Isocoma tenuisecta
Isocoma humilis
burrow goldenweed, burroweed, shrine jimmyweed
Zion goldenbush, Zion jimmyweed
minutely hispidulous to hirtellous or sparsely puberulous (at least distal stems), not resinous.
villosulous or tomentose to sparsely hispidulous (hairs short, crisped, white), not resinous.
blades oblong-oblanceolate, 20–35 mm, margins pinnatifid (lobes spreading at right angles, linear to filiform).
blades narrowly oblanceolate, 5–10(–18) mm, margins usually toothed or lobed (teeth or shallow lobes in 1–2(–3), pinnately arranged pairs), sometimes entire.
4–6.5 × 2–2.8 mm.
5–6 × 6–7 mm.
8–12(–15);
corollas 4.5–6 mm.
19–28;
corollas 4–5 mm.
apices with small, sharply delimited, green resinous area, not aristate, often distinctly thickened and approaching resin pockets, usually gland-dotted.
apices greenish, not aristate, gland-dotted, without resin pockets.
ribs not forming hornlike extensions.
ribs not forming apical horns.
Isocoma tenuisecta
Isocoma humilis
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.)
Of conservation concern.
Isocoma humilis is known only from Washington County. It is recognized by its low stature (mostly 4–8 cm) and rounded habit, villosulous vestiture, small, toothed leaves, relatively large, many-flowered heads borne singly or in pairs, and small corollas and cypselae.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
WildflowerSearch
iNaturalist
USDA Plants Database
