Amongst these are Echinacea spp. (probably more widely known as an over the counter herbal remedy for use against the common cold and other infections), liquorice (Glycyrrhiza glabra), thyme (Thymus vulgaris) and turmeric (Curcuma longa).
All these herbs have anti-mircrobial and/or anti-inflammatory properties, however it is unlikely that medical herbalists would use any of these herbs on their own to help with peptic ulceration. They will often be combined with others as part of a prescription designed to assist with more generalised healing and protection of the stomach lining. For instance, herbs which have a demulcent (anti-irritant) action, that is herbs with a high percentage of soothing mucilage, such as marshmallow root (Althea officinalis) or slippery elm (Ulmus fulva) might also be prescribed. Marigold (Calendula offinicalis) or comfrey leaf (Symphytum officinale) could also be used for, amongst a wide range of other actions, their ability to actively help heal the lining of the gut, as both are good vulnerary herbs. Chamomile (Matricaria recutita) is such a useful herb for so many conditions and peptic ulceration is no exception. Its addition to a herbal mix for peptic ulcers takes advantage of its anti-inflammatory and anti-ulcer actions. It is also great for stomach problems where there is a nervous connection, as it is a mild sedative (so often I find in practice that nervous problems are intimately linked to gastric upset), it is also healing and spasmolytic.
This information is meant for educational purposes only and not intended as a guide to self-treatment. You should always seek professional advice. Remember that herbs can interact with other drugs and may be contra-indicated if you have certain medical conditions, are pregnant or lactating. Don't take too much of anything for too long and discontinue immediately if you have any ill effects. Take care when using wild plants or any herbs, that you have the correct species from a reliable source.