122 iiR. a. BEvniAM on myrtace.e. 



This Bccckea-Qmhvyo has great analogy Avith that of tlie few 

 Euchamielaucie?e where it is known, but in a somewhat reversed 

 position. The general form is that of an obovoid mass with a 

 small narrow recurved neck ; but this neck, instead of lying flat 

 on the upper broad end, is turned up from the lower more or less 

 attenuate end, and much more distinctly divided into cotyledons 

 at the tip. This is the general type, as far as is known, in BcccJceOy 

 Scholfzia, and Micromj/rfus, varying in difiorent species in the 

 neck longer or shorter, straight or transversely folded or twisted, 

 and in the degree of development of the cotyledons. In Astartea 

 the embryo is probably the same, but as yet unknown. 



The next general type is that oi Leptospermtun, The radicle 



has lost its predominance ; it is straight, linear, and terete, as in 

 Calytlirix^ but usually reversed, and smaller than the flattened 

 cotyledons, although not so much so as in some other genera. 

 Between BcecJcea and Lcptospermum we have placed three genera 

 II Unocal ijmma^ Balcni8tion^ and Agonis. In the first, Ihjpocalymma^ 

 the stamens are nearly those of i(?^^o^/?^>-;«w;;?, of whichEndlicher 

 made it a section, the foliage that of JBcccTceaj and the embryo, as 

 far as known, nearer to that of the latter genus than of Lepto- 

 sj)ermum^ being a thick obovoid mass, the low^er somewhat atte- 

 nuate end either straight and entire or very minutely incurved 

 and notched; but I have only succeeded in examining three good 

 seeds in the whole genus. In Balaustion the embryo is entirely 

 unknown. The third intermediate genus, Agonis^ frequently re- 

 ferred as a section to Leptospermumj whicli it sometimes resembles 

 in foliage, has the stamens of BcecJcca, with the inflorescence, 

 ovules, and seeds of Melaleuca^ with whicli it also agrees in the 

 embryo, the cotyledons mucb larger, and the cotyledons much 

 smaller in proportion than in Leptospermiim. 



The remaining genera of Leptospermea^, as far as known, have 

 one general type of embryo, varying often more in species of the 

 same genus than in different genera. The cotyledons are always 

 larger and broader than the cylindrical radicle, but in various 

 proportions. The radicle is superior or inferior according to the 

 insertion of the ovule near the summit or near the base of the 

 cavity of the ovary ; it is sometimes nearly as long as the coty- 

 ledons, and straight with them or turned down over them, or 

 very short. The cotyledons are sometimes oblong, thick, and 

 almost semiterete, sometimes thick and liemispherical, or broad 

 and flat, or thin, very broad, conduplicate over the incumbent 

 radicle, or contortuplicate. They may be entire or more or \^^^ 



