.XVII. JUGLANDA CEiE : PTEROCA RYA. 



Genus III. 



743 



PTEROCA^RYA Kunth. The Pterocarya. Lin. Syst. Monoe'cia 



V Polyandria. 



Identification. Kunth in An. Sciences Naturelles, 2. p. 346. ; Lindley Nat. Syst. of Bot., p. 180. 

 Synonyme. Jiiglans sp. hin. 



Derivation. Ptcron, a wing ; karua, the common wahiut. The fruit has wings ; and, except in 

 these, resembles tliat of the walnut. 



Gen. Char., S^c. Flowas unisexual, monoecious. IMale flowers in spikes. 

 Stamens in a flower many. Female flowers in long pendulous spikes, and 

 distant, sessile, and without bracteas. Calyx connate with the ovary. 

 Ovary and part ot" the calyx flagon-shaped, bearing two wings above the 

 base ; their direction transverse and oblique; cell 1 ; ovule 1, erect. Style 

 1, very short. Stigmas 2, large, spreading, revolute. Fruit sub-drupa- 

 ceous, angled ; having two wings, as the ovary ; much tapered to the tip, not 

 opening ; containing a bony nut, which has 4 cells in its lower part, whose 

 partitions do not extend to the top. (G. Don.^ 



Leaves compound, alternate, exstipulate, deciduous ; leaflets about 17, 

 sessile, unequal at the base, not dotted, serrate. Fruit small. ' Decaying 

 leaves brown. A tree, deciduous ; native of the eastern part of Caucasus; 

 propagated by layers, but the plant is somewhat tender. 



1J 1. P. cauca'sica Kunth. The Caucasian Pterocarya. 



Identification. Kimth in Annal. des Scien. Nat., 2. p. 346. 



Synonyiiies. Jdglans Pterocarya Michx. Fl. Bor. Amer. i. p. 192., Mey. Verz. Fflamc. Cauc. p. 134. 



iihus obscQrum Bieb. Fl. Taur. Cauc. No. 606.; J. fia\im{iy\ia LamoTid AIS., N. Du Hani. i. 



p. 18'2. ; Fraxinus laevigata Hurt. Far. 

 Engravings. Out fig. 1431. from a seedling plant ; the plate of this tree in Arb. Brit., 1st edit., vol. 



vii. ; and^g. 1432. from a plant in the Hoiticultural Society's Garden. 



1431 P. cauc^ca. 



Spec. Char., t^'c. Leaflets, in a leaf, about 19 ; ovate-oblong, acuminate, 

 argutely serrate, glabrous ; each with the lower or hinder side of its base 

 attached to the petiole. {Lamarck.) A low deciduous tree. Mount Caucasus, 

 in moist woods. Height 20 ft. to 40 ft. Introduced in ? l&OO. Flowers 

 greenish ; May. 



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