Pectis longipes
Pectis humifusa
longstalk chinchweed, longstalk cinchweed, mat cinchweed
yerba de San Juan
ascending to erect (very leafy), glabrous.
prostrate (mat-forming, densely leafy), puberulent (in decurrent lines).
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).
oblong-oblanceolate to obovate, 3–17 × 1.5–4 mm wide, margins with 2–6 pairs of setae 1–2 mm, faces glabrous (dotted with scattered, round oil-glands 0.1–0.2 mm).
(30–)50–160 mm.
1–12 mm.
campanulate.
campanulate.
(8–)13(–15);
corollas 8–12 mm.
5;
corollas 3.5–5 mm.
25–50;
corollas 4–6 mm (2-lipped).
12–21;
corollas 2.5–3.5 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).
distinct, obovate, 4.5–6 × 2–4 mm (faces densely dotted with scattered, circular oil-glands 0.05–0.2 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.
2.5–4 mm, mostly puberulent (ray cypselae abaxially glabrous);
ray pappi of 2–3 slender, aristate scales 1.5–2.5 mm plus 2–10 lacerate scales or bristles;
disc pappi of 4–15, antrorsely scabrid bristles or aristate scales 2–3 mm plus 0–15 bristles or scales.
= 24, 48.
= 72.
Pectis longipes
Pectis humifusa
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 humifusa has been reported once from Florida (D. J. Keil 1975c), where it is probably adventive. In the Lesser Antilles, it occurs most frequently in the salt spray zone near the seashore; on some islands, it occurs inland as well.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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