Pectis cylindrica
Sonoran chinchweed, Sonoran cinchweed, Sonoran lemonweed, three-ray chinchweed
prostrate to ascending (often mat-forming, densely leafy distally), puberulent (in decurrent lines or throughout) or glabrate.
(bluish green) linear to linear-oblanceolate or narrowly oblong, 10–30 × 1.5–4 mm, margins with 2–5 pairs of setae 1–2 mm, faces glabrous (abaxial densely dotted with scattered, circular oil-glands 0.05–0.2 mm).
1–5 mm.
cylindric.
3(–4);
corollas 3–4 mm (scarcely surpassing phyllaries).
(3–)7–14;
corollas 2.2–2.6 mm (2-lipped).
coherent (falling together), oblong to oblong-obovate, 6–10 × 2–3 mm (dotted with scattered, elliptic oil-glands 0.05–0.15 mm).
borne singly or in congested, (leafy) cymiform arrays.
4–5.5 mm, puberulent (distally glandular-puberulent);
pappi of 2 (ray) and 5 (disc) lanceolate scales 1.5–3.5 mm.
= 48.
Pectis cylindrica
Pectis cylindrica (2n = 48) is similar to P. prostrata (2n = 24); the two occasionally grow together (D. J. Keil 1975b). Some herbaria contain mixed collections of the two. No evidence is available of hybrids between the two.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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