TREES AND SHRUBS. 



PROSOPIS JULIFLORA, var. CONSTRICTA, Sarg. 



Prosopis julifloba, var. constricta, n. var. 



Prosopis glandulosa, Cox, Bull. No. 1, La. State 3Ius., 2, f (not Torrey) (1910). 



Leaves two- or rarely four-pinnate, the pinnae mostly from twenty- to twenty-four-foliolate ; 

 leaflets oblong to oblong-ovate, often falcate, dark green, acute or rounded and apiculate at the 

 apex, from 2 to 4 centimetres long and from 5 to rarely 10 millimetres wide. Flowers on slender 

 pedicels from 2 to 3 millimetres in length, in spikes from 8 to 10 centimetres long ; calyx gla- 

 brous, five-lobed, the lobes acuminate ; petals five, acuminate at the ends, free at the base, pale 

 yellow, glabrous on the outer surface, coated above the middle on the inner surface with long 

 white hairs, about 4 millimetres long ; stamens ten, free, inserted with the petals on the margin 

 of a minute disk adnate to the calyx-tube, those opposite the lobes of the calyx rather longer than 

 the others ; filaments filiform, exserted ; anthers oblong, versatile, their connectives tipped with 

 a minute deciduous gland ; ovary stipitate, densely coated with long matted white hairs, gradually 

 narrowed into a filiform style, ending in a minute terminal stigma ; legumes from 5 to 14 centi- 

 metres long, on stout pedicels from 1.5 to 8 millimetres in length, nearly straight, slightly com- 

 pressed to subterete, terminating in long points usually much constricted between the from three 

 to twelve seeds, pale yellow more or less streaked with brown ; seeds compressed, oblong, unsymme- 

 trical, gradually narrowed and acute at the apex, rounded at the base, light yellow-brown, about 

 10 metres long and from 7 to 8 millimetres wide, enclosed in the thick sweet pulpy inner coat of 

 the pod. 



A shrub, 3 or 4 metres high, with numerous stout spreading stems and red-brown branches 

 armed with slender straight pale gray spines from 1 to 3 centimetres long. 



Louisiana : hillsides near Shreveport, Caddo Parish, R. S. Cocks, August, 1907, R. S. Cocks 

 and C. S. Sargent, March 27, 1908, T. D. Coty, Jr., July 30, 1908. 



From the other species and varieties of Prosopis this variety differs in the conspicuous constriction between the seeds 

 of most of the pods, although occasionally pods occur in which this constriction is only slightly developed. From 

 Prosopis juliflora, var. glandulosa, Sargent, a form of eastern Texas, it differs also in its more crowded and wider 

 leaflets. 



Prosopis is usually an inhabitant of dry and semi-arid regions, and it is remarkable to find a representative of the 

 genus in the fertile Red River valley of western Louisiana, although Prosopis occurs occasionally in the moist valley 

 of the lower Brazos River near the coast of Texas. C. S. S. 



