LEGUMINOS.E 585 



Distribution. Florida, banks o streams and borders of the Everglades, near Little 

 River to the Everglade keys, Dade County; on the Bahama Islands and in Jamaica. 



XXIH. LEGUMINOSJE. 



Trees or shrubs, with alternate usually compound leaves, regular or papilionaceous usu- 

 ally perfect flowers; stamens 10 or indefinite, with diadelphous or distinct filaments and 

 2-celled anthers, the cells opening longitudinally; ovary superior, 1 or many-celled, in- 

 serted on the bottom of the calyx. Fruit a legume. Of the four hundred and thirty genera 

 of the Pea-family now recognized and widely distributed in all temperate and tropical re- 

 gions, eighteen have arborescent representatives in the United States. 



CONSPECTUS OF THE NORTH AMERICAN ARBORESCENT GENERA. 



Subfamily 1. MIMOSOIDE^E. Calyx 4-6-toothed, the teeth valvate in the bud; petals as 

 many as the teeth of the calyx, valvate in the bud; ovules numerous, suspended in 2 

 ranks from the inner angle of the ovary, superposed, anatropous, the micropyle supe- 

 rior; stamens much exserted; leaves twice pinnate; cotyledons oval or orbicular, flat; 

 radicle straight. 



Stamens numerous (more than 10); seeds without albumen. 

 Filaments more or less united into a tube. 

 Filaments united. 



Valves of the legume not separating at maturity from the margins. 



1. Pithecolobium. 

 Valves of the legume separating at maturity from the persistent margins. 



2. Lysiloma. 



Filaments free or the inner ones slightly united at base. 3. Acacia. 



Stamens 10; filaments free; seeds with albumen. 



Legume piano-compressed, dehiscent; flow r ers in globose heads. 4. Leucsena. 



Legume terete or compressed, indehiscent; flowers in cylindric spikes. 5. Prosopis. 

 Subfamily 2. C^SALPINIOID^E. Calyx 5-lobed or toothed, the divisions usually valvate in 

 the bud; corolla imperfectly papilionaceous or nearly regular; petals 5, imbricated in 

 the bud, the upper petal inside and inclosed by the others; stamens 10 or less; filaments 

 free; anthers introrse; ovules numerous (sometimes 2 in one species of Gleditsia), super- 

 posed, anatropous, the micropyle superior; seeds albuminous. 



Flowers imperfectly papilionaceous; calyx 5-toothed; legume flat, wing-margined; leaves 

 simple. 6. Cercis. 



Flowers regular. 



Flowers polygamous or dio?cious. 



Calyx-tube elongated, 5-lobed; petals 5; stamens 10, shorter than the petals; legume 



thick and w r oody; leaves twice pinnate. 7. Gymnocladus. 



Calyx-tube short, 3-5-lobed; petals 3-5; stamens 3-5, longer than the petals; legume 



leathery; lea ves^ once and twice pinnate. 8. Gleditsia. 



Flowers perfect. 



Legume linear, torulose, acuminate at the ends, the valves contracted between the 

 seeds; rachis of the leaf spinescent. 9. Parkinsonia. 



Legume oblong, compressed; rachis of the leaf not spinescent. 10. Cercidium. 



Subfamily 3. PAPILIONAT^E. Calyx of 5 more or less united sepals; corolla of 5 irregular 

 petals, papilionaceous, the upper petal (standard) larger than the others and inclosing 

 them in the bud, usually turned backward or spreading, the 2 lateral petals (wings) 

 oblong, exterior to the 2 lower connivent more or less united petals (keel) inclosing the 

 stamens and pistil; stamens 10, 9 of them united into a tube cleft on the upper side, the 

 10th and upper stamen separate, or all distinct; ovary 1 or many-celled by cross parti- 

 tions; ovules amphitropous, the micropyle superior; seeds usually without albumen; 

 leaves once pinnate. 



