201 NORTH AMERICAN FLORA [VOLUME 25 



winged; leaflets 11-25, subcoriaeeous, linear-olong, 6-12 mm. long, 3-4 mm. broad, rounded 

 at the apex, acute at the base, the margin minutely crenulate ; panicles axillary, loose, 4-6 

 cm. long, a little shorter than the leaves; fruiting pedicels 1-1.5 cm. long; lower bracts 

 spatulate, the upper lanceolate ; sepals lanceolate ; carpels 5, or by abortion 2 or 3, com- 

 pressed on the sides, rounded on the back ; endocarp thin, chartaceous ; seeds 2, thick, 

 reniform, 2.5 mm. long, 2 mm. thick. 



Type locality : Zimapan, Hidalgo. 

 Distribution : Hidalgo and Taruaulipas. 



10. DECATROPIS Hook. f. in Benth. & Hook. 

 Gen. PI. 1 : 298. 1862. 



Small unarmed trees or shrubs with alternate odd-pinnate leaves. Flowers perfect, in 

 large terminal panicles. Calyx short, cup-shaped, 5-dentate. Petals 5, inserted at the base 

 of the disk. Stamens 10, inserted on the base of the column-like disk, those opposite the 

 petals shorter ; filaments filiform. Ovary deeply 5-parted, 5-celled, sessile on a column- 

 like disk ; carpels grooved on the back, the edges wing-like ; stigma 5-lobed. Fruit of 5, 

 or by abortion of 2 or 3, distinct, reniform or lunate carpels, narrowly winged on each 

 edge of the back. Seed solitary ; cotyledons elliptic ; embryo curved. 



Type species, Decatropis Coulteri Hook., f. 



Ovary tomentulose. 1. D. paitcijuga. 



Ovary glabrous. 2. D. bicoior. 



1. Decatropis paucijuga (Donn. Smith) Loes. Bull. Herb. 

 Boiss. II. 3: 208. 1903. 

 Polyaster paucijugus Donn. Smith, Bot. Gaz. 27 : 331. 1899. 



Branches of the inflorescence, petioles, rachis, and under surfaces of the leaflets clothed 

 with a yellowish tomentum ; leaves 2-3.5 dm. long; leaflets 5-9, entire, alternate or op- 

 posite, becoming blackish above in drying ; lateral leaflets oblong-lanceolate to lanceolate, 

 7-10 cm. long, 2.5-4 cm. broad, acuminate at the apex, more or less inequilateral and acutish 

 or rounded at the base, glabrescent above, the venation inconspicuous, reticulate-veined 

 beneath ; flowers in large, terminal obpyramidal panicles ; calyx 2-2.5 rnm. broad, more or 

 less tomentulose, the teeth triangular ; petals lanceolate to linear-lanceolate, mostly about 

 5 mm. long, 1.5-2 mm. broad, the margin involute, the apex acute, inflexed ; filaments 

 glabrous ; anthers orbicular ; disk about 1 mm. high ; carpels tomentulose. 



Type locality : Dept. Huehuetenango, Guatemala. 

 Distribution : Guatemala. 



2. Decatropis bicoior (Zucc.) Radlk. Sitz.-ber. Akad. Munch. Math.- 

 Phys. CI. 16 : 306. 1886. 



Siviaba bicoior Zucc. Flora 15 2 : Beibl. 72. 1832. 



Decatropis Coulteri Hook. f. in Benth. & Hook. Gen. PI. 1 : 299. 1862. 



A slender shrub, 2-7. m. tall, with terete branches clothed with a pale or cinnamon- 

 colored, ferruginous tomentum, as are also the lower surfaces of the leaflets, the petioles, 

 and rachis ; leaves 1-2.4 dm. long; leaflets 5-11, commonly 7, opposite or occasionally al- 

 ternate; lateral leaflets lanceolate to narrowly lanceolate, 2.5-7.5 cm. long, 1-3 cm. broad, 

 obtuse to acuminate at the apex, rounded, somewhat acute or inequilateral at the base, 

 glabrescent above, with veins more or less prominent and finely reticulate, coarsely and 

 closely reticulate beneath, the margin revolute ; flowers about 7 mm. broad, short-pedicelled, 

 the pedicels about 1 mm. long; calyx ferruginous-tomentose, the lobes triangular, 1 mm. 

 long; petals white or creamy-white, lanceolate, 4-5 mm. long, 2-2.5 mm. broad; mature 

 carpels 3^.5 mm. long, 2-3.2 mm. broad, narrowly winged on each edge of the back ; 

 seeds crescent-shaped, 2-2.8 mm. long, 1.5-2 mm. broad. 



Type locality : Mexico. 



Distribution : Mexico. 



Illustrations: Hemsl. Biol. Centr. Am. Bot. 5: pi. 13; E. & P. Nat. Pfl. 3* : /. 6S. 



