16 MERRILL. 



Calliandra soman Griseb. Fl. Brit. West Ind. (1864) 225. 



Luzon, Manila, Merrill 11, Decades Philip. Forest Fl. 216, For. Bur. 10193 

 Cttrran, Saiino 403. Palawan, For. Bur. Jfl33 Curran, Bur. Sci. 878 Foxioorthy. 



A native of tropical America, introduced into the Philippines about the year 

 1860, and now widely cultivated as a shade tree in towns tliroughout the Archi- 

 pelago; subspontaneous in some localities. It is locally known as "acacia" ; 

 the rain tree of the West Indies. 



3. PITHECOLOBIUM Mart. 



Armed with spinescent stipules; seeds arillate; pinnic and leaflets 1-jugate. 



1. P. dulce 

 Unarmed; seeds without arillus. 



Pods deeply lobed between the seeds, the lobes extending more than half way 

 or quite to the upper suture and turned regularly and alternately right and 



left, dehiscent only opposite the seeds 2. P. scutiferum 



Pods only faintly or not at all sinuate on the lower suture between the seeds, 

 the dehiscence continuous. 

 Pinnae I-2-jilgate; leaflets few, medium to large, 2-3-jugate. 

 Pinnae 1-jugate. 



Leaflets 12 to 15 cm long; pods nearly straight, flattened, not at all 



twisted, 3.5 cm broad 3. P. plati/carpum 



Leaflets less than 12 cm long; pods very strongly curved, sometimes 



twisted, less than 2 cm broad 4. P. pauciflorum 



Pinnae 2-jugate. 



Leaflets 10. cm long or less; pods less than 2 cm wide. 



5. P. miiulanaense 

 Leaflets up to 20 cm in length; pods about 3 cm wide.... 6. P. elUpticum 

 Pinna; mostly 4- to 10-jugate; leaflets small, all more or less rhomboidal, 

 numerous, 5- to 20-jugate. 

 Pinnae 2-4-jugate; distal leaflets larger than the lower ones. 



7. P. angitlatum 

 Pinnae 6-IO-jugate; leaflets equal or subequal, the terminal pair not larger 

 than the others. 



Leaflets rhomboid, 5 to 10 mm wide 8. P. suhacutum 



Leaflets rhomboid-linear or rhomboid-oblong, 2 to 3 mm wide. 



9. P. prainianum 

 1. Pithecolobium dulce ,(Roxb.) Benth. in Hook. Lond. Journ. Bot. 3 (1844) 

 199, Trans. Linn. Soc. 30 (1875) 572; Baker in Hook. f. Fl. Brit. Ind. 2 (1878) 

 302; F.-Vill. Nov. App. (1880) 75; Vid. Rev. PI. Vase. Filip. (1886) 121; Merr. 

 in Philip. Journ. Sci. 1 (1906) Suppl. 61; Prain ex King in Journ. As. Soc. Beng. 

 66=" (1897) 263. 



Mimosa dulcis Roxb. PI. Corom. 1 (1795) 67, t. 99. 

 Inga dulcis Willd. Sp. PI. 4 (1805) 1005. 



Incja camatchili Perr. Mem. Soc. Linn. Paris 3 (1824) 122; C. B. Rob. in 

 Philip. Journ. Sci. 3 (1908) Bot. 305. 



Mimosa unguis-cati Blanco Fl. Filip. (1837) 731, non Linn. 

 Inga lanccolata Blanco 1. c. ed. 2 (1845) 370, ed. 3, 2: 322; Naves 1. c. pi. 237, 

 non H. & B. 



Luzon, Province of Abra, For. Bur. lJiol2 Darling: Province of Ilocos Norte, 

 Btir. Sci. 2207 Mearns: Province of Union, Elmer 5613: Province of Batangas, 

 Marave 71: Province of Rizal, Merrill 16)0: Province of Bataan, Ahem 763, 



