Pectis papposa
Pectis ×floridana
chinchweed, common chinchweed, manybristle chinchweed
chinchweed
ascending, glabrous or puberulent.
decumbent to erect, glabrous.
linear, 10–60 × 1–2 mm, margins with 1–3 pairs of setae, faces glabrous (dotted on margins with round to oval oil-glands 0.3–0.5 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).
3–40 mm.
5–25 mm.
campanulate to cylindric.
cylindric to narrowly fusiform.
(7–)8(–10);
corollas 3–8 mm.
5;
corollas 3.5–4.2 mm.
6–34;
corollas 2–5.5 mm (weakly 2-lipped, glabrous or glandular-puberulent).
4–6;
corollas 2.2–2.5 mm (2-lipped).
distinct, linear, 3–8 × 0.5–1.7 mm (dotted with 1–5 subterminal oil-glands plus 2–5 pairs of 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).
in congested or open, cymiform arrays.
borne singly or in condensed, cymiform arrays.
2–5.5 mm, strigillose to short-pilose (hair tips curled, bulbous);
ray pappi usually coroniform, rarely of 1+ awns or bristles 1–4 mm;
disc pappi usually of 16–24, subplumose bristles 1.5–4 mm, rarely 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.
= 3x = 36.
Pectis papposa
Pectis ×floridana
Varieties 2 (2 in the flora).
Pectis papposa generally flowers following summer monsoon rains in the desert of southwestern United States and northern Mexico. In favorable years, it becomes an aspect dominant, coloring wide areas of the desert with its bright yellow heads.
(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.)
1. Phyllaries 3–5 mm; disc florets 6–14(–18); disc pappi 1–2.5 mm | var. papposa |
1. Phyllaries 5–8 mm; disc florets 12–24(–34); disc pappi 2.5–4 mm | var. grandis |
CalFlora
WildflowerSearch
iNaturalist
USDA Plants Database
