共查询到20条相似文献,搜索用时 31 毫秒
1.
2.
3.
FINN N. RASMUSSEN 《Botanical journal of the Linnean Society. Linnean Society of London》1985,91(4):447-456
RASMUSSEN, F. N., 1985. The gynostemium of Bulbophyllum ecornutum (J. J. Smith) J.J. Smith (Orchidaceae) . Stages in the development of the gynostemium of Bulbophyllum ecornutum demonstrate that the pollinium stalk is a hamulus in this and in a closely related species, B. gibbolabium . A hamulus arises by apical growth and reflexion of the median carpel. Hamuli have recently been discovered in several orchid genera, and a transverse fold of the rostellar apex is already known from a large group of orchids. The closely related B. cornutum has a quite different gynostemium structure. 相似文献
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Isozyme uniformity in a wild extinct insular plant, Lysimachia minoricensis J.J. Rodr. (Primulaceae)
Isozyme analyses were conducted to evaluate the genetic diversity of seed accessions of Lysimachia minoricensis (a Balearic endemic plant that became extinct in the wild) provided by 10 European botanical gardens. No isozyme variation was detected after examination of the electrophoretic patterns of 22 putative loci in more than 150 plants. The lack of genetic variation in L. minoricensis is probably due to the shortage of sample propagules originally recovered in the field before its extinction. Extant plants of L. minoricensis are believed to have originated from a single source, therefore limiting their use as seed stocks for restoration projects. 相似文献
19.