IIaa'i>i!ook of Ti;kj-;s of tiu-: ^'oi;.tiif,i;n Statk.s and ( 'anada. 443 



jviiles sevoral, sus|ii'ii;]i-.l. I'niil a glabrous (-(impiesscil linear mai'sinefl tardily dehiscent 

 legume, containini;- liw oloru- Munpiessed seeds with slender ftuiicle and no albumen. 

 Name formed from (irerk rodts meaning hrittle hrancltcs. 



For fipccits scr pp. ^'.l^-^^US. 



THE LOCUSTS. Genus RoHIXlA L. 



Trees and shriilts \\ith slender zi.iza,:^^ branf.'hlets and niinnte sn)"ierposed bnds covered 

 liy the eularKed basrs nf Ihe petioles. 'They are conhned lo North America. Seven or eisht 

 species are known, of which four are represented in the T'nited States, three arborescent ami 

 one shrubby. 



Liiinx ileciduous. uneoually ]dnnati< and with spinescent persistent stipules; leaflets 

 entire, petiolnlate with minute bristledike stiiiids. FUnrrrs in racemes from the .axils of 

 the lea\es of the yrar wiih caducous bracts and bradlcts; calyx c.impauulate, ."i-tootlied, 

 the upper pair shorter and somi'what united; corolla iiapilionaceous with large reflexed 

 obcor<late standaril. ubloug cur\ed fiee \^■inis and iibtiise inciii\"cl keel-petals united belo\\' ; 

 stamens 1(1, the 1) inferior united and one supruaor free at least tii liasc ; antiiers uniform or 

 every other one smalliu'; ]iislil superior, slipitate with sniiulatc inflexed hairy style and ter 

 minal stigma: o\"ules numei-nus. sus])ende(l from Ihe \eiilial sutnie in Iwo ranks. Fniit: iiods. 

 compressed, linear-nblnug. tlat-margined along the sr-cddiearing sntni'c. -\^-ith 12 thin meni- 

 braunns \al\cs and cnntaining sc\cral nbliipic ]-i>nif'n-m seeds with pi-'rsistent iniau'\"cd funicle, 

 fleshy cotyh'.lons and retlexcil radicle. 



Till' genus is named in honiu' of .Tean and \'asijasean Itoliin, father and son, herbalists to 

 Henr\" lY. King of l^'rance, who tirst culti\ate.l iln- Lixaist tree in Europe, 



KEY TO THE SPEtTES, 



Flowers white ; branchlels and jioils glabrous R. Pseudacacia. 



Flowers pinkish : br.inchlets and pods glambdardiispid R, viscosa. 



Fur sprcirs src pp. .,-'.''} ,.'.')T. 



RUE FAMILY. RL'TACE-E Juss. 



An important family of trees and shrubs with jiuugent or aromatic properties, widely 

 distriliuted througheuit warm and tiunperate regions. .'s]iecially of the Old World, and most 

 abnmlant in South Africa and Australia. About eigld luindred eighty species, grouped in 

 one hundred ten genera, are recognized, but only five of the genera are represented in the 

 I'nited States, this number including Citnix (the Bitter-sweet (Trange, etc) of Florida. 



Lcorcf compound (sometimes simple) usually glandular-iuincta(e, without sti]iules or 

 with stipular siiines, F/oin ;■.■.■ regular, i.erfect or unisc'iual, ^enerall\- in cynes ; e.ilyx wilh 

 ?,-:< lobes imbricated in the bud; petals I-!-."!, hypogynous or perigynous, imlu'icati'd in the bud; 

 stamens as many as the petals or twice the number, distinct cu- united below and inserted on 

 the receptacle ■ 'anthers introrse, longitiulinally dehiscent; pistils 2-.o, separate or united, 

 sessile ni- ^fiidtate the styles usualh- united and ..vary containing 2 pednlous anatropoas or 

 air) li ■ic|Hins ovules. Fruit usually' a caiisule but in other cases a samara or drupe; seed 

 with leu-ny lU- crustaccons <'oat ami containing an axile embryo in fleshy albumen, 



KEY TO THE OEXEKA. 



Fruit a 2-valved capsule; leaves pinnate..., Xanthoxylum. 



Fruit a samara winged all around ; leaves trifoliate i-telea. 



THE PRICKLY-ASHES, Genus X-\XTH(^XYLU}>I L, 



Trees and shrubs of ahciit one hundred species, with prickly twfgs and of wide distribu- 

 tion in tropical and (emperate regions. Five s,,ecies are found in the Fnited States of which 

 ane is a shrub and the otliers small trees mainly of the southern stab'S. The bark, especially 

 of the roots of all tlie re•presentati^■es of llie genus contains active stininlant and tome prop- 

 ei-ies and is used in the treatment of rheumatism, to ex, ale salivation and to relieve toothache. 



Tnnr<! allcrnale. odd-pinnate, the leaflets generally opposite, oblu|ue at base and entire 

 nr cr enubite /•7.orcr,. small, whiti.sh or greenish, in axillary or terminal peduiiculalc c.^■mes_; 

 .ei-n 4- ,;,■ cbsidele' petals d-" ; stamens 4-.- and alternate with the petals ; pisi ,1s U-.,, 

 I, ti.eiire- nviries distinct 1-celled, 2-oviiled; stvie short, shmder and connivanr, 



F;':/;"a . ll' with n'o ,lnckl;^i Valves and containing 1-2 ohhmg seeds with smooth Wack 

 shinin- eVuVta.'eous testa, and often hanging from the open cannd at maturity suspended by a 

 slemU-T funicie; cotyledons foliaceous. 



The name is from two Greek words meaning inltini ii nmt. 

 For species see pir .'iil^-.-'JO. 



