Pectis longipes
Pectis imberbis
longstalk chinchweed, longstalk cinchweed, mat cinchweed
beardless chinchweed, tall chinchweed
ascending to erect (very leafy), glabrous.
erect, glabrous.
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).
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).
(30–)50–160 mm.
10–80 mm.
campanulate.
cylindric.
(8–)13(–15);
corollas 8–12 mm.
5;
corollas 6–11 mm (laminae often dotted near margins with inconspicuous oil-glands).
25–50;
corollas 4–6 mm (2-lipped).
4–7;
corollas 3.7–6 mm (lobes 5, equal, each with 1 subterminal oil-gland).
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).
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.
borne singly or in open, 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.
3.5–5 mm, puberulent (hair tips blunt);
pappi of 1–3 stout awns 1–2 mm or coroniform.
= 24, 48.
= 24.
Pectis longipes
Pectis imberbis
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 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.)
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