Dioecious. Plants 3–14 cm (bases woody). Stolons none. Basal leaves absent at flowering. Cauline leaves linear-lanceolate to cuneate-oblanceolate, 11–35 × 2–6 mm, acute, not flagged (apices acute), faces gray-pubescent. Heads 3–25 in corymbiform to paniculiform arrays. Involucres: staminate 6–8 mm; pistillate 6–8 mm. Phyllaries distally red to pink, light brown, or white. Corollas: staminate 3–4.5 mm; pistillate 5–6 mm. Cypselae 2–2.5 mm, pubescent and papillate; pappi: staminate 6–7 mm (capillary); pistillate 6–7 mm. 2n = 28.
Species 5 (5 in the flora).
|1||Ray lamina apices entire or obscurely to slightly lobed (mid lobes shorter than outers); disc cypselae ± prismatic (not obcompressed)||> 2|
|1||Ray lamina apices usually ± equally 3-lobed (laminae sometimes inconspicuous); disc cypselae obcompressed||> 3|
|2||Cypselae ca. 2 mm, glabrous or sparsely hairy (branches spreading, usually distal)||Monolopia gracilens|
|2||Cypselae 2.5–3 mm, uniformly gray-strigose (branches erect)||Monolopia stricta|
|3||Ray laminae ca. 0.5 mm (inconspicuous); disc cypselae 2-angled (pappi of 2–7 scales)||Monolopia congdonii|
|3||Ray laminae 8–20 mm; disc cypselae 4-angled (pappi 0)||> 4|
|4||Phyllaries distinct or connate (± 1/2 their lengths); cypselae uniformly gray-strigose||Monolopia lanceolata|
|4||Phyllaries connate (± 3/4 their lengths, forming cups with distinct triangular lobes); cypselae glabrous or apically hairy||Monolopia major|