478 MR. C. IVRIGilT OS JUSStiEl. 



before maturity a corky envelope of definite shape and size 

 curves round each ovule separately, in the manner of a horse- 

 shoCj but leaving it exposed above and below, and lying trans- 

 versely to the axis of the fruit. The seed is easily separated, 

 and is found with its proper testa. Embryo elliptic, the two 

 cotyledons together just as large and as long as the radicle. Tlie 

 figure in Kunth is admirable. 



X acuminata, Sw, sec. Grisebach. This has a remarkable pe- 

 culiarity of structure. In the lower part of the ovary (more 

 than half generally) the ovules are in a single series ; in the 

 upper part in more series than one. Even in tlie young ovary, 

 before flowering, it is clearly perceptible that the upper portion 

 is larger than the lower, thus indicating a difference of structure. 

 As the fruit approaches maturity, the lower uniserial seeds be- 

 come enclosed each in its definite portion of endocarp, Avhich re- 

 mains of a spongy consistence and opens outAvard by a fissure 

 as definite and as neat as if made by the most consummate art, 

 and the envelope opens like the two sides of a bullet-mould 

 ■when the time comes for the escape of the seed. But in the 

 upper part of the capsule nothing of this is seen ; the seeds lie 

 loosely together in the cells. In this part the ovules, too, are 

 slightly ascending, and suspended in the lower. 



To this belongs no. 2551, X micranfha, Kze. sec. Grisebach, 

 young plants. Also " J. acuminata, no, 998, Gardner, 1838, Per- 

 nambuco," Aw, a plant gathered on the *' Niger, AY, Trop. 

 Africa, by Dr. AV. B. Baikie, received April 18G5," but without 

 name or number. 



J. inclinata, L. ? According to my experience, this is a float- 

 ing plant, never rooting in the soil willingly. Observing the in- 

 flated stem, I suggested the name injlafa, Mr. Grisebach puts 

 it as a var. of J, repens, just because he did not look inside the 

 fruit. Ovary 4-celled. Ovules innumerable, neither ascending 

 nor suspended. Seeds unenclosed in any portion of the endo- 

 carp, elliptic ; radicle as long as the two cotyledons united. 



J. hirta, Vahl, much resembles the last in the structure of the 

 ovary, but the ovules are ascending. This is w^eil figured by 

 Kunth. 



No. 2559, ann. 18G0-1864, was returned by Mr. Grisebach as 

 J", acuminatay Sw., but it is very distinct from no. 2560. The 

 ovary is 4-celled, and the ovules numerous, very closely imbri- 

 cate, and ascending. The seeds are elliptic or oblong, slightly 

 curved, the raphe on the concave side. It is the Jiissicea decurrens 



