Flora of North America species comparison

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Amauriopsis dissecta

ragleaf bahia, yellow ragweed
Leaf

lobes (3–)7–25(–75+), ovate to oblong or lanceolate to lance-linear, 4–12(–25+) × (1–)2–6(–12+) mm.
Involucres

5–7+ × 10–18+ mm.
Ray laminae

5–10+ mm.
Disc corollas

2.5–3(–4+) mm, ± stipitate-glandular.
Cypselae

2.5–4+ mm.
2n

(= 3x) = 36.

Amauriopsis dissecta
Phenology Flowering (Jun–)Aug–Sep(–Oct).
Habitat Usually on sandy or gravelly soils, openings in pinyon-juniper, yellow pine, or spruce-fir forests
Elevation 1600–2900 m (5200–9500 ft)
Distribution
from FNA
AZ; CA; CO; NM; NV; TX; UT; WY; Mexico (Baja California, Chihuahua, Coahuila, Sonora)
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[BONAP county map]
Discussion

W. L. Ellison (1964) reported “n = 18, metaphase II,” based on observation of meiosis in a microsporocyte. D. J. Keil et al. (1988) noted that anthers are often abortive and meiosis is irregular and that seed set is usually high in A. dissecta. Keil et al. suggested that A. dissecta is an apomictic triploid derived from a cross between a diploid plant with n = x = 12 and a tetraploid plant (or unreduced gamete) with n = 2x = 24 so that for A. dissecta 2n = 3x = 36.

Some plants (from Arizona, Baja California, and New Mexico) with poorly developed ray corollas and ± hairy cypselae bearing pappi of 1–13 lance-linear to lance-subulate scales have been identified as belonging to Amauriopsis dissecta. Such plants may be hybrids resulting from crosses between A. dissecta and some other pappose species.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 393.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Amauriopsis
Synonyms Amauria dissecta, Bahia dissecta
Name authority (A. Gray) Rydberg: in N. L. Britton et al., N. Amer. Fl. 34: 37. (1914)
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Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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