Part 3, 1911] RUTACEAE 205 



11. CHOISYA H.B.K. Nov. Gen. & Sp. 6 : 4. 1823. 



Plenckia Moc. & Sesse ; DC. Prodr. 1 : 724, as synonym. 1824. Not Pknckia Raf . 1814. 



Juliania Llave & I.ex. Nov. Veg:. Descr. 2: 4. 1825. 



A strop hy Hum Torr.; T. & G. Pacif. R. R. Rep. 2-' : 161. 1854. 



Shrubs with opposite or subopposite, digitate leaves. Flowers perfect, in axillary, 

 peduncled, corymb-like cymes near the tips of the branches. Sepals 4 or 5, deciduous, 

 membranous. Petals 4 or 5, spreading. Stamens 8 or 10, inserted on the disk, those 

 opposite the petals shorter ; filaments broadly subulate or narrowly lanceolate ; anthers 

 round-cordate or oval. Ovary sessile, 4-5-lobed, 4-5-celled ; stigma capitate, 4-5-lobed. 

 Ovules 2 in each cell, superposed or collateral. Fruit of 5, or by abortion 3, coriaceous, 

 2-valved carpels. 



Type species, Choisya temata H.B.K. 



Leaves 3-foliolate ; leaflets oblong; to obovata, 0.5-3 cm. broad. 1. C. lernaia. 



Leaves 5-10-foliolate (rarely 3-foliolate) ; leaflets linear, 1-3 mm. broad. 2. C. dumosa. 



1. Choisya ternata H.B.K. Nov. Gen. 6 : 6. 1823. 



Juliania caryophillata Llave & Lex. Nov. Veg. Descr. 2 : 4. 1825. 



Choisya grandiflora Regel, Gartenflora 25 : 257. 1876.— Acta Hort. Petrop. 4: 336. 1876. 



An aromatic shrub, a few meters in height, with showy white flowers ; branches of the 

 inflorescence, twigs, and petioles rather loosely short-pubescent, the young parts more 

 densely so ; leaves petioled, digitately 3-foliolate ; leaflets oblong to obovate, the terminal 

 one sessile or short-petioluled, 2-8 cm. long, the lateral sessile, 1.5-5.3 cm. long, 0.5-3 cm. 

 broad, all rounded or emarginate at the apex, cuneate at the base, somewhat inequilateral, 

 obsolete]}- reticulate-veined, entire, ciliate at least when young, the petioles semiterete, 

 1-2.5 cm. long, channeled above ; flowers usually long-pedicelled, 1.8-2.4 cm. broad ; sepals 

 ovate to ovate-oblong, ciliate, about 4 mm. long, 3-5-nerved, bearing a rather prominent 

 brownish gland just below the apex ; petals oblong to obovate, occasionally somewhat lanceo- 

 late, 1-1.4 cm. long, glabrous, nearly equal ; ovary hairy. 



Type locality : Mexico. 

 Distribution : Mexico. 



Illustrations : H.B.K. loc. cit. pi. 513 ; E. & P. Nat. Pfl. 3* : /. 69, S-T ; C. K. Schneider, 

 Handb. Laubh. 2 : /. 7S, a-e ; Garden 12 : opp. 232 ; Gartenflora pi. S76. 



2. Choisya dumosa (Torr.) A. Gray, Proc. Am. 

 Acad. 23 : 224. 1888. 

 Aslrophyllum dumosum Torr.; T. & G. Pacif. R. R. Rep. 2 2 : 161. 1S54. 



A much-branched shrub, 1-2 m. tall, with opposite or alternate branches, which are 

 more or less pubescent with short closely appressed hairs and frequently bear pustule-like 

 glands; leaves pubescent with scattered hairs, or glabrous ; petioles as long as or shorter 

 than the leaflets ; leaflets 5-10, rarely 3, linear, 1-5 cm. long, 1-3 mm. broad, coriaceous, 

 crenulate with distant gland-tipped teeth, the apex blunt or retuse ; calyx pubescent ; 

 sepals oval, ciliate, 4-5 mm. long; petals white, obovate, somewhat inequilateral, narrowed 

 at the base, 1 cm. long ; ovary hairy ; capsule hairy, glandular, about 12 mm. broad ; seeds 

 mostly solitary, lunate-pyriform, thicker at one end than at the other, 3-4 mm. long, black ; 

 cotyledons obovate or oval, thin ; embryo slightly curved. 



Type locality : Mountains of northern Chihuahua. 

 Distribution : Texas to Arizona and northern Mexico. 

 Illustrations : E- & P. Nat. Pfl. 3* : f. 69, U-Y. 



12. PELTOSTIGMA Walp. Rep. 5 : 386. 1846. 



Pachystigma Hook. Ic. Pl.pl. 69S, 699. 1844. Not Pachystigma Hochst. 1842. 



Unarmed shrubs or small trees with alternate, digitate leaves. Sepals 3 or 4, con- 

 cave, unequal, the interior ones large, petal-like, the exterior smaller, herbaceous. Petals 

 4-8, exceeding the sepals, white, in aestivation imbricate. Disk thick, fleshy. Stamens 

 numerous, unequal, inserted on the disk. Filaments erect, subulate ; anthers oblong. 

 Ovary sessile, of 6-10 unicellular carpels, which are connate on the sides, free at the axis. 



