498 FLORA OF TEXAS. 



globose heads ; calyx and corolla none ; anthers on short 

 club-shaped filaments, numerous, 2-celled, aduate to the 

 truncated connective; ovaries numerous, obconical, hairy 

 at the base ; ovules 1-2, orthotropous, pendulous ; style 

 subulate; nut 1-seeded; seed cylindrical; embryo in the 

 axis of scarce fleshy albumen ; floiuers intermixed with 

 copious club-shaped scales. Consisting of scales. 



PLATANUS, L. Plake-tree ; Sycamore. 



P. occiDENTALis, L. Lcavcs (4-9' wide) round-cor- 

 date, angularly lobed and toothed, covered when young 

 with dense whitish down, soon smooth; 5^i;j?«Ze5 toothed ; 

 heads pendulous (8"-12" in diameter). Kiver-banks. March 

 and April. A large tree, Avith the white bark separating 

 in thin plates. 



119. WALNUT FAMILY. Order, Juglandace^. 



Trees, with alternate odd-pinnate exstipulate leaves and 

 monoecious apetalous or minutely petaled floioers ; sterile 

 flowers in pendulous aments; calyx 2-6-parted, the sta- 

 mens few or numerous ; fertile flowers single or clustered; 

 calyx 3-5-parted, the tube adherent to the incompletely 

 2-4-celled oxavj ; fruit drupaceous, with a bony endocarp; 

 seed 4-lobed, without albumen, orthotropous; cotyledons 

 oily, 2-lobed ; radicle short, superior 



GARY A, Nutt. Hickory; Pignut. 



Aments of the sterile floioers mostly three together, on a 

 common peduncle, lateral ; calyx unequally 3-parted ; 

 stamens 3-6 ; fertile floioers terminal ; calyx 4-partecl ; 

 petals none ; stigma large, 4-lobed ; mit smooth, 4-G-an- 

 gled, incompletely 4-celled; the coriaceous epicarp (husk) 

 partly or completely 4-valved. — Trees, mostly with scaly 

 buds ; leaflets serrate ; fruit roundish. 



