Pectis cylindrica
Pectis ×floridana
Sonoran chinchweed, Sonoran cinchweed, Sonoran lemonweed, three-ray chinchweed
chinchweed
prostrate to ascending (often mat-forming, densely leafy distally), puberulent (in decurrent lines or throughout) or glabrate.
decumbent to erect, glabrous.
(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).
linear, 15–35 × 1–2 mm, margins with 3–5 pairs of setae, faces glabrous (abaxial densely dotted with round oil-glands ca. 0.2 mm).
1–5 mm.
5–25 mm.
cylindric.
cylindric to narrowly fusiform.
3(–4);
corollas 3–4 mm (scarcely surpassing phyllaries).
5;
corollas 3.5–4.2 mm.
(3–)7–14;
corollas 2.2–2.6 mm (2-lipped).
4–6;
corollas 2.2–2.5 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).
coherent (falling together), linear or linear-oblanceolate, 5–7 × 1–2 mm (dotted with scattered, oval oil-glands 0.2–0.3 mm).
borne singly or in congested, (leafy) cymiform arrays.
borne singly or in condensed, cymiform arrays.
4–5.5 mm, puberulent (distally glandular-puberulent);
pappi of 2 (ray) and 5 (disc) lanceolate scales 1.5–3.5 mm.
3–3.5 mm (pericarps darkening, not swelling, ovules abortive), strigillose to short-pilose;
pappi of 2 (ray) or 5 (disc) slender, antrorsely scabrid, aristate scales 2–2.5 mm, sometimes with additional shorter scales or bristles.
= 48.
= 3x = 36.
Pectis cylindrica
Pectis ×floridana
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.)
Pectis ×floridana is a triploid hybrid between P. glaucescens (2n = 48) and P. prostrata (2n = 24). The hybrids have been observed where the parental taxa grow together in roadside habitats in southern Florida. At the type locality, the hybrids were nearly as common as the parentals. Meiosis in the hybrids is very irregular; resulting pollen grains are malformed and variable in size and apparently all sterile. No fruits have been observed. Regeneration of the hybrids from season to season apparently requires new hybridization events.
The hybrids superficially resemble Pectis linearifolia from which they differ in having spicy-scented rather than lemon-scented herbage, longer peduncles, and strongly carinate phyllaries that cohere at the bases and fall together as a group.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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