Definitely a water hickory. They usually have bark like a shag-bark (we have both here), but the seeds are exactly like in the picture, dark, wrinkled, and flattened, whereas shag-bark hickory nuts are rounded and tan. The leaves make the difference obvious too, when they eventually come out.

Okay let's start over with more details this time, as I tend to be a rather terse writer by habit of scientific training and left out several important details, which were needed by everybody!! I live in MA zone 5 (maybe zone 6B), but the plants in question are not in zone 5/MA. Both trees are growing in and will stay in the tropics. None of the plants in the pictres will be coming to MA zone 5 - getting a plant through customs is such a hassle! Currently (in the tropical location of these trees) it's the hot/rainy season, as opposed to the hot/dry season, so this is the ideal planting time (different latitudes have different agricultural seasons). My desire is to learn the Latin names of these plants in order to do further research on their growth habits and cultivation. The only information I have about these plants is that they do grow in this environment, as several families in the area own them, and I know their common names. For example the ficus has a local common name of Laurel Pinto.... I can't find that on the internet or in my books. Unfortunately a common name is to generic to learn more about the plants in question.

The other one I was thinking of is Sarcococca or Sweet Box. However, it is said to flower in late winter or early spring, so doesn't fit there. And the various species produce red or black berries, which weren't mentioned. I double-checked the Choisya, and Southern Living Garden Book says it is hardy to 15, so it might make it through your winters, if that is what it is. The tubular flowers on the vine lead me to say it is Mandevilla, rather than a rose or clematis.

The link is from UF. This tree likes to live in zone 5B through 7B. Also this link says the plants do not tolerate heat well. All parts of the tree are poisonous. Says:should be grown in a spot protected from full day sun, with very well-drained, alkaline pH soil and high organic matter. It tolerates alkaline soil but not wet soil, and does not grow well in soil below pH 7.0. The link contains more info. Here is a link that might be useful: Laburnum spp.: Goldenchain Tree