SlMARUBACEAE. 113 



clusters or panicled; and small leathery capsules, each with I 

 or 2 round black seeds. 



1. Prickles by leaf-bases large, deltoid-acuminate. Z. Bungei. 

 Prickles not greatly dilated at base. 2. 



2. Flowers panicled : leaflets glossy, falcate. Z. Clava-herculis. 

 Flowers clustered in the axils. Z. americanum. 



Family SlMARUBACEAE. Quassia Family. 

 A rather small family of little economic importance; chief- 

 ly known in temperate regions through the too-common use of 

 the tropical-appearing ailanthus. 



AILANTHUS. Tree of Heaven. 



Loosely branched deciduous trees with rather smooth 

 coarsely lenticeled bark; yellowish soft wood with rather large 

 spring ducts, tangentially disposed summer ducts, and distinct 

 medullary rays ; stout twigs with homogeneous colored pith ; 

 half-round buds with 2 or 4 exposed scales, the place of the 

 terminal represented by a large scar ; alternate odd-pinnate 

 large leaves with somewhat toothed leaflets bearing nectar- 

 glands beneath on some of the teeth ; small dioecious polypetal- 

 ous panicled flowers ; and elongated somewhat twisted samaras. 



1. Twigs prickly. A. Vilmoriniana. 

 Unarmed. 2. 



2. Twigs finely pubescent. 3. 



Twigs glabrous. A. glandulosa pendulifolia. 



3. Fruit green. A. glandulosa. 

 Fruit red. A. glandulosa erythrocarpa. 



Family MELIACEAE. Chinaberry Family. 

 A small chiefly tropical family producing mahogany, the val- 

 uable West Indian "cedar" or cigar-box wood ; a few forms 

 used for shade trees. 



CEDRELA. False Cedar. 



Deciduous rather smooth-barked trees resembling Ailanthus, 

 with brown mahogany-like wood with large ducts crowded in 

 spring but small and fewer in summer, and fine medullary rays ; 

 stout twigs; large round colored homogeneous pith; alternate 



