Do all flora possess the capacity to be cloned or viably reproduced from their trimmings, offcuts, and so on?
Or is this trait exclusive to certain varieties; or specific (cultivars) taxa?
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The term you need is actually 'vegetatively propagated' rather than 'cloned'. The answer is, essentially, yes, by and large, almost all plants can be vegetatively propagated, though different parts of the plant may be used and the methods used will vary, along with the level of difficulty. Parts which can be used include leaves, stems, shoots, bulbs, rhizomes, stolons, buds and so on.
'Clone' means an exact duplicate of the parent plant, but where plants are chimeric (variegated Sansevieria, for instance) leaf cuttings, whilst they certainly produce new plants, are very unlikely to be variegated, so the cuttings are not clones, though they are vegetatively propagated. Equally, if you took a cutting from a rose and grew it on, it would not be a clone of its parent unless you also took a cutting from the rootstock, grew that on, then grafted the rose cutting onto the cloned rootstock; only then would it actually be a clone.
What varies is the degree of difficulty with vegetative propagation - plants without vascular cambium are harder to propagate, but each variety of plant may need different methods to get success, so if you want to propagate something, it's best to check out the particular plant and its recommended propagation beforehand. More reading on vegetative propagation generally here https://en.m.wikipedia.org/wiki/Vegetative_reproduction
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1Made me curious. Looks like Welwitschia mirabilis has fallen to this vegetative propagation: bihrmann.com/Travel/NAM/W-Project-en.pdf Seemed to me like one of the last things that'd go. – Wayfaring Stranger Feb 3 '17 at 15:21
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@WayfaringStranger I don't have enough storage on my device to look at your link, unfortunately - usual means of propagation is by seed though – Bamboo Feb 3 '17 at 17:24
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They managed to take individual male cotyledons, tease them apart, grow in auxin and cytokinins, then further divide the growing masses. Abscisic acid treatment turns the little cell blobs into plants. This is all on page 21-22 of pdf. Yes, seeds are the usual way to go. To paraphrase: they could not get somatic embryogenesis using methods which can be used on other Gymnosperms, but they managed to multiply from cotyledons. – Wayfaring Stranger Feb 3 '17 at 18:19
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@WayfaringStranger thanks for the precis, interesting. What a performance though, but as its getting close to endangered, probably a useful experiment. – Bamboo Feb 3 '17 at 18:32
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Sorry; why exactly aren't plants that are propagated from cuttings, considered clones? Surely they're genetically identical to the the plant they came from? – tjt263 Feb 5 '17 at 23:46
