Part 3, 1911] RUTACEAE 203 



8. MEGASTIGMA Hook. f. in Benth. & Hook. 

 Gen. PI. 1 : 299. 1862. 

 Unarmed shrubs with woocty branchlets. Leaves alternate, odd-pinnate ; leaflets oppo- 

 site, glandular-punctate. Flowers perfect. Calyx small, 4-parted. Petals 4, membra- 

 nous, imbricate. Disk thick, erect. Stamens 8, inserted at the base of the disk, the 4 

 alternate ones shorter ; filaments filiform. Ovary didymous, 2-celled. Style short, thick. 

 Stigma large, capitate, obscurely 2-lobed. Ovules 2 in each cell, collateral. Fruit mostly 

 didymous. 



Type species, Megastigma Skinneri Hook. f. 



Leaflets 5 or 7, obliquely ovate to orbicular ; inflorescence few-flowered, racemose. 1. M. Galeoltii. 

 Leaflets many-paired (mostly 13-17), narrowly lanceolate to ovate ; inflorescence 

 paniculate. 2. M. Skinneri. 



1. Megastigma Galeottii Baillon, Adansonia 10 : 331. 1872. 



Fagara pumila Engler, Bot. Jahrb. 21 : Beibl. 54: 21. 1896. 



A small straggling shrub with often approximate, stout, crooked, grayish branches 

 and flexuous twigs, the younger parts densely canescent-pilose ; leaves at the ends of the 

 branchlets, 1-2 cm. long, the petioles, rachis, and lower surfaces of the leaflets cinereous- 

 pilose ; rachis wingless or sometimes very narrowly winged ; leaflets 5 or 7, subcoriaceous, 

 the lateral ones sessile or subsessile, obliquely ovate to orbicular, 3-7 mm. long, 2.5-6 mm. 

 broad, commonly rounded and occasionally emarginate at the apex, cuneate to obliquely 

 rounded at the base, the terminal leaflet usually slightly larger, obovate-cuneate to subor- 

 bicular or subcordate ; flowers white, in short, terminal, few-flowered racemes ; sepals tri- 

 angular or triangular-ovate, ciliate ; petals 2-2.5 mm. long, 1-2 mm. broad ; fruit solitary 

 or paired, long-pedicelled, pyriform or subglobose, 2.5-3 mm. in diameter. 



Type locality : Cactus-abounding plains on the Cordillera of Oaxaca. 

 Distribution : Puebla and Oaxaca. 



2. Megastigma Skinneri Hook. f. in Benth. & Hook. Gen. 

 PI. 1 : 299. 1862. 

 A fragrant unarmed shrub; leaves 3-6.5 cm. long, canescent-pilose, at least when 

 young ; leaflets many-paired (mostly 13-17), narrowly lanceolate to ovate, 0.8-1.5 cm. long, 

 2-7 mm. broad, entire, short-petioluled, acute at the apex, acutish or somewhat rounded 

 at the base ; panicles terminal, shorter than the leaves ; flowers small ; petals oblong, 

 membranous, glandular-punctate ; pedicels slender ; ovary glabrous, the lobes oblong. 

 Type locality : Guatemala. 

 Distribution : Guatemala. 



9. POLYASTER Hook. f. in Benth. & Hook. 

 Gen. PI. 1 : 299. 1862. 



Unarmed shrubs with alternate odd-pinnate leaves. Flowers perfect. Calyx small, 

 the sepals distinct to the base or nearly so. Petals 5, spreading, valvate. Stamens 10, 

 nearly equal, inserted at the base of the disk, shorter than the petals ; filaments subulate ; 

 anthers 2-lobed. Disk thick, obscurely 10-lobed. Ovary deeply 5-parted, the lobes hairy, 

 sessile on the broad pillow-like disk ; style very short, thick, connate ; stigma depressed, 

 capitate, 5-lobed. Ovules 2 in each cell, nearly collateral. Carpels 5. Fruit of 5 carpels, 

 or by abortion, of 2 or 3. 



Type species, Polyaster boronioides Hook, f . 



1. Polyaster boronioides Hook. f. in Benth. & Hook. 



Gen. PI. 1 : 299. 1862. 



? Zanthoxylum inerme Hoc. & Sesse, Fl. Mex. ed. 2. 230. 1894. 



Fagara Ehrenbergii Kngler, in E. & P. Nat. Pfl. 3< : 118, nomen nudum. 1896. 



Polyaster Ehrenbergii Engler, Bot. Jahrb. 21 : Beibl. 54: 26. 1896. 



A shrub about 2 m. high, with slender leafy twigs, the branchlets and young leaflets 

 very minutely cinereous-puberulous ; leaves 5-7 cm. long, the petiole and rachis narrowly 



