



s . 



After page 3 of the text was in print I had an opportunity of observing for the iirst 

 time, the winter condition of Quercus Morehus^ and was not a little surprised at finding 

 its leaves all green and fresh as late as the end of February ; almost or quite the time for 

 the swelling of the spring buds. The tree is therefore not deciduous. The leaves are as 

 persistent as in the common Q. agrifolia. 



The group of trees above referred to was found by me in a new locality, at the north- 

 ern base of Mt. Tamalpais, in Marin County, California; and, inasmuch as both Q. Kel- 

 logii and Q. Wislizeni grow there, the former with Q. Morehus and the latter on the 

 mountain's higher slopes, the locality does not preclude possibilities of a hybrid origin ; 

 although the fact that the foliage is scarcely intermediate in point of texture or duration 

 still holds. 



Still later, even as late as the middle of March, I have come upon another growth of 

 Q. Morehus in a place where I had never thought of looking for it. This is upon the 

 very crest of the hills behind Berkeley ; forming part of a low thicket, which I had never 

 thought of examining because it was always understood that all these scrub-oak copses 

 were of Q. agrifolia; the only kind of oak heretofore observed on all this long range of 

 Oakland and Berkeley hills. The thicket of which Q. Morehus here forms a part, is of 

 an acre's extent, more or less ; and my attention was first drawn to the fact that the 

 middle part of this thicket was abruptly depressed, i. e., the bushes forming it being all 

 at once of only half the height of those on either side. The near view of this lower growth 

 revealed at once the peciiliar foliage of Q. Morehus; while upon one side of it the thicket 

 was all Q. agrifolia, on the other, all Q. Wislizeni. At this place and date all three 

 of the species were developing their early spring shoots with new foliage, all still retain- 

 ing the leaves of one or two preceding years. 



I may pretty confidently assert that Q. Kelloggi is not likely to be found within ten 

 or twelve miles of this spot. It certainly does not grow in the Berkeley or Oakland hills, 

 nor upon the low lands at either base of them. 



It is, in my mind, well established, that Q. Morehus is no hybrid, but a clear species, 

 most related to Q. Wislizeni, but differing from it constantly in habit as well as in the 

 whole outline and size of the foliage ; varying, as do most of our oaks, from a large tree 

 to a low shrub, according to the locality and surroundings. 



Berkeley, 25th March, 1889. 



