Ambrosia grayi — Details

Franseria tomentosa A. Gray:
United States (North America)

Fernald, M. 1950. Manual (ed. 8) i–lxiv, 1–1632. American Book Co., New York. http://www.tropicos.org/Reference/1327

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Ambrosia grayi (A. Nelson) Shinners:
United States (North America)

Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville. http://www.tropicos.org/Reference/1103
Rolfsmeier, S. B., R. B. Kaul & D. M. Sutherland. 1987. New and corrected records of the Flora of Nebraska. Trans. Nebraska Acad. Sci. 15: 49–52. http://www.tropicos.org/Reference/45685
Correll, D. S. & M. C. Johnston. 1970. Man. Vasc. Pl. Texas i–xv, 1–1881. The University of Texas at Dallas, Richardson. http://www.tropicos.org/Reference/1493
Great Plains Flora Association. 1986. Fl. Great Plains i–vii, 1–1392. University Press of Kansas, Lawrence. http://www.tropicos.org/Reference/637

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National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Perennials, 10–30+ cm. Stems erect. Leaves mostly alternate; petioles 10–45+ mm; blades elliptic to ovate, 45–60(–100+) × 30–45(–75+) mm, usually 1–2-pinnately lobed (lobes ± lanceolate), bases cuneate, ultimate margins serrate, abaxial faces densely sericeous or strigillose (silver or grayish), adaxial faces strigillose. Pistillate heads clustered, proximal to staminates; florets (1–)2. Staminate heads: peduncles 1–2 mm; involucres saucer-shaped, 3.5–5+ mm diam., strigillose; florets 8–25(–40+). Burs: bodies ± pyriform to globose, 3–5+ mm, stipitate-glandular, spines 8–12+, scattered, stoutly conic, 0.5–1+ mm, tips straight. 2n = 36.

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Diagnostic Description

Synonym

Gaertneria grayi A. Nelson, Bot. Gaz. 34: 35. 1902, based on Franseria tomentosa A. Gray, Mem. Amer. Acad. Arts, n. s. 4: 80. 1849, not Ambrosia tomentosa Nuttall 1818

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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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