Have knowledge of USDA Noxious weeds and regulations?

My husband grows aquatic plants for aquarium hobbyists. He has recently learned that two of the plants he grows, limnophila sessiflora, and hygrophila polysperma, are designated as “noxious plants” and their transport is regulated here in the US. What we need to know are three things…
1. Would all subspecies of these plants be included as noxious weeds even if the specific subspecies is not specified by the USDA noxious weed list? Specifically, he grows the “tropic sunset” variety of hygrophila.
2. What are the penalties for selling and transporting these plants within the US?
3. Is it difficult to obtain permits for plant transport for private sale for aquarium use?

We have already tried searching the USDA website and cannot find answers to these questions.
To Amy L. – thanks for the additional information despite the condescending attitude and off-base assumptions you have made. My husband bought his plants from a reputable dealer – they did not tell us that these plants were restricted, and we incorrectly assumed that if he was selling them, they were legal. My husband only sold two batches of plants before finding out they were on the noxious weed list, he has since stopped selling until we are more educated on the policies, and receive a permit for transport. I asked of legal consequences in case those two previously sold batches came back to haunt us, NOT to skirt the law for future sales.
He pays taxes on his income. And he knows the environmental consequences of noxious weeds and has NEVER disposed of any plant in an irresponsible manner. We are asking these questions not to evade the law or work around the system, we are asking so that we can be responsible plant growers and sellers.
But thanks for assuming the worst!