The word "woolly-stemmed" can be replaced with several synonyms that describe similar features of a plant. Some alternative words that can be used are "hairy-stemmed," "fuzzy-stemmed," or "downy-stemmed." These words all refer to stems that are covered with hair-like structures, making them feel soft and fluffy to the touch. Other options include "velvet-stemmed," "tufted-stemmed," or "plush-stemmed," which all suggest a similar velvety texture. Using these synonyms can add variety to your writing and help you to better describe the unique characteristics of a particular plant or organism.