Pectis rusbyi
Pectis ×floridana
Rusby's chinchweed, Rusby's cinchweed
chinchweed
erect or ascending, glabrous or sparsely puberulent (in decurrent lines).
decumbent to erect, glabrous.
linear to narrowly elliptic, 10–50 × 1–5 mm, margins with 1–3 pairs of setae, faces glabrous or sparsely puberulent (dotted on margins with round oil-glands 0.2–0.7 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).
20–80 mm.
5–25 mm.
campanulate.
cylindric to narrowly fusiform.
8(–13);
corollas 5–11 mm.
5;
corollas 3.5–4.2 mm.
(7–)20–55;
corollas 3.5–5 mm (2-lipped).
4–6;
corollas 2.2–2.5 mm (2-lipped).
distinct, oblong or narrowly obovate, 4–7 × 1–2 mm (dotted with 0–2, subterminal oil-glands plus 2–4 pairs of inconspicuous, round to narrowly elliptic, submarginal oil-glands).
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 open, cymiform arrays.
borne singly or in condensed, cymiform arrays.
3–4.5 mm, strigillose or short-pilose;
ray pappi of 1–4, antrorsely barbed awns 1–4 mm or coroniform;
disc pappi of 15–30, antrorsely barbed bristles 2.5–5 mm or coroniform.
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.
= 24 (as P. palmeri).
= 3x = 36.
Pectis rusbyi
Pectis ×floridana
Pectis rusbyi is much less common in Arizona than P. papposa var. papposa, with which it sometimes grows.
(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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