This is a good question from GS, since GCB doesn't thoroughly discuss veggies in his English-language writings that I've seen and instead focuses much more on tropical fruits.
GCB has said in this forum and elsewhere that he recommends tropical fruits in part because he believes they are likely most like the fruits of what was humanity's "original" tropical-paradise habitat to which we would be genetically adapted. For example:
"The very concept of instinct is a genetic one. To sort out the matter required first defining what could be termed man's initial dietary bandwidth, i.e. the kind of foods that our ancestors came across in their primitive habitat in the far-removed times when our genetic background was evolved." --GCB, Anopsology
"This deficiency in the local array would also be a reason to think that our bodies are better adapted to tropical climates, where lacks neither cassia nor the fruit best suited to the human palate such as coconut, durian, jackfruit, cempedak, safu, papaya, mango, custard apple, longan, rambutan... the list is long and far more pleasant than the colder climate fruits range." --GCB, RPF
the wild fruits of the temperate land (apples, pears, corms) are often much more inedible than tropical fruits in the wild (cempedak, jackfruit, coconut, durian, avocado, etc.). This would be a reason to think that we are better adapted to tropics than to temperate regions
"we are no longer placed in an environment close to the one where our genome evolved, thus a series of precautions must be taken". --GCB,
http://www.rawpaleoforum.com/instinctoanopsology/explain-instincto-diet-fully-2/70/?wap2 and
http://www.rawpaleoforum.com/instinctoanopsology/instinctos-tropical-paradise/msg39888/#msg39888(Translated from French)
"These comments were obviously reassuring: the original environment in which the instinctotherapy way of life was necessary was something real to which our genetics have adjusted. But why are these areas [full of edible wild tropical fruits] so rare on the planet? Simply because there are few apes left practicing [unconscious] permaculture. Like when they eat fruit or other natural food, they carry a certain amount with them or in their hands or in their gut, so that the seeds spread and they thus spread the plant species they prefer. They create and reproduce and, over time, create the food environment that suits them. As our tastes are very similar to theirs, then it is only in the regions where these primates [flourish] that we find edible wild fruits, ie suitable to our taste buds and the rest of our body." --GCB, Fruits sauvages au kilomètre, Instincto Magazine, 43-44, Juillet-Aout 1991,
http://www.reocities.com/HotSprings/7627/IM43-fruitssauvages.html [In other words, humans are much like frugivorous apes and our natural "original environment" was bountiful in fruits of the type that frugivorous apes prefer.]
Presumably therefore, he would recommend tropical veggies too, yes? Do you know which tropical veggies he recommends beyond okra?
He mentioned the following veggies in Anopsology:
tomatoes: "The tomato is native to South America. Genetic evidence shows the progenitors of tomatoes were herbaceous green plants with small green fruit and a center of diversity in the highlands of Peru" where the "climate is dry and temperate"
http://en.wikipedia.org/wiki/Tomato and
http://www.hotelessanagustin.com.pe/Peru_Travel_Guide.pdfred cabbage: "It can be found in Northern Europe, throughout the Americas, and in China."
http://en.wikipedia.org/wiki/Red_Cabbage chicory: "It lives as a wild plant on roadsides in its native Europe"
http://en.wikipedia.org/wiki/Chicorycarrots: "the wild carrot Daucus carota, native to Europe and southwestern Asia"
http://en.wikipedia.org/wiki/Carrotscelery: probably Greece
http://en.wikipedia.org/wiki/Celeryspinach: "native to central and southwestern Asia"
potatoes: Andes mountains (mostly temperate to cool climate)
sweet potatoes: native to the tropical parts of South America
http://en.wikipedia.org/wiki/Sweet_potatoThe only veggie mentioned that appears to be native to a warm tropical environment is the sweet potato, and even that is a New World plant, rather than one originating from or related to a plant in the regions of Africa where most of the genetic material of homo sapiens sapiens is hypothesized to trace back to (along with a current estimate of 1-5% of matrilineal DNA tracing back to Eurasian Neanderthals, which could rise somewhat in the future as more evidence is acquired).