Gutierrezia microcephala
Gutierrezia pomariensis
small-head snakeweed, sticky snakeweed, threadleaf snakeweed
orchard snakeweed, Uinta Basin snakeweed
glabrous or minutely hispidulous.
sparsely scabrous or glandular-scabrous to glabrate.
basal and proximal absent at flowering;
cauline blades 1-nerved, linear or filiform to narrowly oblanceolate or lanceolate, 0.5–2.2(–4) mm wide, little reduced distally.
basal absent at flowering;
cauline blades 1-nerved, linear, 0.5–2.5 mm wide, slightly reduced distally.
cylindric, 1–1.5 mm diam.
cylindro-turbinate to turbinate-campanulate, 3–5 mm diam.
1(–2; each enclosed by conduplicate inner phyllary);
corollas yellow, (1.5–)2–3.5 mm.
(4–)5–7(–8);
corollas yellow, 2–5 mm.
1, sometimes 2 (functionally staminate; corollas broadly obdeltate-funnelform, throats widely flaring, lobes 1/3 corolla lengths, recurved-coiling).
5–15.
(2–6, sessile to subsessile, in compact glomerules) in flat-topped arrays.
borne singly or in pairs on bracteate peduncles, or some almost sessile, in loose arrays.
1–1.8(–2.5) mm, faces densely strigoso-sericeous;
pappi (rays, readily falling) of 1 series of narrowly lanceolate-oblong scales.
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, 16, 24, 32.
= 32.
Gutierrezia microcephala
Gutierrezia pomariensis
Gutierrezia microcephala is recognized by its perennial habit and its small, tightly clustered heads, each with 4–8 phyllaries and 1(–2) ray and disc florets. Each ray floret is enclosed by a conduplicate inner phyllary. Forms of G. sarothrae with few florets in each head can be distinguished by their bisexual and fertile disc florets and tubular-funnelform disc corollas.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
CA
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WildflowerSearch
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