Quercus 1 2 1 7 



usually dentate. The introduced species are Q. glauca, Q. Vibrayeana, and 

 Q. acuta. 



* * Staminate flowers in erect, simple or panicled spikes. Styles terete, erect, 



stigmatic at the apex only. 



III. Pasania. 



Staminate flowers solitary or in cymes of two to five. Pistillate flowers, in 

 separate spikes or at the base of the staminate spikes. Fruit ripening in two 

 yea; -i ; cupule various, (a) completely enclosing the acorn and dehiscent 

 or indehiscent at maturity, (b) cup-shaped, with scales imbricated and free 

 at their apices, or (c) cup -shaped, with scales coalesced into concentric 

 zones. 



This section comprises about ioo species, all evergreen trees, with entire 

 or toothed leaves, mostly inhabiting eastern and south-eastern Asia and the 

 Malay Archipelago, one species (Q. densiflord) occurring in California. The 

 latter species and two from Japan, Q. glabra and Q. cuspidata, have been intro- 

 duced into cultivation. 



The following artificial key of the cultivated species of Quercus is based upon 

 the characters of the branchlets, leaves, and buds. 



I. Leaves deciduous in autumn, or early in the following year, falling before the new 



leaves appear. 



A. Leaves entire, with a bristle at the apex. 



1. Quercus Phellos, Linnaeus. United States. Seep. 1228. 



Branchlets glabrous. Leaves oblong or lanceolate, glabrous beneath, 2\ 

 to 5 in. long, about \ in. wide ; stalk \ to \ in. 



2. Quercus cinerea, Michaux. United States. Seep. 1230. 



Branchlets tomentose. Leaves lanceolate, white-tomentose beneath, 2 to 3 

 in. long, \ to \ in. wide ; stalk \ to \ in. 



3. Quercus imbricaria, Michaux. United States. See p. 1231. 



Branchlets glabrescent. Leaves lanceolate, with a greyish green stellate- 

 pubescent under surface, 4 to 6 in. long, 1 to 2 in. wide ; stalk \ in. 



B. Leaves lobed ; lobes and their teeth tipped with long fine bristles. 



* Leaves oblong, with short variable lobes. 



4. Quercus heterophylla, Michaux. A hybrid. See p. 1233. 



Branchlets glabrous. Leaves glabrous, except for axil-tufts beneath, 3 to 6 

 in. long, 1 to 2 in. wide ; stalk ^ to 1 J in. 



5. Quercus Leana, Nuttall. A hybrid. Seep. 1232. 



Branchlets stellate-pubescent. Leaves with scattered stellate pubescence 

 beneath, 5 to 7 in. long, 2 to 2^ in. wide ; stalk ^ to 1 in. 



6. Quercus nigra, Linnaeus. United States. Seep. 1235. 



Branchlets glabrous. Leaves extremely variable, oblong with three to seven 

 short lobes, obovate, or oval ; glabrous beneath, except for axil-tufts ; 3 to 4 in. 

 long, 1 to 2 in. wide ; stalk short, not exceeding in. long. 



V 2 F 



