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Kalanchoe daigremontiana, Devils backbone or Mother of Thousands.
also called Bryophyllum daigremontianum
http://davesgarden.com/guides/pf/go/594/
http://www.desert-tropicals.com/Plants/Crassulaceae/Kalanchoe_daigremontiana.html

According to what I've found, it is noted to be toxic to grazing mammals.

As a result of that finding, I assume it would be toxic to cyclura and ctenos but can anyone confirm this?

This plants spreads like mad and roots a new plant anywhere so it is a concern.

Thanks

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Interesting that you find sources stating it as being poisonous, all my classify it as harmless, actualy my turts eat it all times and actively serch for it, with no harmfull efects, only growth. The web sources like world turtle trust and british turtle trust classify Kalachoe in the safe plant list for reptiles so I would say your Cyclura can live with that plant, but lets wait for more thoughs.

also, read this page: http://veterinarymedicine.dvm360.com/vetmed/Medicine/Toxicology-Brief-iKalanchoei-species-poisoning-in-/ArticleStandard/Article/detail/132513

Toxicity of Kalanchoe spp to chicks.

Williams MC, Smith MC.

Leaves of Kalanchoe daigremontiana, K tubiflora, K fedtschenkoi, K tomentosa, K tomentosa X K beharensis, and 4 cultivars of K blossfeldiana were tested for toxicity to 2-week-old Leghorn chicks. These species were analyzed for percentage of alkaloids, aliphatic nitro compounds, soluble oxalates, and nitrates and were examined qualitatively for cyanogenic glycosides. The solubility of the toxic principle in K daigremontiana was determined. Leaves of K daigremontiana, K tubiflora, and K fedtschenkoi were toxic to chicks at dosage levels of 8 to 12 mg/g of body weight. Toxic signs included depression, muscular incoordination, twitching and spiraling of the neck, tremors, convulsions, paralysis, and death. Kalanchoe tomentosa, K tomentosa X K beharensis, and 4 cultivars of K blossfeldiana were nontoxic at the highest dosage levels tested. Aliphatic nitro compounds and cyanogenic glycosides were not detected in any species. Alkaloids, nitrates, and soluble oxalates were present only in nontoxic concentrations. The toxic principle in K daigremontiana was soluble in 50%, 80%, and 100% ethanol, slightly soluble in water and acetone, and insoluble in benzene, chloroform, and ether.
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Interestingly enough, named after the chemical or vice versa,
http://en.wikipedia.org/wiki/Daigremontianin

Notes on Toxic plant chemicals:

Daigremontianin is a bufadienolide. Bufadienolides are cardiac glycosides that are similar to cardenolides, differing only in the structure of the C-17 substituent on the D ring. This chemical has been found to be toxic in experiments on mice (Wagner et al. 1985).

General poisoning notes:

Devil's-backbone (Kalanchoe daigremontiana) is an indoor ornamental plant. This plant contains a cardiac glycoside that has caused experimental toxicity and death in chicks and mice. It has caused illness in pets, such as rabbits and mice. Dogs and cats are also at risk from ingesting plant material. The plants should be kept away from children, as well. Devil''s-backbone produces plantlets along the leaf margins, which fall off and become new plants. These plantlets can be found in profusion around the pot in which an adult devil''s-backbone is growing. Children and family pets have easy access to these plantlets. Several other species of Kalanchoe may be found growing as houseplants in Canada. Tests have shown that some of them may also contain toxic bufadienalide compounds. These compounds were only recently discovered (Williams and Smith 1985, Joubert 1989), and so caution should be exercized with all species. Some members of the genus Kalanchoe have caused poisoning of sheep and cattle in South Africa and Australia, where they are native or naturalized (Cheeke and Schull 1985, Williams and Smith 1985).
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Pretty amazing never herd of it before! Thanks for sharing. My animals never showed any signs of hillness after eating it!

Here http://www.tortoisetrust.org/articles/houseplants.htm