Part 3, 1911] RUTACEAE 221 



1. Chalcas exotica (L.) Millsp. Field Columb. Mus. Publ. 



Bot. 1 : 25. 1895. 



Murraea exotica L. Mant. 563. 1771. 



Camuniitm exoHcum Kuntze, Rev. Gen. 99. 1891. 



A shrub or small tree, with pale bark and usually puberulent twigs and petioles ; leaflets 

 3-9, ovate to rhombic-ovate, oval, or sometimes obovate, 1.5-5 cm. long, 0.7-2.3 cm. broad, 

 occasionally longer and broader, obtuse or obtusely acuminate and frequently emarginate at 

 the apex, cuueate at the base, short-petioluled ; flowers campanulate, fragrant, 1.3-2 cm. 

 broad ; sepals triangular, obtuse, glabrous or puberulent ; petals white, oblanceolate or some- 

 times obovate or spatulate, 1.2-2.3 cm. long, 3.5-7 mm. broad; gynophore well-developed ; 

 ovary glabrous; berry ovoid or subglobose, 1-1.6 cm. long, pointed, red. 



Type locality : India. 



Distribution : West Indies and tropical continental America. Naturalized from Asia. 

 Illustrations: Bot. Reg. 5: pi. 434 ; E. & P. Nat..Pfl. 3» : /. 108, A-G ; Lam. Tab. Encyc. 

 pi. 352. 



26. TRIPHASIA Lour. Fl. Coeh. 1 : 152. 1790. 



Spin)' evergreen shrubs. Leaves alternate, trifoliolate, or occasionally 1- or 2-folio- 

 late. Flowers solitary, or several in axillary cymes. Calyx cup-shaped, 3-lobed or 4-lobed. 

 Petals 3 or 4, imbricate. Stamens 6, inserted on a fleshy disk, the filaments compressed, 

 dilated toward the base, the anthers oblong. Ovary obovate, 3- or4-celled, narrowed into a 

 deciduous style ; stigma obtuse or capitate, 3- or 4-lobed. Ovules solitary in each cell. Fruit 

 1-3-seeded. Seeds oval, oblong-oval, or subglobose; testa fleshy; cotyledons plano-con- 

 vex, rather thick, unequal, and occasionally lobed ; embryo straight. 



Type species, Triphasia Aurantiola Lour. 



1. Triphasia trifolia (Burm. f.) P. Wilson, Torreya 9 : 33. 1909. 



Limonia trifolia Burm. f. Fl. Ind. 103. 1768. 

 Limonia trifoliate. L. Mant. 237. 1771. 

 Triphasia Aurantiola Lour. Fl. Coch. 1 : 153. 1790. 

 Triphasia trifoliata DC. Prodr. 1 : 536. 1824. 



A shrub, 1.5-2 m. or more in height, the branches puberulent when young; spines 

 axillary, paired, 5-17 mm. long, straight ; leaflets crenate, ovate to oval, the lateral ones 

 1-3.5 cm. long, 1-2.7 cm. broad, obtuse or rounded and emarginate at apex, cuneate 

 or somewhat rounded at the base, frequently inequilateral, the terminal one larger and 

 more gradually contracted at the base ; petioles short, puberulent; flowers fragrant, short- 

 peduncled ; calyx puberulent, the lobes broadly triangular, ciliate ; petals oblong, white, 

 12-16 mm. long, 5-6 mm. broad ; berry oval or globose, red, 10-16 mm. long, insipid, 

 aromatic, punctate. 



Type locality : Java. 



Distribution : Cultivated ; naturalized in tropical and subtropical America as far north as 

 Florida and Texas. 



Illustrations : Burm. f. Fl. Ind. pi. 35, f. 1, faulty ; Jacq. Ic. PI. Rar. pi. 463 ; Lam. Tab. 

 Encyc. pi. 353, f. 2 ; Andr. Bot. Repos. 2 : pi 143; Bot. Cab. 1 : pi. IS ; Blanco, Fl. Fil. ed. 3. pi. 

 129; E. &. P. Nat. Pfl. 3' : /. 110. 



27. CITRUS L. Sp. PI. 782. 1753. 



Limon Mill. Card. Diet. Abr. ed. 4. 1754. 

 Poncirus Raf . Sylva Tell. 143. 1838. 



Glandular, aromatic shrubs or small trees, mostly with thorny branches. Leaves alter- 

 nate, persistent, unifoliolate (trifoliolate and deciduous in C. trifoliata L.), pellucid-glan- 

 dular. Petioles winged or wingless. Flowers perfect, axillary, solitary, clustered or in 

 small cymes, white or purplish-pink, sweet-scented. Calyx cup-shaped, 3-5-toothed. 

 Petals 4-8, thick, glandular, imbricate in the bud. Stamens 20-60, united or separate, the 

 filaments inserted around an annular or cup-like disk. Ovary several-celled, the styles 

 united, deciduous. Ovules several in each cavity. Fruit an oblong, globose or pear-shaped 

 berry with a bitter, leathery rind, containing numerous oil glands and a juicy aromatic 

 pulp. Seeds several in each cavity. Testa white, leathery. Cotyledons fleshy. 



Type species, Citrus Medico. L. 



