656 TREES OF NORTH AMERICA 



than the others, equal or almost so and shorter than the petals in the pistillate flower; 

 filaments filiform; anthers oblong, attached near the base; ovary ovoid, 3-celled, 

 pilose, raised on a long stipe, rudimentary in the stanriuate flower; style subulate, fili- 

 form, elongated, slightly curved upward; stigma minute, terminal; ovules 2, borne on 

 the inner angle of the cell near its middle, ascending, the micropyle inferior. Fruit 

 a coriaceous 3-celled loculicidally 3-valved broadly ovate capsule, conspicuously stipi- 

 tate, crowned with the remnants of the style, rugosely roughened and dark reddish 

 brown, loculicidally 3-valved, the valves somewhat cordate, bearing the dissepiment on 

 the middle. Seed generally solitary by abortion, almost globose ; seed-coat coriaceous, 

 very smooth and shining,. dark chestnut-brown or almost black; hiluin broad; tegmen 

 thin; embryo filling the cavity of the seed; cotyledons thick and fleshy, nearly hemi- 

 spherical, conferruminate, incumbent on the short conical descending radicle turned 

 toward the hilum, remaining below ground in germination. 



Ungnadia with a single species is confined to Texas, New Mexico, and northern 

 Mexico. 



The name is in honor of Baron Ferdinand von Ungnad, Ambassador of the Em- 

 peror Rudolph II. at the Ottoman Porte who sent seeds of the Horsechestnut-tree 

 from Constantinople to Vienna in the middle of the sixteenth century. 



1. Ungnadia speciosa, Endl. Spanish Buckeye. 



Leaves appearing from March to April with or just after the flowers, 6'-12' long, 

 with stout petioles 2'-6' long, rather coriaceous leaflets, dark green and lustrous on 



the upper and pale and rugose on the lower surface, 3 r -5' long and l^'-2' wide, the 

 terminal leaflet on a petiolule \'-V long. Flowers 1' across when expanded, in 

 crowded clusters l^'-2' long. Fruit 2' broad, opening in October, the empty pods 

 often remaining on the branches until the appearance of the flowers the following 

 year; seeds '-' in diameter. 



A tree, occasionally 25-30 high, with a trunk C'-8' in diameter, dividing at some 

 distance from the ground into a number of small upright branches, and branchlets 

 light orange-brown and covered during their first season with short fine pubescence, 

 pale brown tinged with red, glabrous and marked by scattered lenticels in their 

 second year; more often a shrub, with numerous stems. Winter-buds about |' in 

 diameter. Bark of the trunk rarely more than \' thick, light gray and broken by 



