ECONOMIC WOODS OF THE UNITED STATES 



135 



TABLE VII 



Indigenous Woods with Vessel Perforations Exclusively or Pre- 

 dominantly Simple 



Ace race.*: 



Acer 

 Anacardiace^b 



Cotinus 



Rhus 

 Anonace^e 



Anona 



Asimina 

 Betulace.es " 



Carpinus 



Ostrya 

 Bignoniace.e: 

 I Catalpa 



Chilopsis 



Crescentia 

 Boraginace^e 



Ehretia 

 Burserace.*: 



Bursera 

 Cactace^; 



Cereus 



Opuntia 

 Capparidace^; 



Capparis 

 Capripoliace^b* 



Sambucus 

 CombretacejB 



Buceras 



Conocarpus 



Laguncularia 

 Ebenace^e 



Diospyros 



Ericace.e * 

 Arbutus 

 Arctostaphylos 



EuPHORBIACEiB * 



Drypetes 

 Fagace^e * 

 Castanea 

 Castanopsis 

 Fagus 

 Quercus 



HlPPOCASTANACE.dE 



JEsculus 



JUGLANDACE^! 



Hicoria 

 Juglans 



LAURACE.SI *" 



^)cotea 

 Persea 

 Sassafras 

 Umbellaria 

 Leguminos^s 

 Acacia 

 Cercidium 

 Cercis 

 Cladrastis 

 Dalea 



Eysenhardtia 

 Gleditsia 

 Gymrwcladus 

 Icthyomethia 

 Leucsena 

 Lysiloma 

 Olneya 



Parkinsonia 



Prosopis 



Robinia 



Sophora 



Zygia 

 Leitneriace^e 



Leitneria 

 Magnoliace^: * 



Magnolia 

 acuminata 



MELIACE.E 



Swietenia 

 Morace^; 

 Moms 

 Toxylon 



0LEACE2E 



Chionanthus 



Fraxinus 



Osmanthus 



POLYGONACE^! 



Coccolobis 



Rhamnace.*: 

 Ceanothus 

 Colubrina 

 Condalia 

 Krugiodendron 

 Reynosia 



Rosacea * 

 Amelanchier 

 Cercocarpus 

 Chrysobalanus 

 Cratsegus 

 Heteromeles 

 Lyonothamnus 



Malus 

 Primus 

 Sorbus 

 Vauquelinia 



RuBIACE^E 



Pinckneya 



RuTACE.® 



Amyris 

 Fagara 

 HeLietta 

 Ptelea 



SALICACE^i 



Populus 

 Salix 

 Sapindace* 

 Exothea 

 Hypelate 

 Sapindus 

 Ungnaria 



SaPOTACEjE 



Bumelia 



Chrysophyllum 



Sideroxylon 



SlMARUBACE^E 



Ailanthus (Nat.) 

 Simaruba 



TILIACE.3E 



Tilia 



ULMACEiE * 



Celtis 

 Planera 

 Ulmus 

 Zygophyllace^b 

 Guaiacum 



* With some tendency to scalariform, particularly in the region of primary wood. 



Scalariform perforations look like a grid-iron or grating with an 

 elliptical or elongated-elliptical contour. The bars, with very 

 rare exceptions, are arranged horizontally or transversely. As 

 the plane is almost invariably strongly oblique and facing the ray, 

 the structure is seen to much better advantage in radial sections 

 than in the transverse and tangential. Macerated material is 

 better still since a portion of the tilted plate is likely to be cut off 

 in sectioning. Bars may also be seen in the lumina of some of the 

 vessels in the transverse section, especially if the section is rather 

 thick. 



The number of bars in a perforation varies from very few to 



