78 CHENOPODIACEAE 



Seeds tubercled. 1- D- Torreyana. 



Seeds not tubercled. 2. D. intermedia. 



Plant annual, more slender. 3. D. nigra. 

 Sepals very fleshy, one or two decidedly carinate. 



Leaves subulate, broadest at the base; flowers crowded. 



Plant depressed, spreading. 4. D. depressa. 



Plant erect, strict. 5. D. erecta. 



Leaves narrowed at the base; spike slender; flowers not crowded. 6. D. occidentalis. 



Family 39. AMARANTHACEAE. Amahanth Family. 



Anthers 2-celled ; green plants with alternate leaves. 



Perianth present in all flowers. 1. Amahanthub. 



Perianth wanting in the pistillate flowers. 2. Acnida. 



Anthers 1-ceUed; stellate or woolly plants with mostly opposite leaves. 



Filaments united into a short cup at the base; calyx neither crested nor spiny; plants 

 stellate, diflluse. 3. Tidesthomia. 



Filaments united into a long tube; calyx crested and tuberculate or spiny at matur- 

 ity; plants woolly, erect. 4. Froeuchia. 



1. AMARANTHUS (Tourn.) L. Amaranth, Pigweed, Tumblewbed. 



Sepals clawed; flowers in terminal and axillary spikes. 



Monoecious; sepals fimbriate; utricle circumscissile; leaf -blades linear or linear- 

 lanceolate. 1. A. fimbriatus. - 

 Dioecious: sepals not fimbriate; utricle indehiscent; leaf-blades lanceolate-ovate or 

 obovate. 

 Bracts lanceolate, not exceeding the flowers; spike not very long. 



2. A. Torreyi. 

 Bracts subulate, pungent, exceeding the flowers; spikes very long. 



3. A. Palmeri. 

 Sepals not clawed. 



Plants tall, simple; flowers in terminal and axillary panicles; sepals 5. 



Stamens 3; sepals 1-2 mm. long; bracts 5 mm. long or more. 4. A. Powellii. 

 Stamens 5; sepals 2-3 mm. long; bracts 3-5 mm. long. 



Spikes stout, 8-14 mm. thick, strict; pistillate sepals obtuse or truncate. 



Inflorescence tinged with red; pistillate sepals 1.5-2 mm. long; plant 



glabrous. 5. A. Wrightti. 



Inflorescence pale green; pistillate sepals 3 mm. long; plant vfllous. 



6. A. retroflexus. 

 Spike slender, 4-6 mm. thick, usually drooping ; stem glabrous ; pistillate sepals 

 acute. 7. A. hybridus. 



Plant low, much branched; flowers in small axillary spike-like panicles, shorter than 

 the leaves. 

 Sepals 3-5, well developed. 



Sepals 4-5; bracts lanceolate, a Uttle longer than the sepals; plant prostrate. 



8. A. blitoides. 

 Sepals 3; bracts much longer than the sepals, pungent. 



Plant erect, glabrous. 9. A. graecizans. 



Plant prostrate or diffuse, pubescent. 10. A. pubescens. 



Sepals of the pistillate flowers, all except one, minute or wanting. 



11. A. californicus. 



2. ACNIDA L. Water-hemp. 



Pistillate inflorescence of slender interrupted spikes; fruit circumscissile. 1. A. tamariscina. 

 Pistillate inflorescence of closely clustered spikes ; fruit indehiscent or irregularly splitting. 



2. A. altissima. 



3. TIDESTROMIA Standi. l. T. lanuginosa. 



4. FROELfCHIA Moench. 



Stout, 4—12 dm. tall; crest of fruiting calyx continuous, dentate. 1. F. campestris. 



Slender, 2-5 dm. high; crest of fruiting calyx interrupted, forming distinct spines. 



2. F. gracilis. 



Family 40. NYCTAGINACEAE. Four-o'clock Family. 



Bracts distinct. 



Fruit crested or winged; bracts in a whorl at the base of the head-like cluster; peri- 

 anth saJverform. 

 Bracts conspicuous. 



Wings not completely encircling the fruit, interrupted above and below. 



1. Abronia. 

 Wings completely encircling the fruit. 2. Tripterocaltx. 



Bracts inconspicuous or lacking. 3. Seunocarpus. 



Fruit globular, neither crested nor winged; bracts attached each to a pedicel of the 

 umbel-like or corymbose inflorescence; perianth funnelform. 4. Hermidium. 

 Bracts united. 



Fruit neither strongly tubercled nor winged. 



