Isocoma tenuisecta
Isocoma azteca
burrow goldenweed, burroweed, shrine jimmyweed
Apache jimmyweed, Aztec goldenbush
minutely hispidulous to hirtellous or sparsely puberulous (at least distal stems), not resinous.
glabrous, sometimes sparsely stipitate-glandular, not resinous.
blades oblong-oblanceolate, 20–35 mm, margins pinnatifid (lobes spreading at right angles, linear to filiform).
blades narrowly oblong to narrowly oblanceolate, 20–50 mm, margins shallowly to deeply pinnatifid (lobes in 3–8 evenly arranged pairs, apically aristate).
4–6.5 × 2–2.8 mm.
7–8 × 5–7.5 mm.
8–12(–15);
corollas 4.5–6 mm.
18–25;
corollas 5–6 mm.
apices with small, sharply delimited, green resinous area, not aristate, often distinctly thickened and approaching resin pockets, usually gland-dotted.
apices green to greenish yellow, not aristate, sparsely to prominently gland-dotted, without resin pockets.
ribs not forming hornlike extensions.
ribs not forming apical hornlike extensions.
Isocoma tenuisecta
Isocoma azteca
Some plants approach Isocoma acradenia var. acradenia in leaf and phyllary morphology in southern Arizona, where the ranges of the two taxa overlap.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Isocoma azteca is similar to I. rusbyi in most features and perhaps most closely related to it; the pinnate leaves of I. azteca are distinctive. The two taxa are essentially contiguous in range along the New Mexico-Arizona border and their interaction in natural populations needs to be studied.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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