16 
MERRILL. 
Calliandra saman Griseb. FI. Brit. West Ind. (1864) 225. 
Luzon, Manila, Merrill 11, Decades Philip. Forest FI. 276, For. Bur. 10793 
Curran, Sabino 403- Palawan, For. Bur. 4133 Curran, Bur. Sri. 878 Foxworthy. 
A native of tropical America, introduced into the Philippines about the year 
1860, and now widely cultivated as a shade tree in towns throughout the Archi- 
pelago; subspontaneous in some localities. It is locally known as “acacia” ; 
the rain tree of the West Indies. 
3. PITH ECO LOB I U M Mart. 
Armed with spinescent stipules; seeds arillate; pinnae 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 1-2-jugate; 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. platycarpum 
Leaflets less than 12 cm long; pods very strongly curved, sometimes 
twisted, less than 2 cm broad pH! 4. P. pauciflorum 
Pinnae 2-jugate. 
Leaflets 10 cm long or less ; pods less than 2 cm wide. 
5. P. mindanaense 
Leaflets up to 20 cm in length; pods about 3 cm wide.... 6. P. ellipticum 
Pinnae 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. angulatwm 
Pinnae 6-10-jugate; leaflets equal or subequal, the terminal pair not larger 
than the others. 
Leaflets rhomboid, 5 to 10 mm wide , M| 8. P. subacutum 
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. FI. 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 2 (1897) 263. 
Mimosa dulris Roxb. PI. Corom. 1 (1795) 67, t. 99. 
Inga dulris Willd. Sp. PI. 4 (1805) 1005. 
Inga camatchili Perr. M4m. Soc. Linn. Paris 3 (1824) 122; C. B. Rob. in 
Philip. Journ. Sci. 3 (1908) Bot. 305. 
Mimosa unguis-cati Blanco FI. Filip. (1837) 731, non Linn. 
Inga lanceolata 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. 14512 Darling: Province of Ilocos Norte, 
Bur. Sci. 2207 M earns : Province of Union, Elmer 5613 : Province of Batangas, 
Marave 71: Province of Rizal, Merrill 1640: Province of Bataan, Ahern 763, 
