120 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 (Torn) A. Nels. (Chenopodium Moquini Torr. ; 

 Swacda Torrcyana S. Wats.) In salt marshes from Wyo. to Nev., Colo, and 

 Lower Calif. Canon City; Hotchkiss. 



2. Dondia diffusa (S. Wats.) Heller. (Swacda 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. (Swacda 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. 



i. 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. i. AMARANTH us. 



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. 



i. AMARANTHUS L. AMARANTH, PIGWEED. 



Sepals clawed ; flowers in terminal and axillary spikes. 



Bracts lanceolate, shorter than the flowers. i. 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. Poiveltii. 



Stamens 5 ; sepals 2-3 mm. long. 



Spikes stout, 8-14 mm. thick, strict; stem usually more or less pubescent. 



4. A. retrofle.rus. 

 Spikes slender, 4-6 mm. thick, usually drooping ; stem glabrous. 



5. A. hybridtis. 

 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. graccizcns. 



