Not to be semantically confused with :
Cape Pigweed (Amaranthus capensis),
Cape-Pondweed (Aponogeton distachyos),
Cape Cudweed (Gnaphalium undulatum),
Cape Tulip (Homeria collina),
Cape Marguerite (Osteospermum ecklonis),
Cape Wattle (Paraserianthes lophantha),
Cape Figwort (Phygelius capensis), Cape Gooseberry (Physalis peruviana) or Caper Spurge (Euphorbia lathyris), [plants with similar names belonging to differing families]
There is only one plant in the Crinum genus which escapes in the UK somewhere; but there are many others (about 130) World-wide.
It is a garden escapee, not occurring natively. It grows on Jersey and from the early 1950's it has been growing on Alderney. It is persistent and spreads on these warm sand-duned lands. On the Sefton Coast it was conveniently planted just beyond the garden wall, again on sand dunes, but where it might not start spreading until global warming in mid-England catches up with that of the Channel Islands, in maybe another 60 years (sooner if Donald doesn't pull his Trumps out!)...
CRINANES FOUND IN POWELL'S CAPE-LILY
Crinine type alkaloids have a 5,10b-
EthanoPhenanthridine nucleus at their heart (that is the three 6-membered rings). They possess a wide range of interesting medicinal effects such as exhibiting immuno-stimulant, anti-viral, anti-microbial, antineoplastic (acting to prevent, halt or inhibit the development of a tumour - a term which is applicable to dozens of chemotherapy agents) and analgesic properties. They are also toxic.
Crinanes compounds are named after the Crinum genus in which the alkaloid was first found. The
crinane skeleton of Crinane compounds, where any R (radical) can be any radical, for instance in Crinane itself, the right-most radical is -OH, the left-most two conjoined methoxy (-O-CH3) moieties, all the other radicals are just -H. The very differing names of these very similar alkaloids reflects the wide variety (about 130) of the differing plants in the 'Amarilladaceae' sub-family in which these compounds are also found. In fact, Powell's Cape-Lily has but a small subset from those alkaloids (about 14 - there were two your Author could not find the structural formulae for). Notice the single nitrogen atom is shared by conjoined 6- and 5-membered rings. These alkaloids are all toxic to various degrees, the toxicity probably modulated by the extra moieties attached to the molecules, especially any epoxy groups.
Crinamine (above left) and Haemanthamine (below left) seem to be stereoisomers of each other. Haemanthamine, which is also found in Wild Daffodil, is named after the Heamantheae tribe (which is one of the tribes within the Amarylidoideae sub-family).
Crinamidine (above right) and
Undulatine (below right) have an epoxy moiety breaking the double-bond.
DiHydroHaemanthamine has one of the double-bonds in Haemanthamine broken, and 2 extra hydrogen atoms.
Powelline is obviously directly named after Powell's Cape-lily in which it is found.
Haemultine lacks any group on the lowest 6-membered ring.
3-AcetylPowelling has an acetyl moiety on top of the 6-membered ring with the nitrogen atom.
All the alkaloids on the left have an -OH moiety on the 5-membered nitrogen ring, even
Krepowine has an acetyl moiety on the lower 6-membered ring. The -OH moiety on the 5-membered nitrogen ring is absent from all the alkaloids on the right. How's that for grouping?