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rillscale, thickleaf orache

Habit Herbs annual, monoecious, 3–15 dm, sparsely farinose, becoming green and glabrous.
Stems

erect, sometimes decumbent, branched, ribbed and striate.

Leaves

alternate above; opposite at least below;

blades lanceolate to linear-lanceolate; lower leaves triangular-ovate or ovate-hastate, 2–10 × 1–5(6.5) cm, green on both surfaces, red to yellowish at base; thick to succulent, bases broadly cuneate to truncate;

margins entire or minutely dentate or wavy;

tips acute or obtuse, green to somewhat red;

surfaces glabrous to sparsely scaly;

petioles 0–2(3) cm; upper leaves often sessile.

Inflorescences

clusters of short; axillary or terminal spikes; leafless except at base, staminate and pistillate flowers usually intermixed.

Staminate flowers

perianths 5-parted.

Pistillate flowers

perianths absent, enclosed by 2 fruiting bracteoles.

Seeds

dimorphic, 1–2 mm; black; shiny or 1.8–3 mm, brown.

Fruiting bracteoles

broadly triangular-hastate to ovate, inflated and spongy;

margins few-toothed;

tips acute;

faces smooth or with 2 tubercles, sessile.

2n

=36, 54.

Atriplex semibaccata

Atriplex dioica

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Seasonally moist ground, coastal beaches, riverbanks, roadsides, ditches. Flowering Jul–Oct. 0–100 m. Col, Est, WV. CA, ID, NV, WA; throughout Canada and most of US. Native.

Source Flora of Oregon, volume 2, page 69
Bridget Chipman
Sibling taxa
A. argentea, A. canescens, A. confertifolia, A. dioica, A. gardneri, A. gmelinii, A. hortensis, A. hymenelytra, A. micrantha, A. patula, A. powellii, A. prostrata, A. pusilla, A. rosea, A. truncata
A. argentea, A. canescens, A. confertifolia, A. gardneri, A. gmelinii, A. hortensis, A. hymenelytra, A. micrantha, A. patula, A. powellii, A. prostrata, A. pusilla, A. rosea, A. truncata
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