Summarize:

Woody plants share very similar attributes and growth characteristics with forbs above, and many forbs actually share the same families as woody plants. For instance, caragana mentioned below is in the same family as the clover species and black medic mentioned above, which is Fabaceae, or the Legume (Peas and Beans) Family. The only thing that sets woody plants apart from their herbaceous counterparts is that the stems are not annual (grow up from seed or root growth points every year) like forbs are. The stems also form secondary tissues, primarily xylem, on the interior of the stem, and its these xylem cells, with their very strong and rigid structures, are what make up what we know as "wood." In trees and shrubs subject to seasonal changes, rings develop in the woody tissues in response to growth patterns that occur in the spring and summer. Tropical trees, however, do not form rings because the cambrium (tissue that can grow due to cell division, and makes up xylem [inside layer] and phloem [outside layer], of a plant stem) experiences active growth all year round. Flower and leaf characteristics mentioned above also apply to woody plants, exceptions are those gymnosperms, largely as coniferous plants like spruce and pine trees. Using the basic identifying characteristics described in the step above, find a plant in your garden or flower bed that obviously shouldn't be growing in there and you suspect may be a woody weed of some kind. Woody plants are characterized by structure of the leaves, flowers, seeds or fruit, stems, and growth form. Most who are new to identifying plants feel most comfortable referring to the common name of a plant, and choose to learn the species' scientific, Latin or Greek taxonomic names later. However please note that it's very common for a single plant to have more than one common name, depending on location and the language of those referring to a particular plant, so use of common names exclusively in identifying any plant, weed or not, is discouraged especially in the world's scientific community. This is because many plants have one taxonomic name, and that one taxonomic name is often the name that is easily recognized in all languages in by many people in all regions.
Understand the characteristics of woody plants. Find or locate a weed that would likely be a woody plant. Examine the plant. Make an identification guess on the species or common name of the plant.