ORDER 107. AMAKAXTACEJE. 28 ( J 



spikes slenaer, acutish, crowded, all nearly equal, reddish-green, or in /3. nang-uineut^ 

 crimson ; bracts short-awned. Fields and gardens. 2 3f. Mexico. 



3 A. retrofKsxus L. Pubescent, erect, stout ; leaves ovate or subrhombic, obtuse- 



pointed ; panicle of thick, crowded, dense spikes; bracts awned, longer than calyx. 

 A common weed in gardens and fields. 2 4f. Plant green or glaucous. 



4 A. hybrid 11 8 L. Erect, glabrous, green ; leaves ovate, bright green ; panicle 



loose ; spikes terete, obtuse ; calyx shorter than the awned bracts. Mexico. 



5 A. albus L. White Pigweed. Whitish, diffusely spreading; leaves long-petioled, 



rhomb-ovate, very obtuse ; glomerules remote, in pairs, 4- or 5-flowered : common. 



6 A. luelaiichollcus. Lme-lien-bkeding. Erect, usually dark-purple ; leaves lance- 



oblong, obtuse, emarginate ; glomerules dark-purple. Asia. 2 4f. 

 ft. tricolor. Leaves variegated with purple, green, and yellow. 



7 A. spiiiosus L. Much branched; leaves rhomb-ovate, obtuse, with 2 spines in 



each axil ; spikes panicled, erect, acute ; bracts equalling the sepals ; utricle falling 

 without opening. Waysides, Penn. to Fla., and W. 



8 A. lividua Moq. Erect, smooth, livid-purplish; Ivs. elliptic, obtuse, emarginate ; 



spikes slender, rigid, acute ; sepals thrice longer than bracts; fruit rugous. 



9 A. deflexus L. Ascending, ashy-green, branches deflexed ; leaves rhomb-lanceo- 



late, obtuse ; spikes thick, obtuse ; sepals longer than bracts; fruit smooth. 



10 A. viridis L. Erect; livid-purple; leaves long-petioled, ovate ; spikes panicled, 

 rather loose and long ; sepals twice longer than the bracts. Waste grounds, S. 



11 A. piimiliis Raf. Diffuse or prostrate ; leaves subsessile, obovate ; flowers in ax- 

 illary, sessile glomerules ; fruit twice longer than the calyx. Sandy sea-coasts. 



3. ACNIDA, L. WATER HEMP. Fls. <$ $ , 3-bracted. <s Calyx of 5 

 equal, erect sepals. Stamens 5, anth. 2-celled. 2 Cal. 0. Ovary 1-ovuled, 

 with 3 5 stig. Utricle 1-seeded, naked. (D Glabrous, tall, branched, with 

 long-stalked, entire leaves and fls. small, green, in slender spikes. Jl. Oct. 



ACNIDA proper. Utricle indehiscent, longer than its stigmas No. 1 



$ MONTELIA. Utricle circumscissile, shorter than its stigmas No. 2 



1 A. caunabina L. Leaves lanceolate to linear, pointed, 28' ; t spikes numerous, 



rather dense, 2 4' ; 9 spikes interrupted ; panicle leafy ; fr. H', obovoid, bracts J as 

 long. Salt marshes. 3 Sf. The two sorts quite dissimilar. 



2 A. tamariscliia. Leaves lance-oval, 1 5' ; spikes interrupted and leafy at base, 



or throughout ; 9 bracts longer than the ovary. Wet shores, E. and W. 1 (if. The 

 t plant scarcely diners from $ No. 1. 



4. IRE SINE, Br. Fls. <$ $ or 5 , 3-bracted. Calyx of 5 erect sepals. 

 Sta. 5, anth. 1-celled. Stigmas 2 or 3. Utricle valveless, included in the 

 calyx. Leaves opposite, petiolate. Flowers minute, scarious, white, in 

 dense spikes or heads. September, October. 



I. celosioides L. Branches opposite, strict ; leaves ovate-lanceolate ; flowers in nu- 

 merous delicate panicled spikes. Banks, W. and S-W. 2 4f. 



5. GOMFHRENA, L. GLOBE AMARANTH. Fls. 3-bracted. Cal. 5- 

 sepalled, erect. Fil. 5, 3-cleft at apex, middle tooth bearing the 1-celled 

 anth. Stig. capitate. Fr. as in Iresine. Tropical plants. Lvs. opposite 

 Flowers in heads. 



G. GLOBOSA. Trichotomously much branched ; leaves oblong, entire ; flowers fadeless 

 bright purple, in heads 1' diameter. E. India. 1 2f. 



6. TELANTHERA, Br. Fls. 3-bracted. Cal. of 5 sepals. Stamens 5, 



