Pectis longipes
Pectis cylindrica
longstalk chinchweed, longstalk cinchweed, mat cinchweed
Sonoran chinchweed, Sonoran cinchweed, Sonoran lemonweed, three-ray chinchweed
ascending to erect (very leafy), glabrous.
prostrate to ascending (often mat-forming, densely leafy distally), puberulent (in decurrent lines or throughout) or glabrate.
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).
(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).
(30–)50–160 mm.
1–5 mm.
campanulate.
cylindric.
(8–)13(–15);
corollas 8–12 mm.
3(–4);
corollas 3–4 mm (scarcely surpassing phyllaries).
25–50;
corollas 4–6 mm (2-lipped).
(3–)7–14;
corollas 2.2–2.6 mm (2-lipped).
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).
coherent (falling together), oblong to oblong-obovate, 6–10 × 2–3 mm (dotted with scattered, elliptic oil-glands 0.05–0.15 mm).
borne singly.
borne singly or in congested, (leafy) cymiform arrays.
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.
4–5.5 mm, puberulent (distally glandular-puberulent);
pappi of 2 (ray) and 5 (disc) lanceolate scales 1.5–3.5 mm.
= 24, 48.
= 48.
Pectis longipes
Pectis cylindrica
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.)
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.)
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