Pectis papposa
Pectis longipes
chinchweed, common chinchweed, manybristle chinchweed
longstalk chinchweed, longstalk cinchweed, mat cinchweed
ascending, glabrous or puberulent.
ascending to erect (very leafy), 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 to linear-oblanceolate, 10–55 × 1–3 mm, margins with 1–4 pairs of setae, faces glabrous (conspicuously dotted on margins with round oil-glands 0.3–0.5 mm).
3–40 mm.
(30–)50–160 mm.
campanulate to cylindric.
campanulate.
(7–)8(–10);
corollas 3–8 mm.
(8–)13(–15);
corollas 8–12 mm.
6–34;
corollas 2–5.5 mm (weakly 2-lipped, glabrous or glandular-puberulent).
25–50;
corollas 4–6 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).
distinct, linear, linear-oblanceolate, or linear-elliptic, 5–8 × 0.7–2 mm (dotted with 1–3, swollen, subterminal oil-glands 0.3–0.4 mm plus 1–3 pairs of narrow, submarginal oil-glands).
in congested or open, cymiform arrays.
borne singly.
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.
2.5–4.5 mm, strigillose (hairs tips acute or blunt);
ray pappi of 1–2 awns 3–3.5 mm;
disc pappi of 2–30 unequal bristles 3–5 mm.
= 24, 48.
Pectis papposa
Pectis longipes
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 longipes has been listed from Texas in floras; I have seen no collections from that state.
Pectis longipes comprises two cytological races. Diploid, spicy-scented plants occur throughout the range. In southern Arizona, the diploid race is broadly sympatric but locally allopatric with a tetraploid, lemon-scented race. The tetraploid race is nested within the range of the diploids. The races are easily separable by odor, and although they are very similar morphologically, they can be separated also by statistically significant differences in floral dimensions and pollen size (M. A. Luckow 1983). Based upon those minute differences, the type collection is diploid. Because the races are so similar morphologically and because so many of the specimens of P. longipes in herbaria bear no indication of odor, I chose not to give the cytological races formal recognition.
(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
