ECONOMIC WOODS OF THE UNITED STATES 



135 



TABLE VII 



Indigenous Woods with Vessel Perforations Exclusively or Pre- 

 dominantly Simple 



Acerace^ 



Acer 

 Anacardiace^ 



Cotinus 



Rhus 

 Anonace^ 



Anona 



Asimina 

 Betulace.e * 



Carpmus 



Ostrya 

 Bignoniace^ 

 I Catalpa 



Chilopsis 



Crescentia 

 Boraginace^ 



Ehretia 

 Burserace^ 



Bursera 

 Cactace^ 



Cereus 



Opuntia 

 Capparidace^ 



Capparis 

 Caprifoliace^* 



Sambucus 

 Combretace^ 



Buceras 



Conocarpus 



Laguncularia 

 Ebenace^ 



Diospyros 



Ericace^ * 

 Arbutus 

 Arctostaphylos 



EUPHORBIACE^E * 



DrjTjetes 



Fagace.e * 

 Castatiea 

 Castanopsis 

 Fag us 

 Quercus 



HiPPOCASTANACEiE 



^^sculus 

 Juglandace^ 



Hicoria 



Juglaris 

 Laurace.e * 



Ocotea 



Persea 



Sass'-fras 

 Umbellularia 

 Leguminos^e 



Acacia 



Cercidium 



Cercis 



Cladrastis 



Dalea 



Eysenhardtia 



Gledilsia 



Gynuiocladus 



Icthyomethia 



Leucsena 



Lysiloma 



OIneya 



Parkinsonia 



Prosopis 



Robinia 



Sophora 



Zygia 



LeITNERIACEjE 



Leitneria 

 Magnoliace^ * 



Magnolia 

 acuminata 

 Meliace^ 



Sivietenia 

 MoracejE 



Morus 



Toxylon 

 Oleace^ 



Chionanthus 



Fraxinus 



Osmanthus 

 Polygonace^ 



Coccolobis 

 Rhamxace.e 



Ceanothus 



Colubrina 



Condalia 



Ivrugiodendron 



Reynosia 



ROSACE.E * 



Amelanchier 



Cercocarpus 



Chrysobalanus 



Crataegus 



Heteromeles 



Lyonothamnus 



Malus 

 Prunus 

 Sorbus 

 Vauquelinia 



RUBIACE.E 



Pinckneya 

 Rutace^ 



Amyris 



Fagara 



Helietta 



Ptelea 

 Salicace,e 



Populus 



Salix 

 Sapindace.® 



Exothea 



Hj-pelate 



Sapindus 



Ungnaria 

 Sapotace.e 



Bumelia 



Chrysophyllum 



Sideroxylon 

 Simarubace.e 



Ailanthus (Xat.) 



Simaruba 



TiLIACEiE 



Tilia 

 Ulmace^e * 



Ccliis 



Planera 



Ulnius 

 Zygophyllace^ 



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 obhque 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 oft 

 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 



