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Ambrosia grayi
Ambrosia grayi
(A. Nels.) Shinners
Family:
Asteraceae
Woolly-Leaf Burr-Ragweed,
more...
woollyleaf bur ragweed
[
Gaertnera tomentosa
,
more
Gaertneria grayi
A.Nelson
]
Steve Hurst
FNA
Resources
John L. Strother in Flora of North America (vol. 21)
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.
2
n
= 36.
Flowering Aug-Sep. Wet or seasonally wet flats, depressions, alkaline, clay soils, prairies; 600-1200 m; Colo., Kans., Nebr., Okla., Tex.
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