Jennings: Contribution to Botany of Isle of Pines. 241 



tion: Rather widely distributed through the West Indies as well as 

 through the tropics of continental America and the Old World. 



6i6. Avicennia nitida Jacquin. Black Mangrove. White Man- 

 grove . 



Avicennia nitida Jacquin, Enumeratio Plantarum Quas in Insulis Caribaeis De- 



texit, 1760, p. 25. 

 Avicennia officinalis var. nitida O. Kuntze, Revisio Generum Plantarum, IT, 1891, 



p. 502. 



Near Nueva Gerona, May 3, 1904, A. H. Curtiss, No. 312; at rear 

 margin of sandy strand at Bibijagua, May 7, 1910, 0. E. Jennings, 

 No. IIS; oi"^ strand, back of which is a mangrove swamp, along Co- 

 lombo Bay, northeast of Nueva Gerona, May 14, 1910, 0. E. Jennings, 

 No. 254; forming a large part of the innermost mangrove swamp- 

 forest near the mouth of the Nuevas River, May 16, 1910, 0. E. 

 Jennings, No. dgj. General Distribution: Along coastal borders, 

 especially where sandy, from the Bermudas, southern Florida, Missis- 

 sippi, and Texas, south through the Bahamas, the West Indies, and 

 continental tropical America; also in tropical Africa. 



The Black Mangrove (Mangle bianco, Mangle bobo. Urban) 

 forms a large part of the landward extension of the mangrove border 

 around the lower shores of the island. It becomes a good-sized 

 tree, sometimes fifty or sixty feet in height, but mostly smaller. 

 Specimen number ii^ was about twenty feet in height. The flowers 

 are a pale yellow in color. The bark is used for tanning, and the wood 

 is quite durable when placed in wet soil. 



Family LABIAT^FI. 



Key to the Species Enumerated. 



Flowers massed in dense globose heads. 



Heads sessile, 4 cm. or more in diameter, enclosing the stem. 



617. Leonotis nepetifolia. 

 Heads smaller, pedunculate. 



Leaves 5-15 cm. long, tapering below into a more or less distinct slender 

 petiole. 

 Leaves ovate-oblong; floral bracts shorter than the calyx and incon- 

 spicuous 624. Mesosphcerum capitalum. 



Leaves narrow, linear-oblong; floral bracts longer than the calyx and 



conspicuous, even in fruit 623. MesosphcBrum HoUandianuvt. 



Leaves usually subsessile; linear-lanceolate; floral bracts twice as long 

 as the head 625. Alesospharum actinocephalum. 



