兰花蕉花部维管束系统的解剖学研究

兰花蕉花梗的维管束分散排列．子房基部的维管束排成两部分，外方为一轮大维管束环，中央为分散排列的小维管束区。前者的纸管束进入子房壁，后者进入子房的中轴，形成股座纸管束；及至延长都以后，股座维管束逐渐消失．子房壁上的维管束较易识别的有心皮背束、心皮背束伴束和隔膜束．三束心皮背束经延长部最终进入花柱和柱头．心皮背束指心皮背束务与其紧靠的大维管束，三枚心皮背束伴束最终分别进入三枚外轮雄蓝．三枚隔膜束中远轴面的两枚分别进入两校内轮雄蕊，而近轴面的一枚伴随着第六枚雄蓝的缺失最后进入唇瓣中央．子房壁其余的维管束进入延长部后，先向外分出一轮纸管束进入花幕，余下的中央部分排成一轮心形的线管来环．该环远轴面的维管束分为两半分别进入两枚侧生花瓣；近轴面即心形凹陷一侧初为两轮即外轮大的维管束与内轮小的维管束，后排成一轮并与近轴面的隔膜束一同进入唇瓣．兰花蕉的唇瓣既为花瓣成员，又含一枚缺失的雄蓝维管束，与姜目已报道的只来自退化雄蕊的竹芋科的兜状结构和美人蕉科、姜科、闭鞘姜科的唇瓣有明显区别．在旅人蕉科尚未有研究资料的情况下，作者根据已有资料，对姜目雄蕊维管束系统来源和结构进行比较，初步认为在姜目的系统演化上，兰花蕉科与芭蕉料更近．

STUDIES ON VASCULAR SYSTEM ANATOMY OF THE FLOWER OF ORCHIDANTHA CHINENSIS T. L. WU

Vascular bundles of pedicel in flower of Orchidantha chinensis are scattered withinthe vascular region, but those just beneath the locule are arranged into an outer ringconsisted of large bundles and a central region with dispersed small bundles. The bundlesfrom the outer ring enter to the ovary wall and those from the central region extend to theaxis and become placental bundles which fade away gradually in prolongation. Thecarpellary dorsal bundles (cdbs), the accompanying bundles of the dorsals (abds) and theparietal bundles of the ovary wall could be easily distinguished. Three carpellary dorsalbundles finally enter the style and the stigma via prolongation. The abds, which are largebundles and each of which is adjacent to one carpel1ary dorsal bundle, separately extendinto the three stamens of the outer whorl of androecium. Two abaxial parietal bundles runupwards into the two stamens of inner whorl, while the adaxial one, accompanying theloss of the sixth stamen, enters the median of the labellum. The rest of bundles in ovarywa1l extend into prolongation and branch outwards in swelling part of the prolongation toform the outer ring of bundles, which finally run into three sepals and the remains incentral part arrange in a heart6haped ring. Abaxial bundles in convex end of heart6hapedring separate into two parts and enter to two lateral petals respectively, and the adaxialbundles in concave end of the ring firstly arrange in two rows with the large bundles inouter row and the small ones in inner row but finally become one row and along with theadaxial parietal bundle enter into labellum. It is worth to point out that this kind oflabellum, which is not only a member of corolla but also contains the bundle of the sixthlost stamen, is distinctly different from the cucullatum of Marantaceae and the labeIla inCannaceae, Zingiberaceae and Costaceae, which are only derived fr0m stadrinodes. Basingon the comparison of the origin and structure of the vascular system in androecium ofZingiberales, except Strelitziaceae- because no information could be found in this family,the authors make a prelidrinary suggestion that among the seven fadrilies of Zingiberales,Lowiaceae dright be more close to Musaceae.