Species of Oaks from North-west America. 255 



Quercus ohlongtfolia, or at least the form which I have sup- 

 l)Osed to be It, appears to belong, according- to (Ersted's recent 

 observations m his memoir on Q. agrifolia (Ora den krist- 

 tornbladedeEgfraCalifornien*), to his section ^fe^^omr/xm 

 ot the subgenus Enjthrohalanus of the restricted e-enus 

 Quercus. ° 



5. Quercus Jacohi, E. Br. Campst. 



I will not attempt in this place to do more than indicate 

 the above species ; for though it came under my notice as 

 early as 1863, through a curious concourse of accidents I have 

 never yet been able to obtain sufficient material for the publi- 

 cation of a complete diagnosis of the species. The only place 

 where I ever observed it was in the south-eastern district of 

 Vancouver Island, on the lawn and close to the house of Sir 

 James Douglas, along with trees of its close ally, Q.aarryana, 

 which afforded excellent material for comparison. The leaves 

 of the species under notice, instead of being long and with 

 three or four almost equal shallow lobes, acutely cut at the 

 bottom, and the leaf of about equal breadth throughout, was 

 more palmate, with five lobes, deeper and smaller than in Q. 

 Crarri/ana, the basal ones being broadest, the breadth of the 

 leal greatest at the middle. The form of the tree is also 

 different. Instead of, as in Q. Garri/ana, being bare of branches 

 lor about twelve feet, it branches out near the base, the 

 branching being much more umbrageous than in Q. Garryana. 

 1 was informed that the acorns were also different : and the 

 one comes into leaf and flower later than the other. Sir James 

 Douglas, who was at that time Governor of British Columbia 

 and Vancouver Island, had for many years noticed these 

 trees growing alongside of Q. Garryana, and was quite con- 

 vinced of the specific difference of the one to which, in me- 

 mory of his long and unvarying kindness to me and other 

 natm-alists during our exploration of North-west America 

 and m respect for the character of the founder of om- North- 

 Pacific colonies, I have attached his name. For the reasons 

 mentioned, I will not at greater length describe this species 

 or, at Jeast, marked variety ; but, as I hope to obtain in a 

 snort time sufficient materials for that purpose, I will postpone 

 this until these are put into my possession. 



In all, seventeen species of Cupuliferai find a place in the 

 flora of the region to the west of the Rocky Mountains, north- 

 ward of and including Upper California, which immense ex- 

 tent of territory, so varied in its climate and physical features, 



1869^'*^59'^^^' ^^•^^^^^^'^'' ^^ ^^^ Naturhist. Forening i Kjobeuliavn, 



