ORDER 34. SIMARUBACE^E. 71 



/3. frutico*um Shrub ; Ive. ovate-oblong, scarcely pointed ; ovaries 2. S. 

 3 Z. Florldanum N. Satin-wood. Unarmed ; Ifts. 57, 9 ovate-lanceolate, $ e\ 

 liptical, obtuse ; fls. minute ; carp. 1 2, 1-seeded, obovoid. S. Fla. 



4. PTELEA, L. SHRUB TREFOIL. (nrsXea, the elm-tree ; from th% 

 resemblance of the fruits.) $ $ $ . Sepals 3 to 6, mostly 4, much shortei 

 than the spreading petals. $ Stamens longer than the petals and alternate 

 with them, very short and imperfect in ? . Ovary of 2 united carpels. Stig 

 2. Fruit 2-celled, 2-seeded samarse, with a broad, orbicular margin. $ Lv& 

 3-5-foliate. Fls. cymous. 



1 P. trifoliata L. Lvs. 3-foliate, Ifts. sessile, ovate, short-acuminate, lateral ones in 



equilateral, terminal ones cuneate at base ; cymes corymbous ; stam. mostly 4 ; styl% 

 short. Rocky places, N. Y. S. and W. 6 Sf. Fls. white, odorous. June. 

 /3. molUn. Young branches, petioles and leaves beneath, soft-downy and hoary. S 



2 P. Baldwinii T. & G. Lvs. glabrous, very small ; Ifts. sessile, oval, obtuse ; Ptam. 



4 : stig. sessile. E. Fla. If. Branches numerous and scraggy. Lvs. 1'.- 



ORDER XXXII. AURANTIACE^E. O*ANGEWORTS. 



Trees or sJirubs, glabrous, abounding in little transparent receptacles of 

 volatile oil, with leaves alternate, 1-3-foliate or pinnate. Flowers regular, 3- 

 5-merousJ. Stamens with flat filaments, distinct or cohering in one or sev- 

 eral sets. Ovary compounded of several united carpels. Style 1. Fruit 

 (hesperidium) many-celled, pulpy, covered with a thick rind. Albumen 

 Cotyledon thick. Figs. 37, 363. 



CITRUS, L. (Kirpiov, the citron; the fruit of one of the species.) 

 Sepals and petals in 5's. Anthers 20, or some other and higher multiple of 

 5, versatile, the connectile articulated to the filament. Filaments dilated at 

 base, polyadelphous. Berry 9-18-celled. J> 5 A noble E. Indian genus 

 Lvs. 1-foliate, entire, evergreen. Petiole often winged. 



1 C. vulgarls Risso. Bitter Orange. Petiole winged ; Ivs. elliptical, acute, crenu- 



late ; stam. 20 ; fruit globular, with a thin rind and bitter pulp. S. Fla. 15 20f. Asia. 



2 C. AURANTIUM. Sweet Orange. Petiole scarcely winged ; 1ft. oblong, acute, crenu- 



late ; sta. 20 ; fr. globous, with a thin rind and sweet pulp. 30f. 



3 C. LIMETTA. Lime. Petioles not at all winged; 1ft. ovate-orbicular, serrate; stam. 



30 ; fr. globous, with a sweet pulp, and a protuberance at top. 15f. 



4 C. LIMONUM. Lemon. Petioles somewhat winged ; sta. 35 ; fr. oblong-spheroid, 



with a thin rind and very acid pulp. 20f. Fr. yellow. 



5 C. DECUMANA. Shaddock. Petioles broadly winged; 1ft. obtuse, emarginate : fr 



very large, with a thick rind. 15f. Fruit green-yellow. 5 r diam. 



ORDER XXXIV. SIMARUBACE^E. QUASSIAWORTS. 



Trees or shrubs with bitter bark, alternate, exstipulate, pinnate leaves, 

 and small, diclinous, regular, hypogynous 3-5-merous flowers. Stamen* 

 as many or twice as many as the petals, inserted on the hypogynous disk. 

 Styles 2 5. Ovaries 2-5-lobed or carpellecL Fruit 1 5 one-seeded 

 drupes or samaras 



