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Sonoran chinchweed, Sonoran cinchweed, Sonoran lemonweed, three-ray chinchweed

Habit Annuals, 1–20 cm (across or high); herbage not scented.
Stems

prostrate to ascending (often mat-forming, densely leafy distally), puberulent (in decurrent lines or throughout) or glabrate.

Leaves

(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).

Peduncles

1–5 mm.

Involucres

cylindric.

Ray florets

3(–4);

corollas 3–4 mm (scarcely surpassing phyllaries).

Disc florets

(3–)7–14;

corollas 2.2–2.6 mm (2-lipped).

Phyllaries

coherent (falling together), oblong to oblong-obovate, 6–10 × 2–3 mm (dotted with scattered, elliptic oil-glands 0.05–0.15 mm).

Heads

borne singly or in congested, (leafy) cymiform arrays.

Cypselae

4–5.5 mm, puberulent (distally glandular-puberulent);

pappi of 2 (ray) and 5 (disc) lanceolate scales 1.5–3.5 mm.

2n

= 48.

Pectis cylindrica

Phenology Flowering Jul–Nov.
Habitat Deserts, oak-juniper woodlands, grasslands, wash channels, mud flats, lawns, roadsides
Elevation 700–1500 m (2300–4900 ft)
Distribution
from FNA
AZ; NM; TX; Mexico (Baja California Sur, Chihuahua, Coahuila, Durango, Nuevo León, Sinaloa, Sonora)
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Discussion

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.)

Source FNA vol. 21, p. 225.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Pectidinae > Pectis
Sibling taxa
P. angustifolia, P. filipes, P. glaucescens, P. humifusa, P. imberbis, P. linearifolia, P. linifolia, P. longipes, P. papposa, P. prostrata, P. rusbyi, P. ×floridana
Synonyms P. prostrata var. cylindrica
Name authority (Fernald) Rydberg: in N. L. Britton et al., N. Amer. Fl. 34: 198. (1916)
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