66 RUTACE^. (UUK FAMILY.) 



Order 34. RUTACE^. (Rue Family.) 



Herbs, shrubs, or trees, with exstipulate shnple or compound dotted 

 leaves, and regular hypogynous perfect or unisexual flowers. — Sepals and 

 petals 3-5. Stamens as many or twice as many as the sepals. Ovaries 

 2-5, distinct or united, stipitate or sessile on a glandular disk. Styles 

 mostly united. Fruit commonly composed of separate 1 -celled 2-valved 

 carpels. Embryo straight or curved, mostly iu fleshy albumen. 



1. .ZAITTHOXYLUM, L. rRicicLT Ash. 



Flowers monoecious or dioecious. Sepals and petals 3-5. Stamens 3 - 5. 

 Ovaries 2 - 5, sessile or stipitate, 2-ovulcd. Carpels 2-valvcd, 1 - 2-seeded. Seed 

 smooth and sliining. — Trees or shrubs, commonly armed with stipular prickles. 

 Leaves unetfually pinnate, the leaflets punctate with pellucid dots. Flowers 

 small, greenish. 



1. Z. Carolinianum, Lam. (Toothache-Tree.) Smooth; branches 

 and commonly the petioles armed with long prickles ; leaves alternate, 7-9- 

 foliolate; leaflets ovate-lanceolate, crenate-serrulate, uncqual-sidcd, shining above ; 

 panicles terminal; stamens 5; caqieis 3, nearly sessile. — Yar. fruticosum. 

 Gray. Shrubby ; leaves shorter, ovate or oblong, more strongly crenate ; ova- 

 ries always two. — Dry soil near the coast, Florida to North Carolina, and west- 

 ward. June. — A small tree, with the pungent bark armed with warty jirickles. 



2. Z. Floridanum, Nutt. (Satin-Wood.) Branches and petioles un- 

 armed; leaflets 5-7, ovate-lanceolate on the fertile plant, and elliptical, obtuse 

 or emarginate on the sterile, slightly crenulate, and like the cymose panicle stel- 

 late-pubescent ; stamens 4 - 5 ; carpels 1-2, obovate, stipitate ; seed solitary, 

 obovate, black and shining. — South Florida. — Leaves l'-2' long. Cyme 

 sessile, divided into three primary branches. Flowers minute. 



3. Z. Pterota, H. B & K. Smooth ; branches zigzag, armed with short 

 curved prickles; petiole winged, jointed; leaflets 7-9, small, obovate, coria- 

 ceous, crenate above the middle, sessile ; flowers in axillarj- clusters, which are 

 single or by pairs, as long as the first joint of the petiole ; stamens 4 ; ovaries 

 2 ; carpels solitary, globose, pitted, distinctly stipitate. — South Florida. — Leaf- 

 lets h' - i' long, those on the fertile plant narrower and smaller. Carpels small, 

 dotted. 



2. PTELEA, L. Hoptree. 



Flowers polygamous. Sepals and petals 4-5, imbricated in the bud, decidu- 

 ous. Stamens 4-5. Ovary 2-celled, with two ovules in each cell. Style short. 

 Stigma 2-lobcd. Capsule 2-celled, 2-seeded, surrounded by a broad circular 

 reticulated wing. — Unarmed shrubs, with trifoliolate leaves, and small greenish 

 flowers in a terminal cyme. 



1. P. trifoliata, L. Pubescent; leaves long-petioled ; leaflets oval or 

 oblong, mostly acute, obscurely crenulate, paler beneath, the lateral ones unequal- 



