298 CHENOPOUIACE,E. 



2. ATRIPLEX. Linn. Orach. 

 (From the Greek a, not, and Tpafaiv, to nourish.) 

 Flowers monoecious or dioecious, rarely perfect. STERIES FL. 

 without bracts. Perianth 3 5-parted, without appendages. 

 Stamens 3 5. FERTILE FL. with 2 bracts at base. Perianth 

 none. Styles 2, united below. Utricle compressed, partly 

 included in the bracts, 1 -seeded. 



1. A. Halimus Linn. : stem frutescent; leaves alternate or opposite, ob- 

 long-subrhomboid, entire, decurrent into the petiole. 



N. J. to Virg. Tj. Muhl. A doubtful species. Shrubby Orach. 



2. A. patula Linn.: stem herbaceous, much branched, procumbent; 

 leaves triangular-hastate, acuminate, smooth above, irregularly toothed ; 

 the upper ones entire; perianth of the fruit submuricate on the sides. 

 A. Laciniata Pursh. 



N. Y. to Car. Aug. (T). Stem much branched ; the branches 1 2 feet long, 

 striate. Leaves on petioles which are nearly an inch long. Flowers clustered 

 on axillary and terminal spikes. Spreading Orach, 



3. A arenaria Nutt. : stem herbaceous, spreading ; leaves ohkmg-ovate, 

 subsessile, silvery-mealy beneath, rery entire ; upper ones acute or acumi- 

 nate; perianth of the fruit muricate, dentate, retuse. Obione arenaria 

 Moq- Tand. 



Sea-coast. N. Y. to Car. Aug., Sept. (T).Stem a foot high, angular, much 

 branched. Lower leaves often cuneate. Flowers monoecious; the sterile ones 

 in short glomerate spikes at the end of tlie branches ; the fertile ones in axillary 

 clusters. Sea-beach Orach. 



4. A. hortensis Linn. : stem rect, herbaceous ; leaves triangular, dentate, 

 green on both sides ; perianth of the fruit ovate, reticulate, entire ; flowers 

 in terminal interrupted racemes or spikes. 



Cultivated grounds. N. S. ; rare. July. (IX Stem 3 4 feet high. Leaves 

 2 3 inches long. Flowers green. Introduced. Garden Orach. 



3. ACNIDA. Linn. Water Hemp. 



(From the Greek a, wilhout, and KviSn., a nettle; because it resembles a nettle 

 but does not sting.) 



Flowers dioecious, without bracts, STERILE FL. Perianth 

 5-parted. Stamens 5, very short. FERTILE FL. Perianth 3- 

 parted. Styles none. Stigmas 3 5, spreading. Capsule 1- 

 seeded. 



1 . A. cannabina Linn. : leaves ovate-lanceolate ; capsules smooth, acutely 

 angled. 



Marshes. Can. to Flor. July, Aug. (1) Stem 3 6 feet high, slightly an- 

 gled. Leaves alternate, ribbed, 25 inches long, peti^led. Flowers small, green, 

 in large axillary and terminal panicles. Common Water Hemp. 



2. A. ruscocarpa Mich. : leaves oval-lanceolate ; capsules obtusely an- 

 gled, rugose. 



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