832 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



3. Chenopodium humile Hook. Alkau elite. East entrance, in low alkaline 

 places. B. C. to Calif., Colo., and Nebr.— Plants much branched, often conspicuously 

 tinged with red; leaves mostly obovate or spatulate, 1 to 3 cm. long. 



4. Chenopodium capltatum (L.) Aschers. Strawberry blite. East slope at low 

 altitudes, rare and perhaps introduced. Widely distributed in N. Amer. and in 

 Eur. and Asia. (Blitum capitatum L.)— Plants pale green, glabrous, simple or 

 branched; leaves triangular to lanceolate, 3 to 6 cm. long, toothed; flower clusters 

 in fruit fleshy and bright red, suggesting strawberries. 



5. Chenopodium leptophyllum Nutt. Open slopes or low places at east entrance. 

 B. C. to Oreg., N. Mex., and Mo.; also on the Atlantic coast.— Plants erect, branched, 

 30 to 70 cm. high, white-mealy; leaves short-petioled, 1 to 5 cm. long, entire or with 

 a few teeth; flowers in panicled spikes. 



6. Chenopodium atrovirens Rydb. East entrance, on dry banks. Mont, to Nov.— 

 Plants erect, green, 20 to 50 cm. high; leaves rhombic-ovate, long-petioled, 1 to 3 cm. 

 long, toothed. 



7. Chenopodium album L. Lamb's-quarters. Frequent at low altitudes, in 

 waste or cultivated ground or on open or brushy slopes; often extending high up 

 along the trails. Native of Eur.; widely naturalized as a weed in N. Amer.— Plants 

 branched, 0.5 to 1 meter high, usually white-mealy, sometimes green; leaves 

 lanceolate to rhombic-ovate, 2 to 6 cm. long, coarsely toothed, slender-petioled. 



Some of the specimens are very green and might be referred to C. payanum 

 Reichenb., but that is probably only a form of C. album. 



8. Chenopodium hians Standi. Along trail at head of Lake McDonald. Mont, 

 to N. Mex.— Plants 20 to 60 cm. high, white-mealy; leaves oblong to rhombic-ovate, 

 1 to 3 cm. long, entire or toothed, short-petioled. 



27. AMAEANTHACEAE. Pigweed Family. 



1. AMARANTHITS L. 



Annuals; leaves alternate, entire; flowers very small, green, in panicled spikes or 

 in clusters in the axils of the leaves; sepals 3 to 5; petals none; flowers each with 

 3 spine-pointed bracts at the base; fruit small, 1-seeded, dry, inclosed in the calyx. 



Flowers in long dense spikes at the top of the plant 1. A. retroflexus. 



Flowers in small dense clusters in the axils of the leaves. 



Plants erect; bracts much longer than the sepals; seeds about 0.8 mm. broad. 



2. A. graecizans. 



Plants prostrate; bracts only slightly longer than the sepals; seeds about 1.5 mm. 



broad 3. A. blitoides. 



1. Amaranthus retroflexus L. Pigweed. A few plants along the railroad at 

 Belton; introduced. Widely distributed in the U. S. and southern Can.— Plants 

 erect, 0.3 to 1 meter high or often larger, somewhat hairy; leaves ovate, 3 to 10 cm. 

 long, slender-petioled, obtuse. 



2. Amaranthus graecizans L. Tumbleweed. Waste or cultivated ground, Belton 

 and east entrance; infrequent. Widely distributed in N. Amer. and Eur.— Plants 

 much branched, 20 to 60 cm. high, the stems pale; leaves mostly spatulate, 1 to 4 

 cm. long. 



3. Amaranthus blitoides S. Wats. Waste or cultivated ground, Belton and east 

 entrance; infrequent. B. C. to Calif., Tex., and Minn.— Stems stout, glabrous or 

 nearly so, much branched, forming circular mats; leaves mostly spatulate, 1 to 3 

 cm. long. 



28. POKTULACACEAE. Purslane Family. 



Plants succulent, annual or perennial; leaves entire, opposite or alternate; sepals 

 2; petals 4 or 5 or sometimes more; stamens as many as the petals; fruit a small capsule. 



