I'-'O CHENOPODIACEAE. 



Sepals very fleshy, one or two decidedly carinate ; leaves broadest near the base. 

 Plant depressed, spreading. 3. D. depressa. 



Plant ereet. 4. D. crecta. 



1. Dondia Moquini (Torr.) A. Nels. (Chenopodium Moquini Torr. ; 

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

 Lower Calif. — Canon City; Hotchkiss. 



2. Dondia diffusa (S. Wats.) Heller. (Szvacda diffusa S. Wats.) In salt 

 marshes from Ncbr. to Nev. and Colo. — Alt. 4000-6000 ft. — Salida; Grand 

 Junction; Mancos; Canon City; Delta; Pueblo. 



3. Dondia depressa (Pursh) Britton. {Salsola depressa Pursh ; Swacda 

 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-celIed ; green plants with alternate leaves. 



Perianth present in all flowers. i. 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, dift'use. 3. Cladotrix. 



Filaments united into a long tube ; calyx crested and tubercled or spiny at 



maturity ; plants wooll5% 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. Pozvellii. 



Stamens s ; sepals 2-3 mm. long. 



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



4. A. rctroflexus. 

 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. 



