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The fact that both seedlings has extra cotyledons actually supports the possibility that this may be due to mutation. Because once a mutation appears, it becomes heritable. Thus very probably the parent plant/s were the original mutants, or themselves the the offspring of mutants. If the mutation is...

Although the norm is one (monocots) or two (dicots) cotyledons, there are anumber of cases where extra cotyledons are present; It is probably a mutation (in your case - since both seedlings have extra cotyledons. I have often seen Ranunculus species with 3 cotyledons

Not a sedum. More like a Mesembrianthemum, but strange. One should follow it

It looks like Chenopodium album. I have seen plants growing over 2 metres

It would be a Cyperaceae. Where did you find this. Could be Carex hispida

Most probably a feral Pyrus communis. But rosaceous trees are notoriously difficult, especially due to widespread hybridisation and the presence of numerous cultivars and hybrids between cultivars are are often found growing in a feral state.

The plant in question is Beta vulgaris, the cultivated beet, which occasionally escapes

It is Holoschoenus. This is a very variable species with numerous described varieties. The var. globiferus is actually uncommon. It has smaller heads which are very numerous and the closest i've seen are plants at Migra l-Ferha.

I have examined the photos more closely and notice that some of the florets have a short awn (not present in Poa). If the plant is rather large (Poa annua is a small annual) and spikelets are about 1 cm (less than 5mm in Poa) than it most probably Schedonorus arundinaceus (= Lolium arundinaceum; for...

Agrostis stolonifera is a taller plant with larger and looser panicles; it is also perennial

It is not a hybrid since local Opc seem unable to cross-fertilise. However there are such things as somatic mutations which occasionally arise in clonal populations. Then remember that we have two distinct clones of Opc: the normal one and the flore pleno variety. Where they imported separately?

Such variants do occasionally arise in Oxalis pes-caprae. It would be interesting to cultivate such variants to see if the same happens the following year. That would establish whether the variant is genetic or due to some stress being suffered by the individual plant[/i]

I did some homework. The plant is H. hirsuta (sepals with distinct arista at the apex) but plants which are hairier, appearing greyish are sometimes distinguished as H. cinerea. Both forms occur in the Maltese Islands. Most authors consider H. cinerea as just a variant of H. hirsuta. The sub-family ...

It is certainly a Herniaria; can't quite say which

It is indeed Salsola soda

Again, I concur with JP

I concur with JP

Looks like Poa annua to me

It is not Phragmites but the very rare Ampelodesmos mauritanicus; well done. Wied Gerzuma is the only site for this species

Most probably T. resulpinatum

Euphorbia mauritanica from Morocco; frequently cultivated and occasionally escapes

Argyranthemum frutescens, native of the Canary Islands, and often found in cultivation

The brightly coloured Fumaria is F. officinalis; the whitish one could be a variant of F. officinalis (if flowers c. 9-10mm long) or F. muralis if flowers some 12mm long.

It seems to be Euphorbia [Chamaesyce] prostrata which is spreading rapidly in the past few years

Looks like Geranium dissectum

Muscari commutatum can be distinguished by the white edge to the perianth. If i recall correctly it hailed from the area known as Ta' Wied Rini where it was first descovered by Michael Briffa, a noted plant enthusiast

It is Salvia verbenaca

The stuff accompanying the sedum is a species of Nostoc (possibly N. commune) which is a cyanobacterium (=blue-green alga) which forms large gelatinous colonies. Some say it edible but i have not yet tried it out.

That's Colchicum cupanii

It is Med Thyme. There is always a certain range of variability