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chinchweed, manybristle chinchweed

Habit Annuals, 1–30 cm (often forming rounded bushes); herbage spicy-scented.
Stems

ascending, glabrous or puberulent.

Leaves

linear, 10–60 × 1–2 mm, margins with 1–3 pairs of setae, faces glabrous (dotted on margins with round to oval oil-glands 0.3–0.5 mm).

Peduncles

3–40 mm.

Heads

in congested or open, cymiform arrays.

Involucres

campanulate to cylindric.

Ray florets

(7–)8(–10);

corollas 3–8 mm.

Disc florets

6–34;

corollas 2–5.5 mm (weakly 2-lipped, glabrous or glandular-puberulent).

Phyllaries

distinct, linear, 3–8 × 0.5–1.7 mm (dotted with 1–5 subterminal oil-glands plus 2–5 pairs of submarginal oil-glands).

Cypselae

2–5.5 mm, strigillose to short-pilose (hair tips curled, bulbous);

ray pappi usually coroniform, rarely of 1+ awns or bristles 1–4 mm;

disc pappi usually of 16–24, subplumose bristles 1.5–4 mm, rarely coroniform.

Pectis papposa

Discussion

Varieties 2 (2 in the flora).

Pectis papposa generally flowers following summer monsoon rains in the desert of southwestern United States and northern Mexico. In favorable years, it becomes an aspect dominant, coloring wide areas of the desert with its bright yellow heads.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Distribution
from FNA
AZ; CA; NM; NV; TX; UT; nw Mexico
[WildflowerSearch map]
[BONAP county map]
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. longipes, P. prostrata, P. rusbyi, P. ×floridana
Subordinate taxa
P. papposa var. grandis, P. papposa var. papposa
Key
1.Phyllaries 3–5 mm; disc florets 6–14(–18); disc pappi 1–2.5 mmP. papposa var. papposa
1.Phyllaries 5–8 mm; disc florets 12–24(–34); disc pappi 2.5–4 mmP. papposa var. grandis
Name authority Harvey & A. Gray: Mem. Amer. Acad. Arts, n. s. 4: 62. (1849)
Source Flora of North America vol. 21, p. 227.
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