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Montana Field Guide

Montana Field Guides

Russian Pigweed - Axyris amaranthoides

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 1

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General Description
Monoecious annual herb with sparse, stellate-pubescent foliage. Stems erect, branched, 40–100 cm. Leaves petiolate, the blades lanceolate, 2–8 cm long with entire margins. Inflorescence long-leafy bracteate panicles with spike-like branches. Flowers unisexual. Male flowers minute, 3-parted, in terminal spikes. Female flowers each subtended by 3 leaf-like bracts, below male flowers or in long-pedunculate panicles; calyx 3-parted, ca. 2 mm long, whitish. Fruit a flattened utricle, winged above, 2–3 mm long, surrounded by a slightly enlarged calyx (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
One collection from Sheridan County over 60 years ago; native to Eurasia, northern U.S. and adjacent parts of southern Canada (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX; Shultz 2003 in Fl. N. Amer. Vol. 4).

Habitat

References
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Citation for data on this website:
Russian Pigweed — Axyris amaranthoides.  Montana Field Guide.  .  Retrieved on , from