FAG ACE A E 



349 



Leaf-blades with rounded broad sinuses ; lobes usually 

 dilated near the apex. 

 XX Inner scales of the cup inflexed. 

 ft Cup of the acorn turbinate or hemispheric. 



Acorns less than 15 mm. long ; cup hemispheric, less than 1.5 



mm. broad. 

 Acorns over 20 mm. long ; cup turbinate, over 15 mm. broad. 

 ** Leaf-blades pubescent beneath. 



Cup of the acorn turbinate : leaf-blades brown- or rusty-pubescent 



beneath. 

 Cup of the acorn saucer-shaped : leaf-blades gray- or white-pubes- 

 cent beneath. 

 Large trees : leaves with lanceolate lobes. 

 Leaf-blades rounded at the base ; lobes 3-5. 

 Leaf-blades cuneate or truncate at the base ; lobes 5-13. 

 Shrubs or small trees : leaves with triangular lobes, 

 b. Leaves persistent. 

 B Fruit maturing the first season : stems underground, the branches erect. 

 Leaf-blades, or their teeth or lobes without bristles (except on shoots): nuts often 

 glabrous within. 

 Leaves persistent. 



Stems underground, the branches upright. 

 Stems erect. 



Leaf-blades prominently rugose-reticulated : cup of the acorn turbinate. 

 Leaf-blades not rugose-reticulated : cup of the acorn hemispheric (ex- 

 cept i n Q. fuf'iformis ) . 

 Leaf-blades entire (or sometimes spiny-toothed on shoots): nuts fusi- 

 form to ovoid, over 18 mm. long and 9 mm. thick. 

 Acorns less than twice as long as thick ; cup hemispheric ; nut ovoid 



or oblong-ovoid. 

 Acorns over twice as long as thick ; cup turbinate ; nut fusiform. 

 Leaf-blades sinuate-toothed : nuts cylindric or oblong-cylindric. less 

 than 18 mm. long and 9 mm. thick. 

 Leaves deciduous. 



Leaf-blades entire or sinuate-undulate or merely lobed at the apex. 

 Cup of the acorn saucer-shaped. 



Leaf-blades pubescent beneath : cup thin and with a thin edge : nut of 



an obovoid type. 

 Leaf-blades glabrous : cup thick and with a thick corky edge : nut of 

 an oblong or ovoid type. 

 Cup of the acorn hemispheric. 



Young leaf-blades white beneath ; mature leaves glabrous, prominently 



lobed near the apex. 

 Young leaf-blades tawny beneath ; mature leaves pubescent beneath, 

 irregularly lobed of merely angulate. 

 Leaf-blades coarsely" toothed or lobed. 

 Leaf-blades toothed or shallowly lobed. 

 Acorns sessile. 



Shrubs or small trees : leaf-blades mostly broadest above the middle. 

 Cup saucer-shaped : margins of the leaf-blades irregular. 



Leaf-blades pubescent beneath : cup thin and with thin edges: 



nut of an obovoid type. 

 Leaf-blades glabrous : cup thick and with a thick corky edge : 

 nut of an oblong or ovoid type. 

 Cup hemispheric : margins of the leaf-blades regular. 

 Tall trees : leaf-blades mostly broadest below the middle. 

 Acorns peduncled. 



Peduncles shorter than the petioles or about equalling them. 

 Bark close, dark-colored : leaf-blades gray-tomentose beneath. 

 Bark flaky, white : leaf-blades glabrous or white-tomentose 

 beneath. 

 Leaf-blades leathery, densely pubescent beneath, with many 



lateral nerves and many relatively small teeth. 

 Leaf-blades membranous, glabrous, with few lateral nerves 

 and few large teeth. 

 Peduncles much longer than the petioles. 

 Leaf-blades prominentlv or deeply lobed. 



Mature leaf-blades more or less pubescent beneath : cup fully J^ as long 

 as the nut. 

 Upper scales of the cup awned, forming a fringe around the nut. 

 Upper scales of the cup not awned. 



Acorn broader than high ; nut immersed in the cup or nearly so. 

 Acorn longer than broad ; nut about % longer than the cup. 

 Leaf-blades obovate, gray or yellowish beneath, with 3-5 ample 

 dilated lobes. 

 Leaf-blades with rounded upper lobes : cup 11-14 mm. 



broad : nut 12-14 mm. long. 

 Leaf-blades with truncate or emarginate upper lobes 

 1-5-20 mm. broad ; nut 1.5-20 mm. long. 

 Leaf-blades cuneate, brown or yellowish brown beneath 

 3-7 low never dilated lobes. 

 Mature leaf-blades glabrous and pale, or glaucous beneath: cup shallow. 



: cup 



with 



11. Q. Schneckii. 

 13. Q. Catesbaei. 



14. Q. Texana. 



15. Q. coccinea. 



16. Q. velutina. 



17. Q. digitata. 



18. Q. pagodaefoUa. 



19. Q. nana. 



20. q. myrtifolia. 



21. Q. pumila. 



22. Q. minima. 



23. Q. geminata. 



24. Q. Virginiana. 



25. Q. fusiformis. 



26. Q. undidata. 



27. Q. Durandi. 



28. Q. Laceyi. 



29. Q. austrina. 



30. Q. Chapmanii. 



31. Q. breriloba. 



28. Q. Laceyi. 



32. Q. prinoides. 



33. Q. acuminata. 



34. Q. Prinus. 



35. Q. Michauxii. 



36. Q. Brayi. 



37. Q. platanoides. 



38. Q. 7nacrocarpa. 



39. Q. lyrata. 



40. Q. Margaretta. 



41. Q. minor. 



42. Q. Bnyntonii. 



43. Q. alba. 



1. Quercus Ph611os L. A tree, reaching a maximum lieiglit of about 25 ra. and a 

 trunk diameter of 1 m., sometimes evergreen, the bark of the trunk nearly smooth. Leaf- 

 blades linear-oblong or narrowly-elliptic, varying to lanceolate or oblanceolate, 4-10 cm. 



