Very interesting, Janos.four On Saturday, 7 June 2014, J. Agoston <agoston.janos123@gmail.com> wrote: > So, thank you for all the replies! > > In my first year of university (2002) the same questions have arose in me. > > For bulb I consider a plant which has at least one scale which is for water > and nutrient storage, and this scale surrounds the bud. Examples: Allium > rosenbachianum, A. giganteum, A. sativum, A. ursinum. All of them has only > one scale. (I have pictures somewhere... in the mass of 100 000+ pictures.) > All of these scales are ment to survive one cycle. At the end the new > vegetative bud will grow another scale with at least one other vegetative > bud. > > Bulbs with many scales, but only for one cycle: The have more than one > scale, and there is one secondary bud at the bottom of each scale, plus a > big vegetative bud. The bud will make the new fleshy scales while the plant > is growing with a new bud, which will grow in the next cycle. The rest of > the scales will shrivel and decompose or make the tunic. > E.g.:Rest of Allium species, Tulips, Iris × hollandica, Fritillaria, > Leucocoryne, etc. This means you have a new bulb every year. In this > regards Fritillaria is more close to Tulipa then to Lilium. > And for Fritillaria I have a picture taken this year to rove it, but still > i have to find it :/ > > Bulbs with many scales and the scales exists more than one year: > The outer scales shrivel, decompose or make the tunic, the inner scales get > further from the central bud each year. The most demonstrative examples are > the Amaryllidaceae e.g. Hippeastrum, Galanthus, Narcissus and Hyacinthus. > Now for young Hyacinthus and Lilium bulbs if the growing season is optimal > the whole bulb can be renewd, mostly because the inner bulb grows so big > thath the outer scales can't keep up with the growing, and instead of > expanding they split open and transport their stored food to the newly > forming scales. But under normal conditions a mature bulb keeps the scales > for 2 or more years. > If you cut a bulb vertically and lucky enough you can see the old stems of > former years. Better yet, start peeling a Lilium bulb (from the Asiatic, > Trumpet or Oriental group) and after a few layers you can see the old stem > of the bulb. > Of course not all bulbs can be put into these groups, there are special > ones, like Lilium pardalinum, which grows a new bulb each year, and still > the old scales can be seen as Jim said with L. superbum. > > Here you can see a cut bulb of hyacinthus, the captions are in Hungarian :/ > https://lh3.googleusercontent.com/-JmHAvdBGTcM/… > > and you can see some pictures of various storage organs in my > classification > http://docstoc.com/docs/150793749/… > > Regards, > Janos > Z5a, Hungary > _______________________________________________ > pbs mailing list > pbs@lists.ibiblio.org > http://pacificbulbsociety.org/list.php > http://pacificbulbsociety.org/pbswiki/ -- Ralph Carpenter 2 & 3 Stone Cottages Chilmington Green Great Chart Ashford Kent TN23 3DW 01233 637567 _______________________________________________ pbs mailing list pbs@lists.ibiblio.org http://pacificbulbsociety.org/list.php http://pacificbulbsociety.org/pbswiki/
