283 



*lnvolucre of the fruit very thick, splitting freely nearly or quite to the base ; 

 middle lobe of the staminate calyx at least twice as long as the two lateral broader 

 ones ; seed sweet and delicious ; nut ridged and angular. 



f Leaflets 5 ; bark shaggy. 



(2.) H. OVATA (Mill). {Jughxns ovata. Mill., Gard. Diet., 

 No. 6, (1759); Juglaiis alba, Michx., Flor. Bor. Amer., ii., 193, 

 (1S03), not Linnaeus; Carya alba, Nutt.) 



(3.) H. Mexicana (Engelm.) Carya Mexicaiia, Engelm., in 

 Hemsley, Bot. Cent. Amer., iii.. 162). This I place here provis- 

 sionally, suspecting it to belong to this group, but staminate cat- 

 kins have not been described. 



f tLeaflets 7 to 9 ; (rarely, some leaves produce 5.) 

 |Bark close, foliage very pubescent and odorous. 



(4.) H. ALBA (L.). Jiiglans alba, L., Sp. Plant, p. 997, 

 (1753) ; Juglanstomentosa, Lam., Encyc. Meth., iv., 504, (1797) ; 

 Carya tomentosa, Nutt. Dr. Torrey has described a var. integ- 

 rifolia of this species in Bot. New York, ii., p. 182, t. 100, char- 

 acterized as having nearly entire leaflets and smaller fruit I 

 have not seen any specimens with as entire leaflets as those fig- 

 ured. 



Var. MAXIMA, (Nutt.). {Carya alba, Nutt., var. maxima, 

 Nutt, Genera, ii., 221, has fruit twice the ordinary size. Rafin- 

 esque called it H. maxima. (Alsog., 1. c.) 



X :j;Bark shaggy ; foliage puberulent. 



(5.) H. SULCATA, (Willd.). Juglans sulcata, Willd.,* Berl. 

 Baumzucht, p. 154, t. 7, 1796; Carya sulcata, Nutt Besides 

 the eastern stations reported for this tree we can add from Pro- 

 fessor Porter's Herbarium, Alexandria, Huntingdon County, and 

 Sellersville, Bucks County, Penn. 



**Involucre of the fruit thin, not splitting freely to the base ; lobes f of the 

 staminate calyx nearly equal in length, the lateral ones broader ; bark close. 



f Nut compressed-globular, or compressed-pyriform, smooth or slightly ridged. 

 :l:Nut small, thin-shelled : leaflets 5 to 7, smooth. 



(6.) H. MICROCARPA (Nutt) Carya microcarpa, Nutt, 

 Genera, ii., p. 221.) This must be regarded as a very critical 



*Casimir DeCandolle cites Duhamel as author of this name, but I have not 

 been able to find it in his writings. If he did describe the tree it was probably 

 before Willdenow's book was published. 



tin H. microcarpa the middle lobe is sometimes considerably longer than the 

 lateral ones. 



