Annuals, 7–15 cm (taprooted). Stems strigose. Leaves usually opposite proximally, sometimes alternate (distal); blades lance-linear to linear, 10–160 × 1.5–8(–12) mm, margins ciliate to 1/4 their lengths, hairs mostly less than 0.5 mm, faces strigose to strigillose (hair bases narrowly tuberculate), abaxial often gland-dotted. Heads 6–25+. Peduncles 0.2–0.5(–2) cm, lengths 1/20–1/2 times leafy portions of stems. Involucres 6–14 mm diam. Phyllaries 3–6 mm. Paleae oblong, 4–4.5 mm, acute to cuspidate. Ray florets 12–14; laminae ± elliptic, 5–17 mm (glabrous or puberulent). Disc florets 50+; corollas 2.5–4 mm. Cypselae black or mottled, 1.8–2 mm.

Distribution

• Generated Map
• Legacy Map

sw United States, Mexico.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Lower Taxa

Heliomeris longifolia var. annua, Heliomeris longifolia var. longifolia

Key

1	Stems branching mostly in distal 1/2, bases usually 7+ mm diam.; leaves (40–)80–160 × 4–8(–12) mm; involucres 9–14 mm diam	Heliomeris longifolia var. longifolia
1	Stems branching ± throughout, bases usually less than 5 mm diam.; leaves 10–70(–85) × 1.5–5 mm; involucres 6–9 mm diam. 3b. Heliomeris longifolia var. annua	> 1