Eryngium mathiasiae, commonly known as mathias' button-celery, is a distinctive herbaceous perennial belonging to the Apiaceae family, which also includes carrots and parsley. This species is recognized for its unique floral structures and its specific ecological niche. The plant typically exhibits an erect growth habit, forming clumps of foliage from which flowering stems emerge. Mature plants can reach a moderate height, though specific dimensions can vary with environmental conditions. The leaves of Eryngium mathiasiae are often basal, forming a rosette at the base of the plant, and can be somewhat rigid or leathery in texture. The leaf margins may be toothed or lobed, contributing to the plant's overall appearance. The inflorescence is a characteristic feature, consisting of small, dense, button-like clusters of flowers. These flower heads, or capitula, are typically surrounded by prominent, spiny bracts, which are often mistaken for petals. The true flowers are small and inconspicuous, usually white or greenish-white, and are arranged tightly within the capitulum. Following flowering, the plant produces small, dry fruits, characteristic of the Apiaceae family. Eryngium mathiasiae is native to a restricted geographic area, primarily found in specific regions of the United States, notably in parts of Texas. Its natural habitat is often associated with sandy soils, prairies, and open, well-drained areas. Cultivation of mathias' button-celery requires conditions that mimic its native environment, emphasizing excellent drainage and ample sunlight. It is well-suited to arid or semi-arid garden settings and can be a valuable addition to native plant gardens or rock gardens where its unique texture and form can be appreciated. While not widely cultivated for ornamental purposes compared to some other Eryngium species, Eryngium mathiasiae holds ecological significance within its native range. Its presence contributes to the biodiversity of its habitat, and it may provide resources for local pollinators. There is limited documented information regarding specific medicinal, culinary, or economic uses for Eryngium mathiasiae. Its primary value lies in its role within its natural ecosystem and its potential as a unique horticultural specimen for those seeking to grow plants with specific native origins and botanical interest. The plant's adaptations, such as its potentially drought-tolerant nature and its spiny bracts, likely play a role in its survival in its native, often challenging, environments.