3S8 TRANS. ST. LOUIS ACAD. SCIENCE. 



Pag. 381. The following is believed to be a more correct enu- 

 meration and more natural arrangement of our oaks. 



I. Lepidobalanus, Endl. 



a. Leucobalanus. 



* Maturatio annua. 



t Folia decidua. 

 Q. alba, lobata (fruticosa*), Garryana, stellata, macrocarpa, 

 lyrata, bicolor (Mic/iauxii), Prinus, Miihlenbergii (prinoides), 

 Douglas//, undulata (pungent). 

 ft Folia persistentia. 

 £>_. oblong/folia, dumosa, reticulata, virens. 



** Maturatio biennis. 

 J^. chrysolepis (vacciniifolia, Palnieri), tomentella. 



b. MELANOBALANUSf : Ovula abortiva (excepta J^. Emoryi) supera, 

 etc., ut in pag. 381. 



* Maturatio arihua, folia persistentia. 



Q. Emoryi, agrifolia. piimila, hypoleuca. 

 ** Maturatio biennis. 

 t Folia decidua. 

 Q. rubra, coccinea (linctoria), Sonomensis, Jalcata, Catesbai, 

 ilicifolia, palustris. Georgiana, aquatica, laurifolia, nigra, cinerea, 

 imbricaria, P/iellos. 



j f Folia persistentia. 

 Q. Wislizeni, myrtifoliu. 



II. Androgyne, A. DC. 



£>_. detisiflora. 



ADDITIONAL NOTES. 



J£. lobata, Nee, has heretofore been known only as a large tree with 

 slender, even pendulous.branches, deeply lobed or pinnatifid leaves, the 

 lobes often retuse, notched or again lobed, pubescent below; with large, 

 long, conical-pointed (therefore longigla?ida, Torrey) acorns in a deep, 

 almost always strongly tuberculated cup. No essential variation of this 

 type has been noticed, unless we class a shrub-oak here, 2-6 feet high, 

 which Prof. Brewer found on the mountains west of Shasta, and Mr. Lem- 

 mon near the Tuolumne River. The foliage is the .same as that of lobata, 

 perhaps. smaller and even more deeply lobed, but the large oval acorns 

 have their base scarcely immersed in a very shallow cup ; cup 8-9 lines 

 wide, 3-4 high; acorn 12-15 lines high, sessile or (in the Tuolumne 



* The names in parentheses designate subspecie?. 



f The Black-oaks, many yaars ago. were grouped by Spach, and later by Liebmann and 

 others, under the name of Erythrobalanus (Red.oaks), but with other characters and other 

 limits than I assign them. 



