Difference between revisions of "Ambrosia grayi"
Field & Lab. 17: 174. 1949.
Basionym: Gaertneria grayi A. Nelson Bot. Gaz. 34: 35. 1902,
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ambrosiinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Ambrosiinae | ||
Revision as of 21:35, 16 December 2019
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.
Phenology: Flowering Aug–Sep.
Habitat: Wet or seasonally wet flats, depressions, alkaline, clay soils, prairies
Elevation: 600–1200 m
Distribution
Colo., Kans., Nebr., Okla., Tex.
Discussion
Selected References
None.
Lower Taxa
None.