Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Eudicots: Core Eudicots: Caryophyllales
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JK Marlow jkm130128_172
January Spartanburg County SC
Stems with paired nodal spines, per Weakley's Flora.
Richard and Teresa Ware rtw_amaranthus_spinosus
Simple or compound terminal staminate spikes, usually green to silvery green, per Flora of North America.
JK Marlow jkm130928_680
September Spartanburg County SC
Plant freely branched, robust, 5dm or more tall, per Vascular Flora of the Carolinas.