Smooth Amaranth - Amaranthus hybridus
State Rank Reason (see State Rank above)
Native to parts of the western hemisphere, likely introduced into Montana. Seldom collected in the state.
Monoecious. Stems erect, 30–100 cm with glabrous or sparsely hairy foliage. Leaf blade lanceolate to ovate, 1–8 cm long, longer than petiole. Inflorescence green, dense, cylindric spikes in terminal and sometimes axillary panicles; bracts lanceolate, spine-tipped, 3–4 mm long. Flowers: sepals 5, lanceolate, 1.5–2 mm long with excurrent midveins; stamens 4 to 5. Utricle 1.5–2 mm long, shorter than sepals (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX