332 



MIMOSACRAE. 



Vol. II. 



I. Acuan leptolbba (T. & G. j Kuntze. 

 Prairie Mimosa. Fig. 2431. 



Desinanthus Icplolobus T. & G. Fl. N. A. i ; 40J. 1S40. 

 Acuan Icptoloba Kuntze, Rev. Gen. PI. 158. 1891. 



Herbaceous, ascending, branched, stems rough- 

 angled, 2-3 long. Leaves short-petioled, bipinnate; 

 pinnae 5-10 pairs, sessile; leaflets 10-24 pairs, sessile, 

 linear-lanceolate, acute, inequilateral, rounded at the 

 base, usually glabrous, ih"-2" long, *" wide or less; 

 peduncles 6"-T2" long, few-flowered ; stamens 

 (always?) S; pods 3-8, narrowly linear, acuminate, 

 nearly straight, glabrous, about 3 limes the length 

 of the peduncle, 6-8-seeded. 



Prairies, Kansas to Te.xas. Summer. 



2. Acuan illinoensis (Michx.) Ktintze. 

 Illinois IMimosa. Fig. 2432. 



Mimosa illinoensis Miclix. Fl. Bor. Am. 2 : 254. 



1803. 

 Acacia brachyloha \\ illd. Sp. PI. 4: 1071. 1806. 

 Desinanthus braclixlobus Benth. in Hook. Journ. 



Bot. 4: 358. 1S42. 

 A. illinoensis Kuntze, Rev. Gen. PI. 158. 1891. 



Ascending or erect, glabrous or nearly so, 

 stems angled, i-3 high. Foliage resembling 

 that of the preceding species, but the pinnae 

 and obtusish leaflets are sometimes more 

 numerous; peduncles i'-2' long; pods nu- 

 merous, densely capitate, oblong or lanceo- 

 late, strongly curved, 8"-i2" long, acute, slightly 

 impressed between the 2-5 seeds. 



Prairies and river-banks. Ohio to Kentucky. 

 Florida, South Dakota, Colorado. Texas and New 

 Mexico. Illinois acacia. May-Sept. 



4. PROSOPIS I.. Mant. i 



10. 



1767. 



Trees or shrubs often with spines in the axils, with 2-pinnate leaves, the leaflets few or 

 numerous, and small spicate or capitate perfect flowers. Caly.K cainpanulate, with 5 short 

 teeth. Petals 5, valvate, distinct, or connate below. Stamens 10. distinct ; filaments long. 

 Ovary often stalked, many-ovuled ; styles slender or filiform ; stigma very small. Pod linear, 

 straight or curved, compressed, leathery, indehiscent, the mesocarp spongy or dry. Seeds 

 flattened, [.\ncient name for some very different plant.] 



About IS species, natives of warm and tropical regions. Besides the following. 2 or 3 others 

 occur in the southwestern United States. Type species : Frosopis spicigera L. 



