132 



RUMPHIUS'S HERBARIUM AMBOINENSE 



Arum aegyptium Rumphius describes eight forms or varieties, 

 and under Caladium aquatile two, all of which are reducible to 

 Colocasia esculenta Schott, sensu latiore. I cannot agree with 

 W. F. Wight, Contr. U. S. Nat. Herb. 9 (1905) 206, in interpret- 

 ing the genus Caladium as typified by the Rumphian description. 

 The type of Caladium, the plant figured, and the one to which the 

 description applies, is Caladium bicolor Vent. 



TYPHONIUM Schott 



TYPHONIUM DIVARICATUM (Linn.) Decne. in Nuov. Ann. Mus. Paris 

 3 (1834) 367; Blume Rumphia 1 (1835) 130 var. ROBUSTUM 

 Kunth. Enum. 3 (1841) 26. 

 Arum divaricatum Linn. Sp. PI. ed. 2 (1863) 1369. 

 Typhonium javanicum Miq. Fl. Ind. Bat. 3 (1857) 193. 

 Arisarum amboinicum Rumph. Herb. Amb. 5: 319, t. 110, f. 2. 



This species is not represented in our Amboina collections. 

 The reduction and synonymy follow Engler, in DC. Monog. Phan. 

 2 (1879) 612. Linnaeus referred it to Arum trilobum Linn., 

 in Stickman Herb. Amb. (1754) 22, Amoen. Acad. 4 (1759) 

 131, and to A. trilobatum Linn., in Syst. ed. 10 (1759) 1251, Sp. 

 PI. ed. 2 (1763) 1369, in which he was followed by all authors 

 until Blume placed it under Typhonium divaricatum Decne. 

 Hasskarl, Neue Schlussel (1866) 127, placed Arisarum amboini- 

 cum as the equivalent of Typhonium divaricatum Decne.; but, 

 probably through oversight, he did not cite the figure. 



PI ST I A Linnaeus 

 PISTIA STRATIOTES Linn. Sp. PI. (1753) 963. 

 Zala asiatica Lour. Fl. Cochinch. (1790) 405. 

 Pistia minor Blume Rumphia 1 (1835) 78 (type!). 

 Plantago aquatica Rumph. Herb. Amb. 6: 177, t. 7h, f. 2. 

 Plantago aquatica II minor Rumph. Herb. Amb. 6: 177. 



This common and well-known species is not represented in our 

 Amboina collections. The reduction to Pistia stratiotes Linn, 

 was first made by Linnaeus, in Stickman Herb. Amb. (1754) 28, 

 Amoen. Acad. 4 (1759) 136, Syst. ed. 10 (1759) 1249, which has 

 been followed by practically all authors. Loureiro, Fl. Cochinch. 

 (1790) 405, cites it under Zala asiatica Lour., a synonym of Pistia 

 stratiotes Linn. The form described by Rumphius as Plantago 

 aquatica II minor is the whole basis of Pistia minor Blume, which 

 is manifestly only a reduced form of Pistia stratiotes Linn., due 

 to habitat. The plant is enormously variable in size, depending 

 on the age of the individuals, habitat, etc., the tendency, where 

 the plants are very numerous and crowded, being to a great 

 reduction in size. 



