198 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 13 



of the upper beach, elev. 5 feet. Flowers pink with a yellow spot on 

 banner. 



Common in the tierra caliente from Mexico to South America and 

 the West Indies. This tree is often planted for shade in the cacao plan- 

 tations. 



OXALIDACEAE 



OxALis Neaei DC, Prodr. 1 :690. 1824. 



Port Parker, Salinas Bay, March 26, Elmore E12. 



In moist soils from southern Mexico to tropical South America. It is 

 frequent as a weed in cultivated ground. 



Meliaceae 



Cedrela mexicana Roem., Fam. Nat. Syn. 1:137. 1846. 



Golfo de Dulce, March 26, Elmore F6y in moist shaded humus of 

 the jungle, elev. 10 feet. 



In the tierra caliente from central Sinaloa south through southern 

 and eastern Mexico and south through Central America to Brazil. In 

 groves this tree forms long straight boles of commercial timber of soft 

 wood ; one of the species that supplies the Spanish Cedar of commerce. 



Malpighiaceae 



Byrsonima crassifolia (L.) DC, Prodr. 1:579. 1824. 



Port Parker, Salinas Bay, March 24, Ehnore El 6, dry sandy soil on 

 a dry stream bank, elev. 50 feet. Flowers yellow and orange. 



Widely distributed and common in many areas on coastal hill slopes 

 and with higher grasslands from central Sinaloa through southern Mexi- 

 co, Central America, the West Indies, and northern South America. 



Stigmaphyllon Lindenianum Juss., Arch. Mus. Paris 3:362. 

 1843. 



Golfo de Dulce, March 28, Elmore F19, shaded in dry forest humus. 



Common in the tierra caliente from southern Mexico to Panama. 

 The leaves of this woody vine vary from deeply 3-lobate to nearly ovate 

 entire. In the field it can be distinguished from most other species by the 

 dentate leaf margins. In the above collection the dentations are remote. 



Polygalaceae 



Securidaca diversifolia (L.) Blake, CN.H. 23:594. 1923. 



Poly gala diversifolia L., Sp. PL 703. 1753. 



Port Parker, Salinas Bay, March 24, Elmore E9, moist sandy soil 

 on a dry stream bank, flowers dark lavender. 



From Jalisco and Tamaulipas, Mexico south through Central Ameri- 



