EXOGENS. 129 



AiLANTO, AiLANTHUs. Pls. J> g 9 . JFr. a samara. Deoid. trees ; 

 Ivs. imparipinnate. Few spec, Asia. A. glandulbsa, 50° his;h, Ivs. 

 2°-3° long, fls. green. Common. 2. Simariiba. ¥ls.^,^^. Fr. 

 1-5 drupes. Lvs. imparipinnate. Evergreen trees. Few spec. W. 

 Ind., trop. Am. S. ^rJawca, fls. green. Large tree, S. Fla., Cuta. 3. 

 Qu&ssia. Fls. SJ , large, red ; pet. 5. Fr. 5 drupes. Lvs. imparipin- 

 nate. Q. amdra, lofty evergreen tree; wood bitter, medicinal, made 

 into Qiiassia-cups. Surinam. 4. Suriana marUima, monotypic. Fls. 

 g , small, yellow, in terminal racemes ; pet. 5. ■ Fr. 5-carpelled. Lvs. 

 simple, linear-spatulate, fleshy. Maritime coasts, nearly all tropics ; 

 S. Fla. 



Ord. 117. Rut^cese. — 83 gen., 650 spec, both worlds. 7 Tribes, in 

 2 Sections : 



Sec. 1. Ova. entire or slightly lohed. Style terminal. Berry or 

 drupe. 



Tribe 1. Fls. g, reg., white, fragrant, clustered. Sta. double or 

 multiple the petals, free or mon- or polyadelph. Berry yellow, rarely 

 red, usually edible. Lvs. 1-3-foliolate or pinnate. 13 gen., ev. trees 

 or shrubs, trop. Asia, E. Ind., few in trop. Af., Australia. A. Lvs. 

 1-foliolate. Petals 'usually 5, rarely 4. 1. Citrus. Trees, usually 

 spiny. C. Aurantium, Orange. Mandarin, Tangerine, are small- 

 fruited varieties. C. medica. Citron ; fr. large, rind very thick. C. 

 Limbnum, Lemon, Fig. 127. C. Limetta, Lime. C. Bigarddia, Bit- 

 ter Orakge. C. decumdna. Shaddock, Pamplemousse ; fr. very 

 large, weighing 10-20 lbs. 2. Atalantia monophglla. Wild Lime ; 

 berry V in diam. ; wood yellow, valuable. 3. .ffigle Mdrmelos, Ben- 

 gal Quince. {Mdrmelos, its Ind. name ; original of our Eng. word 

 Marmalade.) Berry as large as an orange, delicious. • B. Lvs. pinnate 

 or S-foliolate. Petols 5-4-3. 4. Feronia elep/idnium. Elephant 

 Apple ; monotypic ; large tree ; fr. large, delicious. 5. Clausena, 

 trees, shrubs; berries small Several spec, Asia, Africa; one, C. 

 bi-evisiylis, Australia. 6, Cookia. Trees, shrubs; several spec, Asia. 

 C. punctata, Wampkb ; berries small, edible. China, E. Ind. 7. 

 Luviinga, petals 4-5. Several spec ; spiny climbers, lvs. 3-foliolate. 

 Ind. 8. Triphasia trifoHdta, monotypic Pet. 3, lvs. 3-foliolate ; 

 berries small, edible. Spiny shrub, S. China. 



Tribe 2. Fls. reg., often (^ g ?'c2, ?• Shrubs, trees, usually 

 trop. Several gen. 1. Skimmia. Fls. 4-merous, small, white, 

 fragrant; panicled; drupes small, red. Lvs. simple. Evergreen 

 shrubs, N. Ind., Japan. 2. Ptelea, Shritbby Trefoil, Hop Trkb. 

 Fls. (^ § 9 , white, fragrant ; cymose ; pet. 4-5. Samara broad. 

 Shrubs, small trees ; lvs. simple or .3-5-foliolate. Few spec, N. Am., 

 Asia. P. trifolidla, lvs. decid.', 3-foliolate. 6°-10° high. U. S. 



See. 3. Ova. deeply 2-5-lobed. Styles basal or ventral, free or con- 

 nate by the stigmas. Fr. a boll ; or 3-5 cocci, endocnrp separating. 



Tribe 3. Disk free or 0. Fls. as in Tribe 2, but smaller. Fr. 

 2-5 carpels. Lvs. compound. Trees, shrubs, usually trop. Several 

 gen. 1. Xanthoxylum. Large or small (often prickly) trees, shrubs ; 

 often evergreen; erect or climbing; lvs. l-3-oo -foliolate. Fr. with 

 taste of black pepper. Many spec, both worlds. X. piperitum, 

 Japan Pepper T. Japan. X. americdnum, Prickly Ash. Decid., 

 10°-15° high; Ifts. 9-11. Common, U. S. Tribe 4. Fls. §, reg. 

 Australian shrubs, evergreen. Several gen. 1. Boronia, lvs. pinnate ; 



