Jones: Flora of Illinois, 52. Amaranthaceae 121 



4. CoRiSPERMUM L. Bugseed 

 C. nitidum Kit. Sandy soil, local. July-Sept. 



5. Atriplex L. 

 1. Leaves lanceolate; bracts rhombic, cuneate at base; waste ground; nat. from 



Eur. July-Aug ^. patula L. 



1. Leaves hastate; bracts ovate, rounded at base; waste ground; nat. from Eur. 



Aug. -Oct ^- hastata L. 



6. Salsola L. — Saltwort 

 S. pestijer A. Nels. Sandy soil, local; nat. from Asia. July-Sept. [S. kali 

 var. tenuijolia G. F. W. Mey.} 



52. Amaranthaceae J. St. Hil. — Amaranth Family 



1. Leaves alternate; filaments separate and distinct; anthers 2-loculed. 



2. Flowers monoecious or polygamous; both staminate and pistillate flowers with 3-5 



sepals; fruit thin, dry, dehiscent 1. Amaranthus 



2. Flowers dioecious; pistillate flowers without a calyx; staminate flowers with 5 

 conspicuous mucronate sepals longer than the bracts; fruit fleshy, 3-5-angled, 



indehiscent — 2. Acnida 



1. Leaves opposite; plants pubescent; flowers perfect; calyx 5-cleft; filaments united 

 in a tube; anthers 1-loculed 3. Froelichia 



1. Amaranthus L. — Amaranth 

 1. Flowers in dense terminal and axillary panicles; plants tall, erect. 



2. Leaves with a pair of rigid axillary spines; waste ground, common; nat. 



from trop. Am. July-Oct. Spiny Amaranth A. spinosus L. 



2. Leaves without spines. 



3. Spikes stout, 1-1.5 cm. thick; stem pubescent; common weed in fields 

 and waste ground; nat. from trop. Am. Aug.-Sept. Rough Pigweed 



A. retroflexus L. 



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



4. Bracts deltoid-lanceolate, half the length of the .sepals; river banks, 



rare A. ambigens Standi. 



4. Bracts subulate, twice the length of the sepals; weed in waste 



ground; nat. from trop. Am. Sept.-Oct A. hybridus L. 



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

 5. Stems prostrate or ascending, forming a loose mat; upper leaves scarcely 

 reduced; sepals 4-5; utricle smooth or nearly so when dry; seeds about 

 1 mm. in diameter; fields and roadsides, common. July-Sept. Prostrate 



Amaranth A . blitoides Wats. 



5. Stems erect, forming round, bushy-branched tumbleweeds in late summer; 

 upper leaves much reduced; sepals 3; utricle rugose when dry; seeds 

 about 0.5 mm. in diameter; waste ground and fields, common. July- 

 Sept. Tumbleweed A. graecizans L. 



2. Acnida L. — Water-hemp 



l.Stem erect, 1-3 m. tall; leaves lanceolate or ovate-lanceolate. 

 2. Leaves obtuse or notched at the apex; pistillate inflorescence of slender in- 

 terrupted spikes; fruit circumscissile; sandy soil. July-Sept 



A. tamariscina (Nutt.) Wood 



