424: Jugla:\'dace.e. ]\Iyki<_'ace.e. 



rliosc of the nut ami falling away at maturity; nut ^Yith bony crustaceous shell (endocarp i , 

 4-celle(l at base, 2-cellecl at apex; seed lobed and variously grooved, oily and usually ediblr. 

 sometimes bitter. 



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



KEY TO THE t^l'EClES. 

 a Bud scales few, valvate : sutures of fruit winged, lateral leaflets more or le.ss lanceolate 

 and falcate. 

 b Nut compressed and kernel usually bitter ; shell 



Smooth and pale H. minima. 



Rdgose, angled, chocolate-<olor H. aquatica. 



b- Xut not compressed ; seed edible H. Pecan. 



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

 not prominent (or slightl.v so in H. rillosa) 

 b Husk of fruit usually thick, splitting to base 



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



Leaflets mostly ?•■'> and nut rounded at base H. ovata^. 



Eeaflets mostly 7-!l and nut pointed at ba.se H. laciniosa. 



c- Bark in close rough ridges, not shaggy ; leaflets 7-0 ; foliage fragrant and stellate- 

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

 b^ Husk of fruit thin and usually not S]difting freely to the base. 



c l-'niit nearly globos-e and nut small with thin shell and bark of old trunks exfoliating 

 iu long narrow strips 



Xut little flattened; middle lobe of staminate calyx short H. microcarpa. 



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



c" Fiuit 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 xiK-cies see pp. 52-69 and the folloiDing: 

 XORTitEHN HiCKOEY. H. IjoreuUs 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. 

 iiiicroearpn. 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.^. 



Small aromatic trees and shrubs with asti'ingent bark 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 hemisi)heres. 



Lrar'x simple, alternate, rflostlj' 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, dia>cious or monoacious, 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, plano-convex cotyledons and no albumen. 



THE BAYBERRIES. Genus jMYRICA L. 



Trees and shrubs of aliout seven species are represented in Amerira 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 shruliby 

 form farther north. 



Lrarr.i serrate, dentate or entire, exstipulate, mostly resin-dotted. FJntrers: ovai-y 

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



The name Myricn. thought to come from a word meaning to perfume, is the ancient 

 Greek name of some fragrant shrub, and applied by Linnaeus to this genus. 



For species see 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 Jlissouri 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, cnneate at base, firm, rugose-reticulate, at 

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



