Gutierrezia serotina
Gutierrezia pomariensis
late snakeweed
orchard snakeweed, Uinta Basin snakeweed
glabrous.
sparsely scabrous or glandular-scabrous to glabrate.
basal absent at flowering;
cauline blades 1-nerved, linear to filiform, 0.5–1 mm wide, reduced distally.
basal absent at flowering;
cauline blades 1-nerved, linear, 0.5–2.5 mm wide, slightly reduced distally.
narrowly campanulate (lengths ± equaling diams.), 3–4 mm diam.
cylindro-turbinate to turbinate-campanulate, 3–5 mm diam.
4–9;
corollas yellow, 2.3–4(–5.4) mm.
(4–)5–7(–8);
corollas yellow, 2–5 mm.
(8–)10–12(–17).
5–15.
borne singly or (sessile in glomerate clusters of 3–5) in loose arrays.
borne singly or in pairs on bracteate peduncles, or some almost sessile, in loose arrays.
1–1.2 mm, faces densely strigoso-sericeous (hairs ± twisted, apically attenuate);
pappi of 1–2 series of oblanceolate scales 0.5–1 mm.
1–2 mm, faces without oil cavities, loosely strigose;
pappi of 1–2 series of oblong-lanceolate scales 1–2 mm.
apices flat.
apices (green, broadly rounded), thickened, (prominently gland-dotted).
= 8.
= 32.
Gutierrezia serotina
Gutierrezia pomariensis
Gutierrezia pomariensis is similar to G. sarothrae and sympatric with it; the two are ecologically distinct, with G. pomariensis occupying drier habitats. “Intermediates in a populational sense are few and apparently confined to the ecotone in places where the two taxa grow nearby” (A. Cronquist 1994).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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