254 AMARANTHACEAE 



lanceolate, spinulose-cuspidate, more or less scarious-margined ; sepals of the 

 pistillate plants obovate-spatulate, rounded at the apex. Sandy soil: la. Tex. 

 Calif. Nev. Plain -Son. Jl-Au. 



3. A. Palmeri S. Wats. Stem erect, 6-10 dm. high, branching; leaves long- 

 petioled; blades rhombic-lanceolate or obovate, 2-5 cm. long, strongly veined 

 beneath; sepals of the staminate flowers lanceolate, spinulose-cuspidate, those 

 of the pistillate flowers 2-3 mm. long, oblong or somewhat spatulate, distinct or 

 nearly so. Banks and river valleys: Kans. Tex. Colo. Calif.; n Mex. 

 Son. Submont. 



4. A. Powellii S. Wats. Stem 3-15 dm. high, glabrous, simple or with 

 erect branches; leaves slender-petioled ; blades lanceolate or ovate, 3-10 cm. 

 long; bracts subulate, spinulose-cuspidate, 3 mm. long; sepals 1-2 mm. long, 

 lanceolate, mucronate. Loose or sandy soil: N.M. Wyo. Ore. 'Calif.; n 

 Mex. Son. Mont. Jl-S. 



5. A. Wrightii S. Wats. Stem 2-10 dm. high, simple or branched at the 

 base: leaves slender-petioled; blades lance-elliptic to rhombic-ovate, 1.2-6 cm. 

 long, yellowish green, paler beneath; bracts linear-lanceolate or subulate, longer 

 than the sepals, pungent; sepals 1.5-2 mm. long, rounded or truncate and retuse 

 at the apex. Sandy soil: N.M. s Colo. Ariz. Son. 



6. A. retroflexus L. Stem erect or ascending, usually branched, 3-30 dm. 

 high; leaves petioled; leaf -blades ovate or rhombic-ovate to lanceolate, 5-15 cm. 

 long; bracts subulate, twice as long as the oblong, scarious sepals. PIGWEED. 

 Waste places and fields: Vt. Fla. Calif. B.C.; Mex.; nat. from Eu. Plain 

 Submont. Je-O. 



7. A. hybridus L. Stem branched, 6-25 dm. high; leaves petioled; leaf- 

 blades ova-te, 4-10 cm. long, darker green above, scabrous-puberulent; bracts 

 subulate, twice as long as the oblong acute sepals. Waste places: R.I. Fla. 

 Colo. Calif. Alta.; Mex.; W. Ind.; nat. from Eu. Plain Son. Mr-S. 



8. A. blitoides S. Wats. Stem 3- 10 dm. long, glabrous or nearly so, pro- 

 fusely branched; leaf -blades broadly spatulate, obovate or oblanceolate, 1-3 cm. 

 long; bracts short-acuminate, 2-3 mm. long; sepals obtuse and mucronate or 

 acute; utricle not rugose. Dry ground, roadsides, and waste places: Minn. 

 La. Calif. B.C.; Mex.; adv. eastward to Me. and N. J. L. Son. Plain 

 Mont. Jl-S. 



9. A. graecizans L. Stems bushy-branched, whitish, 2-6 dm. high; leaf- 

 blades oblong or spatulate, 1-4 cm. long, papillose, mucronate-cuspidate; flowers 

 polygamous; sepals membranous. A. albus L. TUMBLE WEED. Waste places 

 and cultivated ground: R.I. Fla. Calif. B.C.; W. Ind.; Mex.; and Old World. 

 Plain -Submont. Jl-S. 



10. A. pubescens (Uline & Bray) Rydb. Stem spreading, pubescent with 

 a viscid pubescence; leaf -blades spatulate, 1-3 cm. long, very crisp, mucronate; 

 sepals thicker than in A. graecizans. Sandy places: N.M. Colo. Ariz. Son. 



11. A. californicus (Moq.) S. Wats. Stem prostrate, glabrous, branching 

 at the base, 2-5 dm. long; leaf -blades obovate or oblong, 5-20 mm. long, often 

 with white veins and margins; bracts lanceolate, membranous, acuminate; 

 sepals of the staminate flowers 1.5 mm. long, the single one of the pistillate 

 flowers shorter, lateral; utricle rugose. A. carneus Greene. Cultivated or 

 loose ground: Calif. Nev. Alta. Wash. Jl-S. 



2. ACNIDA L. WATER-HEMP. 



Annual coarse herbs, with branching stem and alternate, narrow, entire, 

 pinnately veined leaves. Flowers dioecious, subtended by 1-3 bracts, in ter- 

 minal or axillary, continuous or interrupted spikes. Staminate flowers with 5 

 scarious mucronate sepals. Stamens 5; filaments distinct, subulate; anthers 

 2-celled. Pistillate flowers without calyx. Ovary 1-celled; stigmas 2-5, papil- 

 lose or plumose. Ovules solitary. Utricle circumscissile or opening irregularly, 

 or indehiscent. Seeds smooth, erect, shining. 



