Machaeranthera tagetina — Details

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Overview

Distribution

Localities documented in Tropicos sources

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Machaeranthera tanacetifolia var. humilis A. Gray:
Mexico (Mesoamerica)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Localities documented in Tropicos sources

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Machaeranthera tagetina Greene:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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National Distribution

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United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

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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

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

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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

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United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

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Rounded Global Status Rank: G5 - Secure

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Notes

Comments

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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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