101 
cells apparently glandular (clammy) afford specific characters. 
There is added an account of our hybrid oaks, which are all (6) 
among the different species of Black-oaks. We give below the 
arrangement and syonomy, having, for convenience, somewhat 
changed its form. 
ee Quercos, L. 
I. Scaly cupped. Male aments pendulous; pollen-grains .03— 
-04 mm. broad; pistillate distant from staminate flowers; stigmas 
dilated. , : 
A, Wuairz-Oaks: Abortive ovules inferior or rarely lateral ; 
stamens generally 6-8; stigmas sessile or subsessile; inside of the 
shell smooth or very rarely pubescent. 
* Fruit annual; inside of nut smooth; abortive ovules inferior, 
+ Leaves deciduous. 
1. t Q. lyrata, 2. macrocarpa, 3. alba, 4. lobata, 5. stellata, 6. 
Garryana, 7. bicolor, 8. Michaucii, 9. Prinus, 10. Prinoides, 11. 
Douglasii, 12. undulata. 
+ + Leaves evergreen, . 
13. Q. dumosa, 14. Emoryi, 15. reticulata, 16. virens. 
* * Fruit biennial; inside of nut pubescent; abortive ovules inferior or lateral; leaves’ 
evergreen. : 
17. Q. chrysolepis. : 
B. Buack-oaxs: Abortive ovules superior; stamens generally 
4-6; styles elongated, at length recurved; inside of nut silky- 
tomentose. 
* Fruit annual; leaves persistent or subpersistent. 
18. Q. agrifolia, 19. hypoleuca, 20. pumila, 
* * Fruit biennial, 
+ Leaves deciduous. 
21. Q. palustris, 22. rubra, 23. Sonomensis, 24. coccinea, 25. 
ilicifolia, 26. Georgiana, 27. Catesbwi, 28. falcata, 29. nigra, 30. 
cinerea, 31. aquatica, 32. laurifolia, 33. heterophylla, 34. imbricaria. 
35. Phellos. 
+ + Leaves evergreen, 
36. Q. Wislizeni, 37. myrtifolia. 
II. Spiny cupped. Male aments erect, bearing pistillate flowers 
at the base; pollen-grains about .017 mm. broad ; stigmas linear. 
38. Q. densiflora. : 
The age of the fruit can be ascertained by examining the branchlet, whether it be of 
this year or the last. The abortive ovules may be found inside the shell and out-side of the 
seed coat, in the White.oaks at the base of the perfect seed, in the Black-oaks just below its 
tip. 
¢ SyNONYMs. 
_ 2. Q. obtusiloba, 8. depressa, Nutt.; Q. Oliveformis, Mchx.— 
3. Q. Prinus, var., Chap. and DC.—4, vars. palustris, monticola 
acuminata, Mchx.—12. Q, Gam belii, Nutt. ; and acon | Q. Drum- 
mondii, Liebm.; Q. alba, var. Gunnisoni, Torr.; Q. oblongifolia, 
Torr.; Q. pungens, Liebm. ?—13. Q. acutidens, Torr. ; Q. berberidi- 
folia, Liebm. ?—14. Q. hastata, Liebm. Often confounded with 12 
var. Wrightii—16. Q. maritima, Willd.—17. Q. crassipocula, Torr. ; 
Q. fulvescens and Q. vaciniifolia, Kellogg.—18. Q. oxyadenia, Torr. 
—19. Q. confertifolia, Torr.—20. Q. Phellos, var. pumila, Mchx. ; 
Q. cinerea, var. pumila, Chap., DC. ; Q. sericea, Willd., Pursh ; Q. 
Phellos, var. sericea, Ait.—22. Q. runcinata, Englm.—24, Q. tinctoria, 
Bart. ?—Q. quinqueloba, Englm.—37. Q. Phellos, var. arenaria, 
‘Chap. ; Q. aquatica, var. myrtifolia, A.DC. 
