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Digital Herbaria

Amaranthus spinosus

Amaranthus spinosus L.

Spiny Amaranth, Thorny Pigweed

Amaranthaceae (Amaranth Family)

USDA Native Status: L48 (N), HI (I), PR (N), VI (N), CAN (I)

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Specimen & Label Data

Amaranthus spinosus

Spiney Pigweed


Location: Fenceline W of walking path adjacent to the horse pens--Oakwell Farms, San Antonio.
Latitude: 0.000000

Habitat: Level, open, dry, alluvial soil. Common, in large colonies.

Description: Erect, stout, 90 cm tall annual from stout 15 cm, white taproot. Few branched low, and many small in upper half. Most nodes w/pair of divergent spines. Leaves alternate,ovate-lanceolate, glabrous, w/mucronate tip, 1.5x7 cm, cuneate to a long petiole. Monoecious. Terminal spikes mostly staminate. Basal clusters of spikes and axillary clusters pistillate.

County: Bexar
Collector: Harry Cliffe
Collection Date: Sep 13, 1992
Specimen number: 489

Herbarium Owner: NPSOT
Herbarium ID: 0731
Accession Date: Apr 26, 1994
Accession Number: 53

Annotations: MCFRB Monoecious (In flower & fruit)

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