Flora of North America species comparison

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Pectis longipes

longstalk chinchweed, longstalk cinchweed, mat cinchweed
Habit Perennials, 8–25 cm (rhizomes branched, 1–10 mm diam.); herbage lemon-scented or spicy-scented.
Stems

ascending to erect (very leafy), glabrous.
Leaves

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).
Peduncles

(30–)50–160 mm.
Involucres

campanulate.
Ray florets

(8–)13(–15);

corollas 8–12 mm.
Disc florets

25–50;

corollas 4–6 mm (2-lipped).
Phyllaries

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).
Heads

borne singly.
Cypselae

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.
2n

= 24, 48.

Pectis longipes
Phenology Flowering Apr–Nov.
Habitat Grasslands, oak-juniper-mesquite woodlands
Elevation 900–1700 m (3000–5600 ft)
Distribution
from FNA
AZ; NM; Mexico (Chihuahua, Durango, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

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.)
Source FNA vol. 21, p. 226.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Pectidinae > Pectis
Sibling taxa
P. angustifolia, P. cylindrica, P. filipes, P. glaucescens, P. humifusa, P. imberbis, P. linearifolia, P. linifolia, P. papposa, P. prostrata, P. rusbyi, P. ×floridana
Name authority A. Gray: Smithsonian Contr. Knowl. 5(6): 69. (1853)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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