424 JUGLANDACE.E. MyRICACE.E. 



those of the nut and falling away at maturity; nut with bony crustaceous shell (endocarp), 

 4-celled at base, 2-celled at apex ; seed lobed and variously grooved, oily and usually edible, 

 sometimes bitter. 



The name is from the popular name which is of American Indian origin. 



KEY TO THE SPECIES. 

 a Bud scales few, valvate ; sutures of fruit winged, lateral leaflets more or less lanceolate 

 and falcate. 

 b Nut compressed and kernel usually bitter ; shell 



Smooth and pale H. minima. 



Rugose, angled, chocolate-color H. aquatica. 



V Nut not compressed ; seed edible H. Pecan. 



a- Bud-scales numerous, imbricated ; lateral leaflets slightly if at all falcate, broader ; sutures 

 not prominent (or slightly so in H. villosa) 

 b Husk of fruit usually thick, splitting to base 



c Bark exfoliating in long loose plates — shaggy ; nuts whitish thick-shelled 



Leaflets mostly .3-5 and nut rounded at base H. ovata. 



Leaflets mostly 7-9 a.nd nut pointed at base H. laciniosa. 



c- Bark in close rough ridges, not shaggy : leaflets 7-9 : foliage fragrant and stellate- 

 pubescent ; nut usually 4-ridged and with thick brownish shell.. H. alba. 

 b'' Husk of fruit thin and usually not splitting freely to the base. 



c Fruit nearly glohDse and nut small with thin shell and bark of old trunks exfoliating 

 in long narrow strips 



Nut little flattened; middle lobe of staminate calyx short H. mierocarpa. 



Nut much flattened ; middle lobe of calyx long H. borealis. 



e= Fruit obovoid or pyriform with smooth thick-shelled nut : bark close 



Foliage glabrous or nearly so H. glabra. 



Foliage provided beneath with silvery peltate scales H. villosa. 



For species see pp. 52-69 and the foUoicing: 

 XoRTiiERx Hickory. H. borealis Ashe. This is a name recently given to certain small 

 Hickories found on dry uplands in Michigan near the Detroit River, which are allied to H. 

 iiiicrncdriiK. but differing from it mainly in having a longer middle lobe of the staminate 

 calyx and fruit more flattened, with very thin rugose husk usually not splitting. The extent 

 of their distribution is not yet determined. 



SWEET GALE FAMILY. MYRICACE.E. 



Small aromatic trees and shrubs with astringent bai'k and of about forty species grouped 

 in two genera only one of which is arborescent. They are of wide distribution throughout the 

 temperate and warmer regions of both hemispheres. 



Leaves simple, alternate, mostly resin-dotted and fragrant, revolute in the bud, persistent ; 

 buds small and scaly. Flowers in early spring in oblong aments from the exils of the leaves 

 of the previous year, dioecious or mona?cious, solitary in the axils of bracts ; perianth want- 

 ing ; staminate with 4 to several stamens inserted on the base of the scale with slender 

 filaments united at base ; anthers erect, introrse, 2-celled, longitudinally dehiscent : pistillate 

 flowers single or in pairs, with 1-celled ovary, short style, 2 filiform stigmas: ovule solitary, 

 erect, orthotropous. Fruit a small subglobose drupe covered with waxy exudation ; seed erect 

 with straight embryo, iilano-c(uivex cotyledons and no albumen. 



THE BAYBERRIES. Genus MYRICA L. 



Trees and shrubs of about seven species are represented in America and of these three 

 only are trees. One is confined to the Pacific coast region and the other two are inhabitants 

 of southeastern United States, one of these extending northward into Virginia or in shrubby 

 form farther north. 



Leares serrate, dentate or entire, exstipulate. mostly resin-dotted. Flou-ers: ovary 

 subtended bv 2-4 short bractlets. Fruit a small drupe covered with waxy exudations. 



The name Mi/rica, thought to come from a word meaning to perfume, is the ancient 

 Greek name of some fragrant shrub, and applied by Linna?us to this genus. 

 For species sec pp. 70-71. 



CORK-WOOD FAMILY. LEITNERIACE^. 



Small trees and shrubs of a single genus and species, with exceedingly light wood, of 

 southern United States and the valley of the St. Francis River in southeastern JNIissouri and 

 the valley of the Brazos River in Texas. 



Leaves .3-8 in. long, deciduous, alternate, petiolate, involute in the bud. oblong or 

 elliptic-lanceolate, acute or acuminate at apex, cuneate at base, firm, rugose-reticulate, at 

 maturity lustrous bright green above villous pubescent below as are the petioles and branch- 



