Pectis ×floridana
Pectis imberbis
chinchweed
beardless chinchweed, tall chinchweed
decumbent to erect, glabrous.
erect, glabrous.
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).
narrowly linear, 10–50 × 1–2 mm (sometimes smaller, bractlike distally), margins with 0–1 pairs of setae, faces glabrous (abaxial dotted near each margin with a row of elliptic oil-glands ca. 0.3 mm).
5–25 mm.
10–80 mm.
cylindric to narrowly fusiform.
cylindric.
5;
corollas 3.5–4.2 mm.
5;
corollas 6–11 mm (laminae often dotted near margins with inconspicuous oil-glands).
4–6;
corollas 2.2–2.5 mm (2-lipped).
4–7;
corollas 3.7–6 mm (lobes 5, equal, each with 1 subterminal oil-gland).
coherent (falling together), linear or linear-oblanceolate, 5–7 × 1–2 mm (dotted with scattered, oval oil-glands 0.2–0.3 mm).
distinct, linear-oblong, 5–9.5 × 1–1.5 mm (each dotted with 1–2 swollen, subapical oil-glands and a row of 2–3 linear, submarginal oil-glands on each side of midrib).
borne singly or in condensed, cymiform arrays.
borne singly or in open, cymiform arrays.
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.
3.5–5 mm, puberulent (hair tips blunt);
pappi of 1–3 stout awns 1–2 mm or coroniform.
= 3x = 36.
= 24.
Pectis ×floridana
Pectis imberbis
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.)
Pectis imberbis occurs in relatively small, widely separated populations. Overgrazing may be a factor in the scarcity of these plants. They are generally more than 25 cm before they begin to flower and may be unable to reproduce under grazing pressure.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
WildflowerSearch
iNaturalist
USDA Plants Database
