Fl. Tellur.2: 47. 1837
sc, se United States, ne Mexico.
Species 3 (3 in the flora).
Croptilon was revised as a section of Haplopappus by E. B. Smith (1965, 1966), who later (1981) came to agree with L. H. Shinners (1951c) that the group should stand as a separate genus. It is one of the goldenaster genera (Chrysopsidinae) and is hypothesized to be most closely related to Pityopsis (G. L. Nesom 1991b), based on its production of thin-based arachnoid trichomes, narrow, parallel-nerved leaves, sclerenchymatous nerves, small heads, and terete cypselae. The genus is distinguished by its taproot, narrow, rigid, and basally ciliate leaves, turbinate, few-rayed heads in loose arrays, and chromosome numbers reduced from the x = 9 typical of the tribe and subtribe.
|1||Cauline leaf blades spatulate to lanceolate, relatively even-sized distally, margins usually entire, sometimes serrate apically; peduncles usually hirtellous to hispid, sometimes with crisp hairs as well, rarely glabrous, eglandular||Croptilon rigidifolium|
|1||Cauline leaf blades lanceolate to linear, reduced distally, becoming bractlike near heads, margins usually apically serrate, rarely entire; peduncles hispid or not, stipitate-glandular||> 2|
|2||Involucres turbinate, (2–)2.5–5 mm wide; ray florets 5–11, laminae 4–6 mm||Croptilon divaricatum|
|2||Involucres campanulate, (3.5–)5–8(–10) mm wide; ray florets (10–)13–21(–29), laminae 6–12 mm||Croptilon hookerianum|
|Author||Guy L. Nesom +|
|Etymology||Greek kropion, scythe, and ptilon, wing or feather, perhaps alluding to perceived winglike or featherlike appearance of curved, pinnately toothed leaves, the allusion to “feather” explicit by Rafinesque, “col. feather,” but not explained +|
|Illustrator||Barbara Alongi +|
|Reference||smith1965a + and smith1966a +|
|Synonym||Haplopappus Isopappus +|
|Taxon name||Croptilon +|
|Taxon parent||Asteraceae tribe Astereae +|
|Taxon rank||genus +|
|Volume||Volume 20 +|