90 American Midland Naturalist Monograph No. 7 



3. Lower leaves hastate; bracts truncate at base; waste ground; 



nat. from Eur. Aug.-Oct A. hastata L. 



2. Bracts oval, conspicuously net-veined; waste ground; nat. from 



Asia; Du Page, Lake, and VeiTnilion counties A. hortensis L. 



1. Bracts enclosing the fruit hard and bony. 



4. Bracts ovate, acute, longer than broad; stem terete or nearly so; 

 leaves oval to ovate; waste ground, occasional; native of 

 Eurasia A. rosea L. 



4. Bracts suborbicular, as broad as long; stem angular; leaves 

 triangular-ovate to deltoid; waste ground, adv. from the 

 western states. Silverscale A. argentca Nutt. 



6. Salsola L. — Saltwort 



S. pestijer A. Nels. Russian-thistle. Sandy soil, chiefly in the n. 

 half of 111.; nat. from Asia. July-Sept. [S. kali var. tenuifolia Tausch.]. 



7. Salicornia L. — Glasswort 



S. europaca L. Muddy banks, Harvey, Cook Co., Sept. 2, 1948, 

 G. S. Winter ringer 1588, 1599. 



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



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



2. Both staminate and pistillate flowers with 3-5 sepals 1. Amaranthus 



2. Pistillate flowers without a calyx; staminate flowers with 5 conspicuous 



mucronate sepals longer than the bracts 2. Acnida 



1. Leaves opposite; anthers 1-loculed. 



3. Flowers in axillary glomerules; pistillate calyx not woolly 3. Tidestromia 



3. Flowers in terminal spikes or panicles; at least the pistillate calyx woolly. 



4. Flowers perfect, in dense spikes on long peduncles; plants woolly- 

 pubescent; filaments united into a tube 4. Froelichia 



4. Flowers unisexual, paniculate; plants glabrous or nearly so; filaments 



united at base 5. Iresine 



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, com- 

 mon; nat. from trop. Am. June-Oct. Spiny Pigweed 



A. spinosus L. 



2. Leaves without spines; utricle circumscissile. 



3. Plants monoecious; both staminate and pistillate flowers in 

 the same or diff'erent spikes. 

 4. Sepals of the pistillate flowers about 1.5 mm long. 



5. Panicle purple; bracts merely awn-pointed, shorter than 

 or equalling the obtuse sepals; utricle longer than the 

 calyx; occasionally escaped from gardens; native of 

 China; Cook Co., Moffatt A. cruentus L. 



