Trans. Linn. Soc. London16: 203. 1830
Warm regions of North America, Mexico, Central America.
Species ca. 41 (5 in the flora).
Acourtia consists of two clades, one with species that have scapiform stems and the other with species that have leafy flowering stems. From about 1873 to 1973, Acourtia species were treated as members of Perezia, usually as Perezia sect. Acourtia (D. Don) A. Gray. J. L. Reveal and R. M. King (1973) reestablished Acourtia for the leafy-stemmed North American species, and B. L. Turner (1978) added the scapiform species. Molecular evidence (H. G. Kim et al. 2002) indicated Acourtia is most closely related to Proustia and Trixis and not to Perezia.
|1||Leaves basal (blades pinnately lobed); heads borne singly (or 2–3, on scapiform peduncles).||Acourtia runcinata|
|1||Leaves cauline (blades not pinnately lobed); heads borne singly (at tips of branches) or in corymbiform or paniculiform arrays||> 2|
|2||Plants 2.5–30 cm; leaf blades rhombic-orbiculate to suborbiculate (hollylike, lengths about equaling widths)||Acourtia nana|
|2||Plants 30–150 cm; leaf blades elliptic, elliptic-oblong, lance-oblong, oblong-lanceolate, oblong-ovate, oval, ovate, or ovate-elliptic (not hollylike, lengths mostly greater than widths)||> 3|
|3||Leaf blades oval to ovate-elliptic; phyllaries acuminate; florets 3–6||Acourtia thurberi|
|3||Leaf blades elliptic, elliptic-oblong, oblong-lanceolate, or oblong-ovate; phyllaries obtuse to acute or mucronate; florets 8–20||> 4|
|4||Leaf margins dentate to denticulate; phyllary apices obtuse to shortly acute; florets 8–12||Acourtia wrightii|
|4||Leaf margins spinulose-denticulate; phyllary apices acute to acuminate or mucronate; florets 10–20||Acourtia microcephala|
|Author||Beryl B. Simpson +|
|Common name||Desertpeony +|
|Etymology||For Mrs. A’Court, a British amateur botanist +|
|Illustrator||Yevonn Wilson-Ramsey +|
|Reference||bacigalupi1931a +, r1992a +, r2001a +, reveal1973b +, turner1978a + and turner1993b +|
|Taxon name||Acourtia +|
|Taxon parent||Asteraceae tribe Mutisieae +|
|Taxon rank||genus +|
|Volume||Volume 19 +|