Atriplex hortensis

Linnaeus

Sp. Pl. 2: 1053. 1753.

Common names: Garden orach
IntroducedIllustrated
Synonyms: Atriplex nitens Schkuhr
Treatment appears in FNA Volume 4. Treatment on page 332. Mentioned on page 322, 323.

Herbs, green to yellowish or reddish, 5–15 (–25) dm, glabrous. Stems erect, mostly branched. Leaves mostly opposite or mostly alternate; petiole 0.3–4+ cm; blade green on both sides, ovate or ovatelanceolate to cordate-hastate at base, 15–180 × 8–135 mm, margin entire or more rarely irregularly toothed or lobed, apex attenuate to acuminate or rounded. Inflorescences of spikes disposed in leafless panicles. Staminate flowers 5-merous. Pistillate flowers dimorphic, some ebracteolate and with 5-parted perianth, others without perianth enclosed by a pair of sessile or very shortly stipitate bracteoles. Fruiting bracteoles samaralike, orbicular to oval or ovate, compressed, 5–18 mm, united only at base, entire, faces smooth. Seeds of ebracteate flowers black, horizontal, convex, 1–2 mm wide, lustrous; those of bracteolate flowers olivaceous brown, vertical, flat, 3–4.5 mm wide, dull. 2n = 18.


Phenology: Flowering summer–fall.
Habitat: Roadsides, canal and stream banks, lake shores, disturbed sites and gardens
Elevation: 0-2200 m

Distribution

V4 627-distribution-map.gif

Introduced; Alta., B.C., Man., Ont., Que., Sask., Yukon, Alaska, Calif., Colo., Conn., Idaho, Ill., Ind., Iowa, Mass., Minn., Mont., Nebr., Nev., N.J., N.Y., N.Dak., Oreg., S.Dak., Utah, Wash., Wis., Wyo., Asia

Discussion

Atriplex hortensis has been widely grown as a potherb, has escaped from cultivation, and is now established especially in moist ruderal sites. It is easily distinguished by its rounded, samaralike, entire, and smooth fruiting bracteoles, and the presence of two kinds of pistillate flowers, the one enclosed by bracteoles and lacking sepals, the other without bracteoles but subtended by sepals.

Atriplex nitens (see list of excluded taxa) is distinguished from A. hortensis in Flora Europea (P. Aellen 1964b) by having leaf blades densely white scurfy beneath, the distal surface lustrous, as opposed to green and dull for A. hortensis. Occasional specimens, treated here as A. hortensis, have leaves somewhat scurfy.

Selected References

None.

Lower Taxa

None.
... more about "Atriplex hortensis"
Stanley L. Welsh +
Linnaeus +
slippery +
aromatic +
compressed +, orbicular +  and oval or ovate +
0.5 cm5 mm <br />0.005 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (18 cm180 mm <br />0.18 m <br />) +
ovatelanceolate +  and cordate-hastate +
8mm;135mm +
persistent +  and deciduous +
stipitate +  and sessile +
reddish-brown +, black +, brown +  and green +
ovate +  and orbicular +
3-5-parted +
Garden orach +
Alta. +, B.C. +, Man. +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Calif. +, Colo. +, Conn. +, Idaho +, Ill. +, Ind. +, Iowa +, Mass. +, Minn. +, Mont. +, Nebr. +, Nev. +, N.J. +, N.Y. +, N.Dak. +, Oreg. +, S.Dak. +, Utah +, Wash. +, Wis. +, Wyo. +  and Asia +
0-2200 m +
tuberculate +  and smooth +
bracteolate +, ebracteate +, ebracteolate +, pistillate +, 5-merous +  and staminate +
unisexual +  and bisexual +
olivaceous brown +  and black +
vertical +  and horizontal +
dull +  and lustrous +
0.3 cm3 mm <br />0.003 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
not +  and connate +
enlarged +
Roadsides, canal and stream banks, lake shores, disturbed sites and gardens +
bladderlike +
terminal +  and axillary +
alternate +  and opposite +
deciduous +  and persistent +
not winged +  and winged +
lobed +  and toothed +
inferior +, half-inferior +  and superior +
crassinucellate +  and bitegmic +
campylotropous +
1 +  and single +
persistent +  and deciduous +
papery +  and chartaceous +
0.3 cm3 mm <br />0.003 m <br /> (4 cm40 mm <br />0.04 m <br />) +
Flowering summer–fall. +
bulbous +  and taprooted +
fusiform +
fleshy +  and fibrous +
verrucate +  and striate +
erect +, vertical +  and horizontal +
flattened +
Introduced +  and Illustrated +
cylindric +
3 (?) +  and 5 (?) +
opposite +  and alternate +
succulent +
sessile +  and petiolate +
reduced;small +
horizontal +  and vertical +
verrucate +
Atriplex nitens +
Atriplex hortensis +
Atriplex sect. Atriplex +
species +
dicotyledonous +
green +  and yellowish or reddish +