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Published In: Botaniska Notiser 1928: 206. 1928. (Bot. Not.) Name publication detail
 

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native

 

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11. Chenopodium missouriense Aellen

C. album L. var. missouriense Bassett & Crompton

Pl. 355 f, g; Map 1531

Plants annual, without an odor. Stems 20–150 cm long, erect or ascending, usually few- to several-branched above the base and below the inflorescence, glabrous or more commonly sparsely to moderately white-mealy, sometimes reddish-tinged or reddish purple–striped, almost always reddish purple at each node (on the side to which the leaf is attached). Leaves mostly long-petiolate. Leaf blades 1–6 cm long, mostly 1–3 times as long as wide (1–4 cm wide), usually 1.2–1.5 times in the largest (lowermost) leaves, ovate-rhombic or ovate-triangular, the uppermost usually linear to narrowly lanceolate, angled or tapered to a rounded or more commonly bluntly to sharply pointed tip, the middle lobe not appearing unusually elongate, broadly angled at the base, green or reddish-tinged, thin and herbaceous to thickened, somewhat leathery, and slightly succulent in texture, the margins entire to wavy or irregularly and often relatively coarsely several-toothed (the basal pair of teeth sometimes larger than the others, sometimes appearing shallowly lobed), the upper surface glabrous or sparsely to moderately mealy at maturity, not shiny, the undersurface sparsely to moderately white-mealy. Venation noticeably branched, with 1 or 3 main veins. Inflorescences axillary and terminal, consisting of short spikes with often well-separated small clusters of flowers, the terminal ones usually grouped into small to relatively large panicles. Flowers all maturing at more or less the same time. Calyx 5-lobed nearly to the base, usually covering the entire fruit except sometimes for a minute area surrounding the style, occasionally somewhat spreading in a few flowers of a given inflorescence, the lobes 0.7–1.0 mm long, ovate to triangular-ovate, bluntly pointed at the tip, usually with a sometimes poorly developed narrow keel or raised area along the midvein dorsally, sparsely to moderately white-mealy. Stamens 5. Stigmas 2. Fruits 0.9–1.1(–1.2) mm wide, depressed-ovoid, the seeds positioned horizontally, the wall thin, membranous, and somewhat translucent, smooth or finely roughened, not appearing honeycombed, sometimes difficult to separate from the seed. Seeds black, shiny, smooth or nearly so, rounded to very bluntly angled along the rim. 2n=54. September–October.

Scattered nearly throughout the state (eastern U.S. west to North Dakota and Texas; introduced farther west to California and Alaska; Canada). Banks of streams, rivers, spring branches, and sloughs, less commonly in bottomland forests and mesic upland forests; also crop fields, fallow fields, roadsides, railroads, and open, disturbed areas.

The inflorescences of C. missouriense tend to be more open and have more spreading, relatively slender branches than those of C. album. Relatively synchronous autumnal flowering and small fruits also are characteristic of C. missouriense. The reddish patches at the stem nodes occasionally are poorly developed.

 


 

 
 
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