MIMOSACF.AK. 



Vol. ][. 



2. Morongia microphylla (Dryaiid) Britton. 

 Xarrow-kavcd Scn^itivc-brier. Fig. 2435. 



Mimosa liilsia Walt. Fl. Car. 2S2. 17S8. Not I.. 1753. 



Mimosa micio/'liylla Dryand. ; J. E. Smith, Georgia Insects, 

 2; 1J3. pi. 6 J. I7y7. 



Schrankia angusiata T. & G. Fl. N. A. i : 400, 1840. 



Morongia angustala Britton, Mem. Torr. Club 5: 191. 1894. 



Similar to the preceding species Pinnae 3-6 pairs; 

 leaflets numerous, linear-oblong, thin, acutish or obtuse, 

 I not mucronate or but very slightly so, very obscurely 

 veined, not at all reticulated, 1^-3" long ; peduncles 

 shorter than the leaves ; heads densely flowered, s"-8" 

 in diameter; flowers pink; pods linear, sparingly or 

 densely spiny, 2'-^' long. 



In dry soil, Virginia to Florida, west to Tennessee and 

 Texas. Sensitive plant. June-.^ug. 



Family 58. CAESALPINIACEAE Kl. & Garcke, Bot. Erg. Wald. 157. 1862. 



Senna Family. 



Trees, herbs or shrubs, witli alternate simple or compound mostly stipulate 

 leaves. Flowers mostly clustered and perfect, sometimes monoecious, dioecious 

 or polygamous, nearly regular, or irregular. Calyx mostly of 5 sepals or 5-toothed. 

 Petals usually 5, imbricated, and the upper (unpaired) one enclosed by the lateral 

 ones in the bud. .Stamens 10 or fewer in our genera, the filaments distmct, or 

 more or less united. Ovary i-celled, i-many-ovuled. Fruit a legume, mostly 

 dehiscent into 2 valves. Seeds with or with.out endosperm. 



About 90 genera and 1000 species, mostly of tropical distribution. 

 Trees or shrubs : leaves simple ; corolla irregular, apparently papilionaceous, but the lateral petals 



enclosing the upper one in the bud. i. Ccrcis. 



Herbs (all our species) ; flowers perfect ; leaves pinnate or bipinnate ; corolla nearly regular. 



Leaves pinnate, not punctate. 



Pods not elastically dehiscent ; leaves not sensitive to touch. z. 



Pods elastically dehiscent , leaves sensitive to touch. 3. 



Leaves bipinnate, glandular-punctate. 4. 



Trees : leaves pinnate or bipinnate ; flowers dioecious or polygamous. 



Receptacle short ; stamens 3-5 ; pod flat, short or elongated. 5 



Receptacle elongated ; stamens 10 ; pod oblong, woody. 



Cassia, 



Chaniaccrista. 



Hoffmanseggia. 



Gleditsia. 



6. Gymnocladus. 



I. CERCIS L. ?p. PI. 374. 1753. 



Small trees or shrubs, with simple broad leaves, and pink flowers in short lateral fascicles 

 borne on the twigs of preceding seasons. Calyx somewhat oblique, broadly campanulate, 

 S-toothed. Corolla irregular; petals S; standard enclosed by' the wings in the bud; keel 

 larger than the wings. Stamens 10, distinct, declined; anthers all alike, short, versatile, 

 longitudinally dehiscent. Ovary short-stipitate ; ovules =0. Pod linear-oblong or oblong, 

 flat, margined along the upper suture, 2-valved at maturity, the valves thin, reticulate-veined. 

 [Ancient name of the Old World Judas-tree.] 



About 7 species, natives of North America, Europe and temperate Asia. Besides the following, 

 two others occur in the south central and western United States. Type species : Cercis Siliquas- 

 trum L, 



