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

Perennials, 20–80(–150+) cm. Stems erect. Leaves mostly alternate; petioles 10–35 mm; blades lanceolate to ovate, 40–85(–150) × 20–35(–55) mm overall, lacini­ately 2–4-pinnately lobed (lobes ± lanceolate); bases cuneate to truncate, ultimate margins entire, abaxial and adaxial faces strigillose to sericeous (often grayish) and gland-dotted. Pistillate heads clustered, proximal to staminates; florets 1(–2). Staminate heads: peduncles 0.5–2 mm; involucres cup-shaped, 1.5–3+ mm diam., strigillose; florets 5–20+. Burs: bodies pyramidal to pyriform, 1–2 mm, strigillose to pilosulous, spines (1–)5–12+, mostly distal, stoutly conic to subulate, 0.5–1 mm, tips uncinate. 2n = 72, 108.
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Diagnostic Description

Synonym

Franseria confertiflora (de Candolle) Rydberg
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Type Information

Isotype for Franseria caudata Rydb.
Catalog Number: US 350223
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): J. Skehan
Year Collected: 1898
Locality: Gray., Lincoln, New Mexico, United States, North America
  • Isotype: Rydberg, P. A. 1922. N. Amer. Fl. 33: 29.
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Isotype for Franseria pringlei Rydb.
Catalog Number: US 56848
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): C. G. Pringle
Year Collected: 1885
Locality: Jimulco., Chihuahua, Mexico, North America
  • Isotype: Rydberg, P. A. 1922. N. Amer. Fl. 33: 28.
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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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Wikipedia

Ambrosia confertiflora

Ambrosia confertiflora is a species of ragweed known by the common name weakleaf bur ragweed.

It is native to much of northern Mexico and the southwestern United States as far east as Kansas and Oklahoma. It is a perennial herb reaching heights between 30 centimeters and nearly two meters with bristly, fuzzy green to brown erect stems. The multilobed fuzzy leaves have blades which can be nearly 16 centimeters long and are borne on petioles with lobed, winglike appendages. As in other ragweeds, the inflorescence has staminate (male) and pistillate (female) flower heads. The pistillate heads yield one or two fruits which are burrs up to half a centimeter long and covered in short spines.

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