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CHENOPODIACEAE. 
Sepals very fleshy, one or two decidedly carinate; leaves broadest near the base. 
Plant depressed, spreading. 3. D. depressa. 
Plant erect. 4. D. erecta. 
1. Dondia Moquini (Torr.) A. Nels. ( Chenopodium Moquini Torr.; 
Swaeda Torreyana S. Wats.) In salt marshes from Wyo. to Nev., Colo, and 
Lower Calif.—Canon City; Hotchkiss. 
2. Dondia diffusa (S. Wats.) Heller. ( Swaeda diffusa S. Wats.) In salt 
marshes from Nebr. to Nev. and Colo.—Alt. 4000-6000 ft.—Salida; Grand 
Junction; Mancos; Canon City; Delta; Pueblo. 
3. Dondia depressa (Pursh) Britton. ( Salsola depressa Pursh; Swaeda 
depressa S. Wats.) In salt marshes from Sask. to Mont., Colo, and Nev.— 
Alt. up to 8000 ft.—Buena Vista; river bottom land, Fort Collins; Delta. 
4. Dondia erecta (S. Wats.) A. Nels. ( Swaeda depressa erecta S. Wats.) 
In salt marshes from N. D. to Mont., Colo, and Nev.—Alt. 4000-9000 ft.— 
Grand Junction; Lake John, North Park; Fort Collins; Pueblo; along Pou- 
dre River. 
14. SALSOLA L. Russian Thistle, Salt-wort. 
1. Salsola Tragus L. In waste places and old fields; introduced from Eu¬ 
rope and naturalized from Ont. to Wash., Mo. and Colo.—Alt. 4000-7000 ft.— 
Near Boulder; Pueblo; Denver; Huerfano Valley; Canon City; Walsenburg; 
La Salle. 
Family 46. AMARANTHACEAE J. St. Hil. Amaranth Family. 
Anthers 2-celled; green plants with alternate leaves. 
Perianth present in all flowers. 1. Amaranthus. 
Perianth wanting in the pistillate flowers. 2. Acnida. 
Anthers i-celled; stellate or woolly plants with mainly opposite leaves. 
Filaments united into a short cup at the base; calyx neither crested nor spiny; 
plants stellate, diffuse. 3. Cladotrix. 
Filaments united into a long tube; calyx crested and tubercled or spiny at 
maturity; plants woolly, erect. 4. Froelichia. 
1. AMARANTHUS L. Amaranth, Pigweed. 
Sepals clawed; flowers in terminal and axillary spikes. 
Bracts lanceolate, shorter than the flowers. 1. A. Torreyi. 
Bracts subulate, longer than the flowers. 2. A. Palmeri. 
Sepals not clawed. 
Plants tall, simple ; flowers in terminal and axillary spikes. 
Stamens 3 ; sepals 1-2 mm. long. 3. A. Powellii. 
Stamens 5 ; sepals 2-3 mm. long. 
Spikes stout, 8-14 mm. thick, strict; stem usually more or less pubescent. 
4. A. retroflexus. 
Spikes slender, 4-6 mm. thick, usually drooping; stem glabrous. 
5. A. hybridus. 
Plant low, much branched; flowers in small axillary spikes, shorter than the 
leaves. 
Sepals 4-5 ; bracts lanceolate-subulate, a little longer than the sepals ; plant 
prostrate. 6. A. blitoides. 
Sepals 3 ; bracts much longer than the sepals, pungent; plant erect, glabrous. 
7. A. graecizens. 
