The five petals of linum berlandieri
are mostly orange/yellow, becoming orange-red towards the base, and are crossed by lengthwise veins that extend the darker color a little way further. Petals are obovate in shape, slightly notched along the otherwise flat upper edge. The petals are subtended by five sepals, three longer than the other two. The flower center contains a green ovary, a yellowish style and a lobed stigma, surrounded by five stamens, which have pale yellow filaments and yellow anthers, attached at their midpoints. Flowers form as open clusters, at the ends of the branches. Flowers are up to 1.2 inches in diameter.
Stems are rigid, erect, and branch freely, mostly above the middle. The hairless leaves are closely-spaced toward the base, noticeably greyish in color, unlike the brighter-green stems, and point upwards. Leaf tips terminate in a small spike.