Overview

Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Annuals, 5–50 cm. Leaves 5–40 × 3–17 mm. Involucres broadly turbinate, 5–10 mm. Phyllaries 24–44 in 3–5 series, lanceolate to linear-lanceolate, 4–9 × 0.7–1.5 mm, apices usually appressed, sometimes spreading, acute to acuminate. Receptacles convex, 2–3.5 mm diam. Ray florets 8–16; laminae 6–15 × 1–3 mm. Disc florets 14–40(–45); corollas 4–7 mm, glabrous or glabrate; lobes 0.7–1 mm, hairy (hairs multicellular), 0.2–0.5 mm. Cypselae 2–3.5(–4) mm; pappi 2–8 mm. 2n = 8.
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Diagnostic Description

Synonym

Aster tagetinus (Greene) S. F. Blake; Machaeranthera humilis (A. Gray) Standley; M. tanacetifolia Kunth var. humilis A. Gray
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Type Information

Holotype for Machaeranthera tagetina Greene
Catalog Number: US 212799
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): T. E. Wilcox
Year Collected: 1891
Locality: Fort Huachuca., Arizona, United States, North America
  • Holotype: Greene, E. L. 1899. Pittonia. 4: 71.
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Notes

Comments

In the flora area, Machaeranthera tagetina occurs in southern and central Arizona and southwestern New Mexico, in the Chihuahuan and Sonoran desert regions. Much of its range in those states overlaps with that of M. tanacetifolia. In southern and central Arizona, the two species occasionally hybridize.
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