28. Amaranthaceae 91 



5. Panicle green; bracts long-awned, about twice the length 



of the acute sepals; utricle shorter than to about equal- 

 ling the calyx; common weed in waste ground and 



fields. Aug. -Oct A. hybridus L. 



4. Sepals of the pistillate flowers 2-3 nun long. 



6. Terminal panicle lobulate; sepals of the pistillate flowers 



obtuse, mucronulate; stamens 5; stem pilosulous, at 

 least above; common weed in fields and waste ground. 



Aug.-Sept. Rough Pigweed A. retroflexus L. 



6. Panicle of few erect stiff" spikes 5-25 cm long; sepals of 

 the pistillate flowers acute or acuminate; stamens 

 usually 3; stem glabrous or puberulent; waste ground; 



adv. from the western states. Aug.-Sept 



A. powcllii S.Wats. 



3. Plants dioecious, ihe flowers all staminate or all pistillate; 

 sepals of the pistillate flowers spatulate, clawed at base, 

 2.5-3 mm long; inflorescence of long slender, dense or 

 interrupted tenninal spikes; waste places, occasional; adv. 



from the western states A. arenicola I.M.Johnston 



1. Flowers in small axillary clusters; plants diffusely branched or 

 prostrate. 

 7. Stems prostrate; seeds 1.5 mm in diameter; fields and roadsides, 

 common. June-Oct. Prostrate Amaranth. [A. blitoides 



Wats.] A. graecizans L. 



7. Stems erect or ascending; seeds 1 mm in diameter; waste ground 

 and fields, common. July-Sept. Tumbleweed A. albus L. 



2. Acnida L. — Water-hemp 

 1. Utricle circumscissile; stem erect; fields, roadsides, and waste 



places, local; probably adv. from the West. July-Sept 



A. tamariscina (Nutt.) Wood 



1. Utricle indehiscent or bursting irregularly. 



2. Stem tall (0.5-2 m), erect; banks of streams, muddy shores, 

 dried sloughs, sand bars, moist ground in woods, locally 



throughout 111. July-Oct. Tall Water-hemp 



A. altissima Riddell 



2. Stem decumbent or ascending, 15-60 cm long; banks of streams, 

 and mud flats, local. Aug.-Oct A. subnuda (Wats.) Standi. 



3. Tidestromia Standi. 

 T. lanuginosa (Nutt.) Standi. Ad\-. from the western states. Cook 

 Co., Mo fja}t in 1893. 



4. Froelichia Moench 

 1. Stem 60-100 cm tall, sparingly branched; wings of the fruiting 

 calyx continuous, dentate; sandy soil; chiefly in the northern 

 half of 111.; also Kankakee Co. June-Oct. [F. jloridana sensu 

 auth., non (Nutt.) Moq.] F. campestris Small 



