Because of the Rhoynar influence, Dornish laws pass inheritance to the eldest child, regardless of gender (I: 690. SSM: 1)
The Dornishmen have olive skin and black hair, typically (THK: 465)
The Dornishmen have warred against the Reach and Storm's End for a thousand years (II: 233)
Dornishmen from the deserts wrap silk scarves around their helms to ward off the sun (III: 241, 430)
The men of the Reach have many crude japes concerning the Dornishmen (III: 429)
Dornishmen favor round metal shields and short throwing spears or double-curved Dornish bows they use skillfully from horseback (III: 430)
There are three sorts of Dornishmen, as King Daeron I had observed. There are salty Dornishmen who live along the coasts, lithe and dark with smooth olive skin and long black hair; sandy Dornishmen who live in the deserts and the long river valleys, who are even darker, faces burned brown by the hot Dornish sun; and stony Dornishmen who live in the passes and heights of the Red Mountains, the biggest and fairest, sons of the Andals and the First Men, brown-haired or blond with faces that freckled or burned in the sun (III: 430)
The salty Dornishmen have the most Rhoynish blood, the stony Dornishmen the least (III: 430)
Dornish lords wear silk and satin robes with jeweled belts and flowing sleeves (III: 431)
Dornish lords favor armor that is heavily enameled and inlaid with burning copper, shining silver, and/or soft red gold (III: 430, 431. SSM: 1)
The fabled sand steeds of Dorne are smaller than proper warhorses and cannot bear such weight of armor, but it is said that they can run for a day and a night and another day and never tire. They are all slim and swift with long necks and narrow beautiful heads and their coats are red, gold, or even pale grey or black as well. One example is black with a mane and tail the color of fire, which may be natural or dyed (III: 431)
Rhoynish influence in Dornish customs gives a special status to mistresses, or paramours as they name them, that places them above mistresses in the rest of the Seven Kingdoms but beneath wives. Dornish women of rank can also have their own paramours, and paramours may be of the same gender (III: 431. SSM: 1, 2, 3)
Dornish tastes in food and wine are markedly different from those of the Seven Kingdoms, preferring hot spicy meals and strong wine without much sweetness (III: 434)
In Dorne of old before the Martells married Daeron II, it was said that all flowers bow before the sun, meaning the Tyrells (III: 437)
Marchers say that the Dornishmen are liars, and famous for it, but the Dornish say the same of them (III: 496)
Dornishmen are fond of spears (III: 794)
Besides the three types of Dornishmen identified by King Daeron I, there's a fourth group who are called the orphans, who ply the Greenblood in poleboats (TSS: 99, 100)
Sand sledges may be used instead of wayns to cross the Dornish deserts (TSS: 101)
Dornishmen speak with a drawl, and it's said that the way they speak the Common Tongue is siced with the flavors of the Rhoyne but remains comprehensible (IV: 6. V: 17)
In Dorne, brothels are called pillow houses (IV: 31)
Brothels in Dorne are called pillow houses, and the women in them pillow girls (IV: 186)
Dornishmen are said to be hot-blooded, quick to anger and slow to forgive (IV: 187)
In Dorne, it's claimed that women would duel, bare-breasted and knife to knife, over a man (IV: 190)
In the Reach, it's said that the fiery spices and strange spices are the reason for why Dornishmen have such hot tempers, and Dornishwomen are so wild and wanton (IV: 190)
Dornish throwing spears have short, thick shafts while fighting spears can be shorter and even thicker (IV: 293, 295. SSM: 1)
Some Dornishmen may believe that when they die, their souls return to Dorne (IV: 296)
The orphans of the Greenblood pole their boats up and down the river, fishing, picking fruits, and doing whatever work is required. They dance and sing on the river, and are also said to have great knowledge of the healing arts, able to cure warts and produce the best midwives (IV: 306)
Dorne is the least populous of the Seven Kingdoms, though many outside of this do not realize it because of Daeron I's account of his conquest of Dorne, in which he inflated the numbers of the enemy to glorify his victories, and the Princes of Dorne have been happy to allow the rest of the realm to believe this (IV: 598)
The Dornishmen have ships, although not many compared to some other houses (SSM: 1)
Rhoynish customs impacted Dorne in a number of ways, especially in the rights of women, but it did not extend to women taking active part in battles (SSM: 1)
Dornishmen wear lighter armor than in the rest of the Seven Kingdoms, because of the heat (SSM: 1)
Dornishmen use different tactics than the rest of the Seven Kingdoms, generally avoiding pitched battles and depending on the speed of their lightly armored men and their swift horses (SSM: 1, 2)
Even during a long summer, there is enough rain and other supplies of water to keep Dorne habitable (SSM: 1)
There is a stigma attached to homosexuality everywhere in the Seven Kingdoms, save in Dorne (SSM: 1)