40. ROSACEM. [2. Rosa. 



2. Rosa, L. Rose. 

 1. R. involucrata, Roxb. 



A pretty plant with arching branches, pinnate leaves of 

 3-4 prs. of finely serrate leaflets, and white flowers 2'' diam., 

 solitary or in short corymbs. 



Along the banks of the larger rivers. Fl. Feby -May. Fr. r. s. 

 BrancMets and inflorescence tomeni ->e. L. 3-4''. Lflts. j-\\". Bracts 

 large lanceolate pectinately gland-serrate. Sepals decidnons in fruit. 

 Styles distinct. Fr. globose, tomentose. 



Fam. 41. MIMOSACE^E. 



Trees or shrnbs, rarely (Mimcsa pndica) undershrubs. 

 L. often sensitive,* 2-pinnate (pinnae and leaflets sometimes 

 reduced to one pair). Fls. small regular, collected into dense 

 spikes or globose heads with prominent stamens, but small 4-5- 

 merous perianth. Calyx tubular or campanulate, truncate or 

 valvately toothed or lobed, sometimes minute. Peta Zs valvate, 

 free or more or less connate into a tubular or funnel-shaped 

 corolla. St. as many or twice as many as the petals or num- 

 erous, hypogynous to perigynous, free or monodelphous. 

 Ovary 1-carpeJkry, 2-many-ovuled. Fruit a dehiscent or 

 indehiscent sometimes curved pod. 



I. Stamens definite, 4, 5, 8, or 10. 



a. Fls. spicate. An immense climber . . 1 Entada. 



b. Fls. in globose heads. 



Small tree. St. 10 . . . 2. Leuccena. 



Shrubs or undershrubs. St. 4 or 8 . . . 3. Mimosa. 

 II. Stamens numerous. 



o. St. free. Erect or scandent prickly trees or 

 shrubs . . .... 4. Acacia. 



b. St. monodelphous. Erect, rarely thorny or 

 prickly trees. 

 Pod thin ligulate, not twisted, not or tardily 



dehiscent . 5. Albizzia. 



Pod twisted and dehiscent .... 6. Pithecolobium. 

 Pod fleshy and indehiseeut, septate between 

 the seeds 7. Enterolobium- 



* Exhibiting sleep movements or otherwise irritable. 



284 



