Gutierrezia microcephala
Gutierrezia sphaerocephala
small-head snakeweed, sticky snakeweed, threadleaf snakeweed
round-leaf snakeweed
glabrous or minutely hispidulous.
minutely, prominently, often sparsely, papillate-scabrous (hairs triangular or deltate to lanceolate, less than 0.1 mm).
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.
proximal usually absent at flowering;
cauline blades 1-nerved, linear, 0.5–1.2 mm wide, little reduced distally.
cylindric, 1–1.5 mm diam.
campanulate, 2.5–5 mm diam.
1(–2; each enclosed by conduplicate inner phyllary);
corollas yellow, (1.5–)2–3.5 mm.
10–15;
corollas yellow, 3–5.5 mm.
1, sometimes 2 (functionally staminate; corollas broadly obdeltate-funnelform, throats widely flaring, lobes 1/3 corolla lengths, recurved-coiling).
18–37.
(2–6, sessile to subsessile, in compact glomerules) in flat-topped arrays.
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.
0.9–1.2(–1.4) mm, faces without oil cavities, densely strigoso-sericeous in rows (hairs appressed to spreading, apices clavate);
pappi of 1 series of narrowly triangular or narrowly oblong scales 0.2–1 mm (distinct or basally connate 1/4–3/4 their lengths, usually shorter in rays).
apices flat.
apices flat.
= 8, 16, 24, 32.
= 8 (10).
Gutierrezia microcephala
Gutierrezia sphaerocephala
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.)
CA
SW CO Wildflowers
WildflowerSearch
iNaturalist
USDA Plants Database
