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. nilida 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; on 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.E. 



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 capitalutn. 



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



conspicuous, even in fruit 623. Mesospharum Hollandianum. 



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

 as the head 625. Mesospharum aclinocephalum. 



