Pectis papposa
Pectis cylindrica
chinchweed, common chinchweed, manybristle chinchweed
Sonoran chinchweed, Sonoran cinchweed, Sonoran lemonweed, three-ray chinchweed
ascending, glabrous or puberulent.
prostrate to ascending (often mat-forming, densely leafy distally), puberulent (in decurrent lines or throughout) or glabrate.
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).
(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).
3–40 mm.
1–5 mm.
campanulate to cylindric.
cylindric.
(7–)8(–10);
corollas 3–8 mm.
3(–4);
corollas 3–4 mm (scarcely surpassing phyllaries).
6–34;
corollas 2–5.5 mm (weakly 2-lipped, glabrous or glandular-puberulent).
(3–)7–14;
corollas 2.2–2.6 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), oblong to oblong-obovate, 6–10 × 2–3 mm (dotted with scattered, elliptic oil-glands 0.05–0.15 mm).
in congested or open, cymiform arrays.
borne singly or in congested, (leafy) 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.
4–5.5 mm, puberulent (distally glandular-puberulent);
pappi of 2 (ray) and 5 (disc) lanceolate scales 1.5–3.5 mm.
= 48.
Pectis papposa
Pectis cylindrica
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 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.)
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
