660 TREES OF NORTH AMERICA 



to the shores of Bay Biscayne; common and generally distributed; also on the Ba- 

 hama Islands. 



3. KRUGIODENDRON, Urb. 



A small tree or shrub, with slender unarmed terete branches roughened by numer- 

 ous small lenticels, and minute scaly buds. Leaves opposite or obliquely opposite, or 

 sometimes alternate on lower branches, ovate or oval, often emarginate, coriaceous, 

 entire, short-petiolate, feather-veined, persistent. Flowers greenish yellow, on short 

 slender pedicels, in axillary simple or di6hotomously branched cymes; calyx broadly 

 obconical, 5-lobed, the lobes triangular, acute, erect or spreading, crested on the 

 inner surface, deciduous; disk annular, broad, fleshy, 5-lobed, surrounding the base 

 of the ovary; petals 0; stamens 5, inserted under the margin of the disk; anthers 

 ovate or ovate-orbicular, obtuse; ovary conical, imperfectly 2-celled ; styles short and 

 thick, united nearly to the apex, the branches spreading and stigmatic on the inner 

 face; ovule ascending from the base of the cell. Fruit 1-seeded, ovate or ovoid; 

 flesh thin ; walls of the stone thin and bony. Seed ellipsoidal, compressed, without 

 albumen; seed-coat membranaceous ; embryo filling the cavity of the seed; cotyle- 

 dons thick and fleshy, obovate or elliptical. 



Krugiodendron with a single species is confined to southern Florida and the West 

 Indies. 



The generic name is in honor of Leopold Krug (1833-1898), a student of the 

 flora of the Antilles. 



1. Krugiodendron ferreum, Urb. Black Ironwood. 



(Rhamnidium ferreum, Silva N. Am. ii. 29.) 



Leaves bright green and lustrous on the upper, pale yellow-green on the lower 

 surface, glabrous with the exception of a few scattered hairs on the upper surface 

 and on the petioles, I'-l^' long, f '-!' wide, with entire or slightly undulate margins, 



persistent for two or three years; their petioles stout, \' long; stipules acuminate, 

 persistent. Flowers on bibracteolate pedicels -|-' long, in 3-5-flowered cymes on 

 peduncles sometimes ' long, usually much shorter and often branched near the apex, 

 on branchlets of the year; calyx about T y long, the acuminate lobes conspicuously 



